Ritmo circadiano y presión arterial en pacientes con monitorización ambulatoria de la presión arterial y su relación con el riesgo de evento cardiovascular / Circadian rhythm and blood pressure in patients with ambulatory blood pressure monitoring and its relationship with the risk of cardiovascular events

Introducción: Las enfermedades cardiovasculares son el conjunto de afecciones que más muertes produce globalmente, siendo la hipertensión arterial uno de los principales factores de riesgo. En este sentido, la monitorización de la presión arterial ambulatoria (MAPA) permite detectar los diferentes cambios de presión arterial a lo largo de 24h, denominados patrones circadianos: dipper, no dipper,riser o dipper extremo. Existe una posible asociación entre los diferentes patrones y el riesgo cardiovascular. En este estudio se pretende comparar el riesgo cardiovascular usando las escalas validadas REGICOR y SCORE en los pacientes con diferentes patrones circadianos usando la MAPA. Material y métodos: Estudio retrospectivo de pacientes hipertensos con registro MAPA entre 2015 y 2021 en Alcázar de San Juan y Madridejos. Se recogieron variables sociodemográficas, clínicas, antecedentes (hipertensión arterial, IMC, comorbilidades, hábitos de tabaquismo), analíticas, escalas REGICOR y SCORE, y ritmos circadianos. Resultados: Se han incluido un total de 269 pacientes (el 46,5% mujeres, 64,3±12,6 años), de los cuales un 38,3% presentaron patrón dipper, 10% dipper extremo, 33,1% no dipper y un 18,6% riser. Los pacientes con patrón riser tuvieron una puntuación significativamente mayor en las escalas REGICOR y SCORE (34 y 68%, respectivamente). Se observó una correlación significativa entre ambas escalas (rho Spearman: 0,589; p<0,001), aunque con baja concordancia (kappa de 0,348 [IC 95% 0,271-0,425]).Conclusión: La MAPA se ha convertido en una herramienta útil en el diagnóstico y tratamiento de la hipertensión arterial. Adicionalmente, conocer los patrones circadianos de estos pacientes podría favorecer el seguimiento y la elección del tratamiento adecuado.(AU)

Introduction: Cardiovascular diseases are the group of diseases that cause most deaths worldwide, being arterial hypertension the modifiable risk factor that mostly predisposes to other cardiovascular diseases development. In this regard, ambulatory blood pressure monitoring (ABPM) lets to detect the different changes in blood pressure throughout 24h, known as circadian patterns (dipper, non-dipper, riser or extreme dipper). There may be an association between these patterns and cardiovascular risk, so this study aims to compare cardiovascular risk using the 2 validated scales REGICOR and SCORE in patients with different circadian patterns using ABMP. Material and methods: Retrospective study of hypertensive patients with ABMP registered between 2015 and 2021 in Alcázar de San Juan and Madridejos. Data were collected from clinical history (arterial hypertension, BMI, comorbidities, and smoking habits) and ABPM records, as well as sociodemographic and analytical variables, cardiovascular risk scales (REGICOR and SCORE) and circadian rhythm variables (dipper, extreme dipper, non-dipper and rise pattern). Results: Two hundred and sixty-nine patients (46.5% female, 64.3±12.6 years old) were included. There were 38.3% with dipper pattern, 10% extreme dipper, 33.1% non-dipper and 18.6% riser. Patients with riser pattern showed higher score on the REGICOR and SCORE scales (34 and 68%, respectively). A significant correlation was established between both scales (Spearman rho: 0.589; p<0.001), but with poor concordance (kappa=0.348 [95% CI 0.271–0.425]). Conclusion: ABMP has turned into a very useful tool in the diagnosis and treatment of arterial hypertension. In addition, the circadian patterns of these patients may correlate to the choice of an adequate treatment and correct follow-up.(AU)

[Circadian rhythm and blood pressure in patients with ambulatory blood pressure monitoring and its relationship with the risk of cardiovascular events]. / Ritmo circadiano y presión arterial en pacientes con monitorización ambulatoria de la presión arterial y su relación con el riesgo de evento cardiovascular.

INTRODUCTION: Cardiovascular diseases are the group of diseases that cause most deaths worldwide, being arterial hypertension the modifiable risk factor that mostly predisposes to other cardiovascular diseases development. In this regard, ambulatory blood pressure monitoring (ABPM) lets to detect the different changes in blood pressure throughout 24h, known as circadian patterns (dipper, non-dipper, riser or extreme dipper). There may be an association between these patterns and cardiovascular risk, so this study aims to compare cardiovascular risk using the 2 validated scales REGICOR and SCORE in patients with different circadian patterns using ABMP. MATERIAL AND METHODS: Retrospective study of hypertensive patients with ABMP registered between 2015 and 2021 in Alcázar de San Juan and Madridejos. Data were collected from clinical history (arterial hypertension, BMI, comorbidities, and smoking habits) and ABPM records, as well as sociodemographic and analytical variables, cardiovascular risk scales (REGICOR and SCORE) and circadian rhythm variables (dipper, extreme dipper, non-dipper and rise pattern). RESULTS: Two hundred and sixty-nine patients (46.5% female, 64.3±12.6 years old) were included. There were 38.3% with dipper pattern, 10% extreme dipper, 33.1% non-dipper and 18.6% riser. Patients with riser pattern showed higher score on the REGICOR and SCORE scales (34 and 68%, respectively). A significant correlation was established between both scales (Spearman rho: 0.589; p<0.001), but with poor concordance (kappa=0.348 [95% CI 0.271-0.425]). CONCLUSION: ABMP has turned into a very useful tool in the diagnosis and treatment of arterial hypertension. In addition, the circadian patterns of these patients may correlate to the choice of an adequate treatment and correct follow-up.

Cardiovascular rhythmicity in overweight and obese children / Ritmicidade cardiovascular em crianças com sobrepeso e obesidade

Abstract Introduction: Obesity is thought to play a role in the disruption of cardiac rhythmicity in obese children, but this is mostly an unexplored field of investigation. We aimed to evaluate the impact of overweight and obesity on circadian and ultradian cardiovascular rhythmicity of prepubertal children, in comparison with normal weight counterparts. Methods: We performed a cross sectional study of 316 children, followed in the birth cohort Generation XXI (Portugal). Anthropometrics and 24-hour ambulatory blood pressure were measured and profiles were examined with Fourier analysis for circadian and ultradian blood pressure (BP) and heart rate (HR) rhythms. Results: Overweight/obese children presented more frequently a non-dipping BP pattern than normal weight counterparts (31.5% vs. 21.6%, p = 0.047). The prevalence of 24-hour mean arterial pressure (MAP) and 8-hour HR rhythmicity was significantly lower in obese children (79.3% vs. 88.0%, p = 0.038 and 33.3% vs. 45.2%, p = 0.031, respectively). The prevalence of the remaining MAP and HR rhythmicity was similar in both groups. No differences were found in the median values of amplitudes and acrophases of MAP and HR rhythms. Discussion: The alterations found in rhythmicity suggest that circadian and ultradian rhythmicity analysis might be sensitive in detecting early cardiovascular dysregulations, but future studies are needed to reinforce our findings and to better understand their long-term implications.

Resumo Introdução: Acredita-se que a obesidade desempenhe um papel na desregulação da ritmicidade cardíaca em crianças obesas, mas esse é um campo de investigação ainda pouco explorado. O objetivo deste trabalho foi avaliar o impacto do sobrepeso e da obesidade na ritmicidade cardiovascular circadiana e ultradiana de crianças pré-púberes, em comparação com crianças com peso normal. Métodos: Realizamos um estudo transversal com 316 crianças, acompanhadas na coorte de nascimentos Geração XXI (Portugal). Foram medidos dados antropométricos e a pressão arterial ambulatorial de 24 horas, e os perfis foram examinados com uma análise de Fourier para ritmos circadianos e ultradianos de pressão arterial (PA) e frequência cardíaca (FC). Resultados: Crianças com sobrepeso/obesidade apresentaram mais frequentemente um padrão de PA não-dipper em comparação com crianças com peso normal (31,5% vs. 21,6%; p = 0,047). A prevalência da pressão arterial média (PAM) de 24 horas e da ritmicidade da FC de 8 horas foi significativamente menor em crianças obesas (79,3% vs. 88,0%; p = 0,038 e 33,3% vs. 45,2%; p = 0,031, respectivamente). A prevalência das restantes ritmicidades da PAM e da FC foi semelhante em ambos os grupos. Não foram encontradas diferenças nos valores medianos das amplitudes e acrofases dos ritmos de PAM e FC. Discussão: As alterações encontradas na ritmicidade sugerem que a análise da ritmicidade circadiana e ultradiana pode ser sensível na detecção de desregulações cardiovasculares precoces, mas são necessários novos estudos para reforçar nossos achados e entender melhor suas implicações a longo prazo.

Sleep patterns in childhood: a longitudinal assessment from the Generation XXI birth cohort.

OBJECTIVE: To describe sleep-wake patterns in young children, based on sleep characteristics in early infancy and preschool ages, identifying their main sociodemographic characteristics, and to assess the association between different sleep characteristics at both ages. METHOD: We included 1092 children from the Generation XXI birth cohort, evaluated at six months and four years of age, by face-to-face interviews. Sleep patterns were constructed through latent class analysis and structured equation modeling, including data on wake-up time and bedtime, afternoon naps, locale of nighttime sleep and night awakenings. To estimate the association between sociodemographic characteristics and sleep patterns, odds ratios and 95% confidence intervals were computed using logistic regression. RESULTS: Two sleep patterns were identified through latent class analysis: pattern 1 was characterized by earlier bedtime and wake-up times, while pattern 2 was defined by later times. When compared with pattern 1, pattern 2 was more frequent among children whose mothers had changed from partnered to not partnered until preschool age and those who did not stay at the kindergarten, and was less common among those with siblings. Through structured equation modeling, an aggregating factor was identified at preschool age, which was mainly correlated with bedtime and wake-up time. A positive association between sleep characteristics evaluated in early infancy and in preschool ages was observed. CONCLUSIONS: Sleep patterns and circadian sleep preferences seem to be developed early in life, which highlight the importance of promoting an adequate sleep hygiene from infancy, assuming its impact on sleep quality during the life course.

Sleep in the human aging process and circadian sleep rhythm disruptions / Sono no processo de envelhecimento humano e interrupções do ritmo circadiano do sono

The aging process is often related to sleeping difficulties, often due to changes in circadian rhythms. The circadian timing system is centered in the suprachiasmatic nucleus - the master biological clock - which synchronizes the rhythm of oscillators throughout the body, including the sleep-wake cycle. This affects the time, duration and quality of sleep according to the development and aging process, under external and internal influences. This review addresses the human circadian timing system, including endogenous and exogenous influences on circadian rhythms, their age-related particularities, as well as the repercussions of circadian misalignment in neurodegenerative diseases. Circadian rhythms naturally weaken with aging, but there are particularities according to age. Throughout life, sleep and circadian rhythm disorders are strongly bidirectionally related to the pathophysiology of some psychiatric and neurodegenerative diseases, such as Alzheimer's and Parkinson's diseases. This knowledge could potentially create valuable opportunities to improve the health of the world's population that is under circadian misalignment and aging.

O processo de envelhecimento está frequentemente relacionado a dificuldades de dormir, muitas vezes decorrentes de alterações nos ritmos circadianos. O sistema de ronometragem circadiana está centrada no núcleo supraquiasmático - o relógio biológico mestre - o qual sincroniza o ritmo dos osciladores em todo o corpo, incluindo o ciclo sono-vigília. Isso afeta o tempo, a duração e a qualidade do sono de acordo com o processo de desenvolvimento e envelhecimento, sob influências externas e internas. Esta revisão aborda o sistema de temporização circadiana humana, incluindo as influências endógenas e exógenas nos ritmos circadianos, suas particularidades relacionadas à idade, bem como as repercussões do desalinhamento circadiano nas doenças neurodegenerativas. Os ritmos circadianos enfraquecem naturalmente com o envelhecimento, mas há particularidades de acordo com a idade. Ao longo da vida, os transtornos do sono e do ritmo circadiano estão fortemente relacionados bidirecionalmente à fisiopatologia de algumas doenças psiquiátricas e neurodegenerativas, como as doenças de Alzheimer e Parkinson. Esse conhecimento pode potencialmente criar oportunidades valiosas para melhorar a saúde da população mundial que está sob desalinhamento circadiano e envelhecimento.

Sleep patterns in childhood: a longitudinal assessment from the Generation XXI birth cohort / Patrones de sueño en la infancia: evaluación longitudinal de la cohorte de nacimiento Generación XXI

Objective: To describe sleep-wake patterns in young children, based on sleep characteristics in early infancy and preschool ages, identifying their main sociodemographic characteristics, and to assess the association between different sleep characteristics at both ages. Method: We included 1092 children from the Generation XXI birth cohort, evaluated at six months and four years of age, by face-to-face interviews. Sleep patterns were constructed through latent class analysis and structured equation modeling, including data on wake-up time and bedtime, afternoon naps, locale of nighttime sleep and night awakenings. To estimate the association between sociodemographic characteristics and sleep patterns, odds ratios and 95% confidence intervals were computed using logistic regression. Results: Two sleep patterns were identified through latent class analysis: pattern 1 was characterized by earlier bedtime and wake-up times, while pattern 2 was defined by later times. When compared with pattern 1, pattern 2 was more frequent among children whose mothers had changed from partnered to not partnered until preschool age and those who did not stay at the kindergarten, and was less common among those with siblings. Through structured equation modeling, an aggregating factor was identified at preschool age, which was mainly correlated with bedtime and wake-up time. A positive association between sleep characteristics evaluated in early infancy and in preschool ages was observed. Conclusions: Sleep patterns and circadian sleep preferences seem to be developed early in life, which highlight the importance of promoting an adequate sleep hygiene from infancy, assuming its impact on sleep quality during the life course. (AU)

Objetivo: Describir los patrones de sueño en niños, a partir de las características del sueño en la primera infancia y preescolar, identificando sus características sociodemográficas, y evaluar la asociación entre las características del sueño en ambas edades. Método: Se incluyeron 1092 niños de la cohorte Generación XXI, evaluados a los 6 meses y los 4 años de edad, mediante entrevistas en persona. Los patrones de sueño se identificaron mediante análisis de clases latentes y modelos de ecuaciones estructuradas, utilizando datos sobre la hora de despertarse y acostarse, las siestas de la tarde, el lugar del sueño nocturno y los despertares nocturnos. Para estimar la asociación entre las características sociodemográficas y los patrones de sueño se calcularon odds ratio con intervalos de confianza del 95% mediante regresión logística. Resultados: Se identificaron dos patrones de sueño: el patrón 1 se caracterizó por acostarse y levantarse más temprano; el patrón 2, por tiempos más tardíos. El patrón 2 fue más frecuente entre los niños con madres que cambiaron de pareja a no pareja y que no permanecieron en el jardín de infancia, y menos común entre aquellos con hermanos. Se identificó un factor agregante en la edad preescolar, correlacionado con la hora de acostarse y despertarse. Se observó una asociación positiva entre las características del sueño evaluadas en la primera infancia y en edades preescolares. Conclusiones: Los patrones del sueño parecen desarrollarse temprano en la vida, lo que destaca la importancia de promover una adecuada higiene del sueño desde la infancia. (AU)

Alteraciones del sueño y demencia en población mayor. Revisión sistemática / Sleep disturbances and dementia in the elderly population. Systematic review

Introducción: La demencia en la persona mayor es uno de los factores que más disminuye la calidad de vida, junto a las comorbilidades que conlleva, como las alteraciones del sueño. Sin embargo, numerosos estudios apuntan a una bidireccionalidad causal entre estos 2 factores. El objetivo del trabajo consiste en elaborar una revisión sistemática de las bases de datos disponibles acerca de la relación entre alteraciones en el sueño y la demencia. Metodología: Las fuentes de búsqueda fueron PubMed, Scopus y Cochrane. Se siguió la estrategia de búsqueda “((Dementia) OR (“Alzheimer Disease”)) AND ((“Sleep Wake Disorders”) OR (circadia*) OR (“sleep disorders, intrinsic”) OR (“Sleep Disorders”) OR (“Circadian Rhythm”) OR (“Circadian Clocks”) OR (“sleep disorders, circadian rhythm”) OR (“circadian dysregulation”))”, se atendieron a los criterios de inclusión/ exclusión y se extrajeron 35 artículos. Resultados: La bibliografía revisada sustenta la relación de retroalimentación entre las alteraciones del sueño y la demencia. El beta-amiloide, característico de las placas y ovillos neurofibrilares en la enfermedad del Alzheimer, aumenta tras la privación de sueño, lo que, a su vez, suele generar acúmulo en el núcleo supraquiasmático, principal regulador del ciclo sueño-vigilia y de los ritmos circadianos. Conclusiones: Las alteraciones del sueño son posibles predictores de la enfermedad del Alzheimer y, en su mayor parte, son un factor modificable de la gravedad y tiempo de inicio de la patología. Ambos se interrelacionan en una sinergia mutua (AU)

Introduction: Dementia in the elderly is one of the factors that most reduces the quality of life, together with the comorbidities that it entails, such as sleep disturbances. However, numerous studies point to a causal bidirectionality between these two factors. The aim of the study is to elaborate a systematic review of the available data base on the relationship between sleep disturbances and dementia. Methodology: The search sources were PubMed, Scopus and Cochrane, following the search strategy “((Dementia) OR (“ Alzheimer Disease “)) AND ((“ Sleep Wake Disorders“) OR (circadia *) OR (“ sleep disorders, intrinsic “) OR (“ Sleep Disorders “) OR (“Circadian Rhythm”) OR (“Circadian Clocks”) OR (“sleep disorders, circadian rhythm”) OR (“circadian dysregulation”))”and according to the inclusion / exclusion criteria, 35 articles were extracted. Results: The literature reviewed supports the feedback relationship between sleep disturbances and dementia. Amyloid-beta, characteristic of neurofibrillary plaques and tangles in Alzheimer disease, increases after sleep deprivation. Its accumulation is usually generated in the suprachiasmatic nucleus, the main regulator of the sleep-wake cycle and circadian rhythms. Conclusions: Sleep disturbances are possible predictors of AD and, for the most part, a modifiable factor of the severity and time of onset of the pathology. Both are interrelated in a mutual synergy (AU)

Impacto de un curso electivo sobre ritmo circadiano y salud / Impact on an elective course on circadian rhythm and health

Fundamento: el análisis del impacto de la gestión docente es un requerimiento de la responsabilidad social universitaria. Objetivo: analizar el impacto del curso electivo Ritmo Circadiano y Salud, a través de la apreciación de los estudiantes, en la Facultad de Ciencias Médicas "Salvador Allende", durante el curso 2022-2023. Métodos: se desarrolló una investigación descriptiva, no experimental, con enfoque cualitativo, aplicando la metodología del estudio de caso. Se utilizaron métodos teóricos: análisis-síntesis e inducción-deducción, y empíricos: revisión documental y entrevista grupal a estudiantes. Resultados: de manera unánime se manifestó por los estudiantes la adquisición de conocimientos nuevos, de importancia para la práctica profesional, mediante el asesoramiento en el procesamiento de información, para la participación en una actividad virtual no conocida, así como la posibilidad de vivenciar en su entorno una problemática de salud asociada al tema del curso. Conclusiones: la apreciación por los estudiantes participantes del curso electivo Ritmo Circadiano y Salud, indicó un impacto positivo desde los puntos de vista cognitivo, educativo y social.

Background: the analysis of the impact of teaching management is a requirement of university social responsibility. Objective: to analyze the impact of the elective course Circadian Rhythm and Health, through the appreciation of the students, in the "Salvador Allende" Faculty of Medical Sciences, during the 2022-2023 academic year. Method: a descriptive, non-experimental investigation was developed, with a qualitative approach, applying the case study methodology. Theoretical methods were used: analysis-synthesis and induction-deduction, and empirical ones: documentary review and group interview with students. Results: the students unanimously expressed the acquisition of new important knowledge for professional practice, through advice on information processing, for participation in an unknown virtual activity, as well as the possibility of experiencing in their environment a health problem associated with the topic of the course. Conclusions: the appreciation by the participating students of the elective course Circadian Rhythm and Health, indicated a positive impact from the cognitive, educational and social points of view.

Digital technology and its impacts on the sleep quality and academic performance during the pandemic / Tecnologias digitais e seus impactos na qualidade do sono e desempenho acadêmico em tempos de pandemia

Abstract Background Sleep deficits caused by the overuse of digital technology is observed among medical students. Due to the coronavirus disease 2019 (COVID-19) pandemic, an emergency remote teaching method was put into practice, which may have resulted in changes in the sleep-wake cycle. The balance between the influences of external and internal synchronizers can be affected by sudden alterations in daily life, including changes in nightly habits and sleep quality, which can lead to increased levels of anxiety and reduced functional performance, for example. Objective To understand the relationship between the use of digital technology, changes in the circadian cycle, and academic performance during the pandemic. Methods The present is an analytical, cross-sectional, observational study in which a sample of 123 medical students filled out an online questionnaire on self-perception regarding sleep quality and academic performance before and during the pandemic. Results Assessing changes in sleep quality and productivity, the study revealed that 100% of the students made continuous use of screens before bedtime. Thus, during the period of social distancing and remote classes, 77.2% of the students reported "poor" or "very poor academic performance, which was probably related to the fact that 65.9% of these students were unable to maintain their productivity due to daytime sleepiness. Conclusions The prolonged use of screens was associated with poor sleep quality and changes in academic performance, with significant psychological impact. Thus, it is worth emphasizing the importance of sleep hygiene in light of the new forms of teaching implemented during the COVID-19 pandemic.

Resumo Introdução Observa-se um déficit de sono ocasionado pelo uso excessivo de tecnologias digitais entre estudantes de medicina. Em face da pandemia da doença do coronavírus 2019 (coronavirus disease 2019, COVID-19, em inglês), um método de ensino à distância foi adotado, e pode ter acarretado mudanças no ciclo de sono e vigília. O equilíbrio entre as influências dos sincronizadores externos e internos pode ser afetado por mudanças bruscas na vida diária, isto inclui alterações nos hábitos noturnos e na qualidade do sono, que podem causar aumento dos níveis de ansiedade e redução do desempenho funcional. Objetivo Compreender a relação entre o uso de tecnologias digitais, alterações no ciclo circadiano, e desempenho acadêmico durante a pandemia. Métodos Trata-se de um estudo observacional, analítico e transversal, no qual uma amostra de 123 estudantes de medicina responderam a um questionário online sobre a autopercepção referente à qualidade do sono e ao desempenho acadêmico antes e durante a pandemia. Resultados Com a avaliação das alterações na qualidade do sono e na produtividade, o estudo revelou que 100% dos alunos faziam uso contínuo de telas antes do horário de dormir. Assim, durante o período de distanciamento social e aulas remotas, 77,2% dos alunos relataram que o desempenho acadêmico era "ruim" ou "péssimo", o que provavelmente estava relacionado ao fato de que 65,9% desses alunos que não conseguiram manter sua produtividade por conta de sonolência diurna. Conclusões O uso de telas por tempo prolongado foi associado a mudanças relacionadas à baixa qualidade do sono e a mudanças no desempenho acadêmico, com impacto psicológico significativo. Assim, vale ressaltar a importância da higiene do sono diante das novas formas de ensino implantadas durante a pandemia da COVID-19.

[Variability of the genetic marker CLOCK rs3749474 and its impact on research and clinical trials on obesity and circadian rhythm]. / Variabilidad del marcador genético CLOCK rs3749474 y su impacto en la investigación y ensayos clínicos sobre obesidad y ritmo circadiano.

Introduction: Introduction: circadian rhythms influence eating behavior, with the CLOCK gene being one of those responsible for its regulation. The rs3749474T/C of the CLOCK gene has been associated with an increased risk of obesity. Those who carry the T allele have greater weight loss on a diet low in carbohydrates and lipids than those who have the CC form. Methodology: using the 1000 Genomes database, the genotype of the single nucleotide polymorphism (SNP) rs3749474 was obtained from 2,504 individuals, covering five macro-populations (Africa, East Asia, South Asia, Europe and Latin America) and 26 populations. CT and TT were treated as non-risk genotypes and CC as risk. Fisher's exact test was used to compare the frequencies of risk and non-risk genotypes among the five macro populations. Results: there is a high differentiation for the frequency of genotypes carrying the T allele among the macro-populations: Africa reached only 31.47 %, Europe 56.86 %; Latin America 66.28 %; South Asia 68.3 % and East Asia 81.15 %, with significant differences (pFisher < 0.05) in all comparisons, except between Latin America and South Asia. Low heterogeneity was observed between populations within each macro population. Conclusions: the high heterogeneity for the genotypic frequencies of CLOCK rs3749474 in the studied macro-populations indicates that the decrease in the consumption of carbohydrates and lipids will have a heterogeneous impact, from the epidemiological point of view. This suggests including the genetic ancestry in later studies of association between circadian cycles, eating behavior and obesity, in order to develop personalized clinical tests.

Introducción: Introducción: los ritmos circadianos influyen en la conducta alimentaria, siendo el gen CLOCK uno de los encargados de su regulación. El rs3749474T/C del gen CLOCK ha sido asociado a un mayor riesgo de obesidad y quienes portan el alelo T presentan una mayor pérdida de peso ante una dieta baja en carbohidratos y lípidos que quienes poseen la forma CC. Material y métodos: usando la base de datos 1000 Genomes se obtuvo el genotipo del polimorfismo de nucleótido único (SNP) rs3749474 de 2.504 individuos, abarcando cinco macropoblaciones (África, Este Asiático, Sur Asiático, Europa y Latinoamérica) y 26 poblaciones. CT y TT fueron tratados como genotipos de no riesgo y CC, como de riesgo. Se utilizó la prueba exacta de Fisher para comparar las frecuencias de los genotipos de riesgo y no riesgo. Resultados: existe una alta diferenciación para la frecuencia de genotipos portadores del alelo T entre las macropoblaciones: África alcanzó solo el 31,47 %; Europa, un 56,86 %; Latinoamérica, un 66,28 %; el Sur Asiático, un 68,3 %; y el Este Asiático, un 81,15 %, con diferencias significativas (pFisher < 0,05) en todas las comparaciones, excepto entre Latinoamérica y Sur Asiático. Se observó una baja heterogeneidad entre poblaciones dentro de cada macropoblación. Conclusiones: la alta heterogeneidad para las frecuencias genotípicas de CLOCK rs3749474 en las macropoblaciones estudiadas indica que la disminución del consumo de carbohidratos y lípidos tendrá un impacto heterogéneo desde el punto de vista epidemiológico. Esto sugiere incluir la ancestría genética en posteriores estudios de asociación entre ciclos circadianos, conducta alimentaria y obesidad, con el objeto de desarrollar pruebas clínicas personalizadas.

Melatonin in sleep disorders.

Melatonin is the main hormone involved in the control of the sleep-wake cycle. It is easily synthesisable and can be administered orally, which has led to interest in its use as a treatment for insomnia. Moreover, as production of the hormone decreases with age, in inverse correlation with the frequency of poor sleep quality, it has been suggested that melatonin deficit is at least partly responsible for sleep disorders. Treating this age-related deficit would therefore appear to be a natural way of restoring sleep quality, which is lost as patients age. However, despite the undeniable theoretical appeal of this approach to insomnia, little scientific evidence is available that supports any benefit of this substitutive therapy. Furthermore, the most suitable dose ranges and pharmaceutical preparations for melatonin administration are yet to be clearly defined. This review addresses the physiology of melatonin, the different pharmaceutical preparations, and data on its clinical usefulness.

Variabilidad del marcador genético CLOCK rs3749474 y su impacto en investigaciones y pruebas clínicas sobre obesidad y ritmo circadiano / Variability of the genetic marker CLOCK rs3749474 and its impact on research and clinical trials on obesity and circadian rhythm

Introducción: los ritmos circadianos influyen en la conducta alimentaria, siendo el gen CLOCK uno de los encargados de su regulación. El rs3749474T/C del gen CLOCK ha sido asociado a un mayor riesgo de obesidad y quienes portan el alelo T presentan una mayor pérdida de peso ante una dieta baja en carbohidratos y lípidos que quienes poseen la forma CC. Material y métodos: usando la base de datos 1000 Genomes se obtuvo el genotipo del polimorfismo de nucleótido único (SNP) rs3749474 de 2.504 individuos, abarcando cinco macropoblaciones (África, Este Asiático, Sur Asiático, Europa y Latinoamérica) y 26 poblaciones. CT y TT fueron tratados como genotipos de no riesgo y CC, como de riesgo. Se utilizó la prueba exacta de Fisher para comparar las frecuencias de los genotipos de riesgo y no riesgo. Resultados: existe una alta diferenciación para la frecuencia de genotipos portadores del alelo T entre las macropoblaciones: África alcanzó solo el 31,47 %; Europa, un 56,86 %; Latinoamérica, un 66,28 %; el Sur Asiático, un 68,3 %; y el Este Asiático, un 81,15 %, con diferencias significativas (pFisher < 0,05) en todas las comparaciones, excepto entre Latinoamérica y Sur Asiático. Se observó una baja heterogeneidad entre poblaciones dentro de cada macropoblación. Conclusiones: la alta heterogeneidad para las frecuencias genotípicas de CLOCK rs3749474 en las macropoblaciones estudiadas indica que la disminución del consumo de carbohidratos y lípidos tendrá un impacto heterogéneo desde el punto de vista epidemiológico. Esto sugiere incluir la ancestría genética en posteriores estudios de asociación entre ciclos circadianos, conducta alimentaria y obesidad, con el objeto de desarrollar pruebas clínicas personalizadas. (AU)

Introduction: circadian rhythms influence eating behavior, with the CLOCK gene being one of those responsible for its regulation. The rs3749474T/C of the CLOCK gene has been associated with an increased risk of obesity. Those who carry the T allele have greater weight loss on a diet low in carbohydrates and lipids than those who have the CC form. Methodology: using the 1000 Genomes database, the genotype of the single nucleotide polymorphism (SNP) rs3749474 was obtained from 2,504 individuals, covering five macro-populations (Africa, East Asia, South Asia, Europe and Latin America) and 26 populations. CT and TT were treated as non-risk genotypes and CC as risk. Fisher's exact test was used to compare the frequencies of risk and non-risk genotypes among the five macro populations. Results: there is a high differentiation for the frequency of genotypes carrying the T allele among the macro-populations: Africa reached only 31.47 %, Europe 56.86 %; Latin America 66.28 %; South Asia 68.3 % and East Asia 81.15 %, with significant differences (pFisher < 0.05) in all comparisons, except between Latin America and South Asia. Low heterogeneity was observed between populations within each macro population. Conclusions: the high heterogeneity for the genotypic frequencies of CLOCK rs3749474 in the studied macro-populations indicates that the decrease in the consumption of carbohydrates and lipids will have a heterogeneous impact, from the epidemiological point of view. This suggests including the genetic ancestry in later studies of association between circadian cycles, eating behavior and obesity, in order to develop personalized clinical tests. (AU)

Melatonina en los trastornos de sueño / Melatonin in sleep disorders

La melatonina es la principal hormona implicada en la regulación de la oscilación entre sueño y vigilia. Es fácilmente sintetizable y administrable por vía oral, lo que ha propiciado el interés para usarla en el tratamiento de una de las patologías humanas más prevalentes, el insomnio. Además, el hecho de que su producción se reduzca con la edad, en una relación inversamente proporcional a la frecuencia de mala calidad de sueño, ha reforzado la idea de que su déficit es, al menos en parte, responsable de estos trastornos. En esta línea de pensamiento, remontar el déficit que se va instaurando a medida que transcurre la vida sería un modo natural de restaurar la integridad del sueño, que se va perdiendo con la edad. Sin embargo, a pesar del innegable atractivo teórico de esta aproximación al problema del insomnio, la evidencia científica que sustenta el posible beneficio de esta terapia sustitutiva es escasa. Ni siquiera están bien definidos los rangos de dosis a los que administrarla o la formulación farmacológica más adecuada. En la presente revisión se repasa la fisiología de la melatonina, se revisan las características farmacológicas de su administración exógena y se analizan los datos existentes sobre su utilidad clínica. (AU)

Melatonin is the main hormone involved in the control of the sleep-wake cycle. It is easily synthesisable and can be administered orally, which has led to interest in its use as a treatment for insomnia. Moreover, as production of the hormone decreases with age, in inverse correlation with the frequency of poor sleep quality, it has been suggested that melatonin deficit is at least partly responsible for sleep disorders. Treating this age-related deficit would therefore appear to be a natural way of restoring sleep quality, which is lost as patients age. However, despite the undeniable theoretical appeal of this approach to insomnia, little scientific evidence is available that supports any benefit of this substitutive therapy. Furthermore, the most suitable dose ranges and pharmaceutical preparations for melatonin administration are yet to be clearly defined. This review addresses the physiology of melatonin, the different pharmaceutical preparations, and data on its clinical usefulness. (AU)

Variaciones Diurnas de las Concentraciones de Cortisol Salival en Adultos Jóvenes Sanos

RESUMEN: Determinar las variaciones diurnas de las concentraciones de cortisol salival (CORTs) en adultos jóvenes sanos. Estudio descriptivo de corte transversal. Un total de 50 estudiantes universitarios, sin antecedentes de trastornos físicos o psiquiátricos, recogieron muestras de saliva completa no estimulada en sus hogares, por la mañana (6:30- 7:30 AM) y la tarde (4:00-6:00 PM). El CORTs se analizó utilizando inmunoensayo por quimioluminiscencia. El análisis estadístico de los resultados se realizó mediante la prueba t de Student y coeficiente de correlación de Pearson. El valor medio de CORTs de la mañana (0,29 ± 0,11 mg/dl) es significativamente más alto (t = 15,43, p < 0,0001) en comparación con la tarde (0,06 ± 0,03 mg/dl), con un coeficiente de variabilidad muy alto. La asimetría (As) y kurtosis (K) vespertinas (As=3,10; K=8,69) fueron mayores que las matutinas (As= 0,45; K= -1,07). Resultaron significativos los coeficientes entre CORTs-AM y CORTs-PM (r = 0,36, p = 0,0106), pero no entre CORTs edad, IMC y género. La variabilidad diaria, intra e interindividual, fue alta para todos los resultados de CORTs. Estos resultados facilitarán la interpretación de la variabilidad biológica del CORTS en salud y enfermedad.

ABSTRACT: To determine the diurnal variations of salivary cortisol (sCORT) concentrations in healthy young adults. Descriptive cross-sectional research design. A total of 50 university students, with no history of physical or psychiatric disorders, collected samples of unstimulated whole saliva at home, in the morning (6:30-7:30 AM) and in the afternoon (4:00-6:00 PM). The CORTs were analyzed using chemiluminescence immunoassay. Statistical analysis was performed using Student's t test and Pearson's correlation coefficient. The mean CORTs value in the morning (0,29 ± 0,11 mg/dl) is significantly higher (t = 15,43, p <0,0001) compared to the afternoon (0,06 ± 0,03 mg/dl), with a very high coefficient of variability. The asymmetry (As) and kurtosis (K) in the evening (As = 3,10; K = 8,69) were greater than in the morning (As = 0,45; K = -1,07). The coefficients between CORTs-AM and CORTs-PM were significant (r = 0,36, p = 0,0106), but not between CORTs with age, BMI and gender. Intra- and inter-individual daily variability was high for all CORTs results. These results will facilitate the interpretation of the biological variability of CORTS in health and disease.

Síndrome de retraso de la fase del sueño: una revisión bibliográfica / Delayed Sleep Phase Syndrome: A Literature Review

Resumen El síndrome de la fase retrasada del sueño (DSPS, por sus siglas en inglés: delayed sleep phase syndrome) es un trastorno del sueño neurológico en el que el ciclo sueño/vigilia de una persona se retrasa con respecto al ciclo día/noche externo. Consiste en un desfase, de etiología multifactorial, entre la hora de irse a dormir y la hora de despertar. Es una entidad patológica que afecta a todas las edades; sin embargo, ha ido en aumento en las personas jóvenes debido al creciente uso de dispositivos electrónicos emisores de luz azul, como celulares, computadoras, tablets, etc. El uso de estos dispositivos de longitud de onda corta (430-460 nm [luz azul]) estimulan las células ganglionares fotorreceptoras de la retina, induciendo a la producción y liberación de melanopsina. Esta última inhibe la síntesis y secreción de la melatonina, hormona inductora del sueño producida por la glándula pineal. La prevalencia de este síndrome no está bien documentada, ya que es una entidad infravalorada. Existen estudios que revelan que hasta el 16% de los jóvenes a nivel mundial lo padecen. Las consecuencias a corto y largo plazo del DSPS son: cefalea, somnolencia, fatiga, deterioro cognitivo, desregulaciones metabólicas, inmunológicas y predisposición a manifestar trastornos mentales como depresión, ansiedad y bipolaridad. Su diagnóstico se realiza siguiendo criterios previamente estandarizados y mediante el uso de herramientas subjetivas como la historia clínica y los registros del diario de sueño. El tratamiento se centra en medidas farmacológicas y no farmacológicas como son: el uso de melatonina, las terapias de modificación del comportamiento y el uso de dispositivos bloqueadores de ondas de luz cortas, entre otras. El objetivo del presente trabajo es hacer una revisión bibliográfica sobre el DSPS para conocer las características y emitir recomendaciones para disminuir el uso prolongado de equipos electrónicos emisores de luz azul.

Abstract The delayed sleep phase syndrome (DSPS) is a neurological dream disorder with a multifactorial etiology. It consists of a change between the time of going to sleep and the time of waking up, thus affecting the sleep-wake cycle. This disorder affects people of all ages, nevertheless it has increased in young people due to the use of blue-light emitting electronic devices, such as cell phones, computers, tablets, and others. The use of these short-length waves devices (430- 460 nm; blue light) stimulates the retina's photoreceptive ganglionic cells inducing the synthesis and secretion of melanopsin. This will inhibit eventually the production and secretion of melatonin, a sleep-inducing hormone produced by the pineal gland. The prevalence of this syndrome is not well known since it is an underestimated entity. Previous studies show that 16% of the young population worldwide, suffers from this clinical entity. The short and long-term consequences of DSPS are: headaches, somnolence, fatigue, cognitive decline, metabolic and immunologic dysregulation, as well as mental disorders such as anxiety, depression, and bipolarity disorder. Its diagnosis is made following standardized criteria and using subjective tools such as the medical history and a sleep diary. The treatment focuses on pharmacological and nopharmacological options, such as: melatonin administration, behavioral therapies, and short-length wave blocking devices. The aim of this study was to describe the characteristics of DSPS and emit recommendations to diminish the long-lasting use of blue light-emitting devices.

Influência do sono e da crononutrição na hipertensão e diabetes: um estudo de base populacional / Influence of sleep and chrononutrition on hypertension and diabetes: a population-based study / Influencia del sueño y de la crononutrición en la hipertensión y la diabetes: un estudio de base poblacional

O objetivo foi avaliar a influência do sono e da crononutrição na hipertensão e diabetes na população adulta (18 anos ou mais) em um município do Sul do Brasil. Trata-se de um estudo transversal de base populacional, desenvolvido em Criciúma, Santa Catarina, em 2019. As variáveis de exposição foram duração e qualidade do sono, e dois dos principais aspectos da crononutrição, o número de refeições diárias e a realização do café da manhã. Os desfechos estudados foram diabetes mellitus e hipertensão arterial sistêmica. Regressão de Poisson bruta e ajustada com variância robusta foi utilizada para avaliar as associações entre as exposições e os desfechos. Para todas as análises, considerou-se o efeito do desenho amostral, e o nível de significância utilizado foi de 5%. Foram estudados 820 indivíduos. As prevalências de diabetes e hipertensão foram 19,9% e 44,1%, respectivamente. Indivíduos com pior qualidade do sono tiveram prevalência 33% maior de diabetes e 17% maior de hipertensão, comparados àqueles com boa qualidade do sono. Os que realizaram quatro ou mais refeições ao dia apresentaram prevalência 16% menor de hipertensão quando comparados aos que fizeram menos de quatro refeições. Conclui-se que a qualidade do sono e o número de refeições diárias, um comportamento alimentar relacionado à crononutrição, estiveram relacionados à hipertensão e ao diabetes. Tais resultados destacam a importância de ações de saúde pública que abordem novas estratégias para o enfrentamento dessas doenças, voltadas à qualidade do sono e à crononutrição.

The objective is to evaluate the influence of sleep and chrononutrition on hypertension and diabetes in the adult population (18 years or older) in a municipality in Southern Brazil. This is a population-based cross-sectional study, developed in Criciúma, State of Santa Catarina, in 2019. The exposure variables were sleep duration and quality, and two of the main aspects of chrononutrition, the number of daily meals and the presence of breakfast. The outcomes studied were diabetes mellitus and systemic arterial hypertension. Crude and adjusted Poisson regression with robust variance was used to evaluate the associations between exposures and outcomes. For all analyses, the effect of the sample design was considered, and the significance level adopted was 5%. In total, 820 patients were evaluated. The prevalence of diabetes and hypertension was of 19.9% and 44.1%, respectively. Individuals with worse sleep quality had a higher prevalence of 33% for diabetes and 17% for hypertension, compared to those with good quality of sleep. Those who had four or more meals per day had a 16% lower prevalence of hypertension, when compared to those who had less than four meals. We concluded that the quality of sleep and the number of daily meals, a feeding behavior related to chrononutrition, were related to hypertension and diabetes. These results highlight the importance of public health actions that address new strategies for coping with these diseases focused on sleep quality and chrononutrition.

El objetivo fue evaluar la influencia del sueño y la crononutrición sobre la hipertensión arterial y la diabetes en la población adulta (18 años o más) en un municipio del Sur de Brasil. Se trata de un estudio transversal de base poblacional, desarrollado en Criciúma, Santa Catarina, en el 2019. Las variables de exposición fueron la duración y la calidad del sueño, y dos de los principales aspectos de la crononutrición, el número de comidas diarias y el consumo de desayuno. Los desenlaces estudiados fueron la diabetes mellitus e la hipertensión arterial sistémica. Se utilizó la regresión de Poisson cruda y ajustada con varianza robusta para evaluar las asociaciones entre las exposiciones y los desenlaces. Para todos los análisis, se consideró el efecto del diseño de la muestra y el nivel de significación utilizado fue del 5%. Se estudiaron 820 individuos. Las prevalencias de diabetes e hipertensión fueron de 19,9% y del 44,1%, respectivamente. Las personas con peor calidad del sueño tuvieron una prevalencia de diabetes un 33% mayor y una prevalencia de hipertensión un 17% mayor, en comparación con las personas con una buena calidad del sueño. Los que efectuaron cuatro o más comidas al día presentaron una prevalencia de hipertensión un 16% menor en comparación con los que efectuaron menos de cuatro comidas. Se concluye que la calidad del sueño y el número de comidas diarias, una conducta alimentaria relacionada con la crononutrición, están relacionados con la hipertensión arterial y la diabetes. Estos resultados destacan la importancia de acciones de salud pública que aborden nuevas estrategias de enfrentamiento a estas enfermedades, centradas en la calidad del sueño y en la crononutrición.

Bruxismo do sono e em vigília em adolescentes: prevalência, fatores associados e análise de caminhos / Sleep and awake bruxism in adolescents: prevalence, associated factors and pathways to occurrence

O Bruxismo é um comportamento, com atividade muscular mastigatória, que pode apresentar-se como bruxismo do sono (BS) e bruxismo em vigília (BV). Possui etiologia multifatorial, sendo pouco explorado entre adolescente. Essa tese é composta por dois artigos que avaliam a prevalência, fatores associados e análise de caminhos. O objetivo do artigo 1 (n=403) foi reconhecer os caminhos que influenciam a ocorrência de provável bruxismo do sono (PBS) e provável bruxismo em vigília (PBV) em adolescentes. O artigo 2 (n=342) objetivou avaliar a associação entre PBV e hábitos de morder, satisfação de vida, caracteristicas do sono e perfil cronotipo em adolescentes, por meio de um estudo caso-controle. Com aprovação do comitê de ética institucional, participaram do estudo adolescentes de 12 a 19 anos de idade, regularmente matriculados em escolas públicas e privadas de Belo Horizonte. Os pais/cuidadores responderam a um questionário sobre características do sono de seus filhos. Os adolescentes responderam aos seguintes instrumentos: questionário sobre hábitos de morder, características do sono e relato de bruxismo; a escala "The Circadian Energy Scale" (CIRENS), para mensurar o perfil cronotipo; e o dominio self da versão brasileira da Escala Multidimensional de Satisfação de Vida para Adolescentes (EMSVA). O PBS e PBV foram mensurados considerando o auto relato positivo, somado à presença de desgaste dentário por atrição aferido em exame clinico feito pela pesquisadora previamente calibrada. A análise descritiva foi incluida nos artigos 1 e 2. O artigo 1 usou a análise de caminhos, tecnica que descreve as dependências direcionadas entre um conjunto de variáveis. No artigo 2 foi feita regressão logistica condicional (OR) (p<0,05). Como resultados no artigo 1, verificou-se que 22,3% dos adolescentes apresentaram PBS e 51,1% PBV. As duas manifestações de bruxismo apresentaram associação entre si, com uma correlação moderada e positiva (ß= 0,390). Qualidade do sono e renda familiar tiveram um efeito direto sobre PBS (ß= - 0,138; ß=0,123; respectivamente) e em PBV (ß= - 0,155; ß=0,116; respectivamente), de modo que aqueles com maior renda e com má qualidade do sono tenderam a apresentar provável bruxismo tanto BS, quanto BV. Cronotipo teve efeito direto sobre o PBS, de modo que adolescentes com cronotipo matutino tenderam a ter o comportamento (ß= -0,102). Adolescentes que relataram babar no travesseiro enquanto dormiam (ß= 0,184) e/ou que tinham sono agitado (ß= 0,104) tenderam a apresentar PBS. Já no artgido 2 verificou-se que má qualidade do sono (OR=1,731, IC95% 1,054-2,842, p=0,030), hábito de morder objetos muitas vezes (OR=3,303, IC95% 1,631-6,690, p=0,001), hábito de morder ou apertar os lábios algumas vezes (OR=2,134, IC95% 1,230-3,702, p=0,007) e hábito de morder ou apertar os lábios muitas vezes nas duas semanas anteriores à avaliação (OR=2,355, IC95% 1,203- 4,608, p=0,012) foram associados à ocorrencia de PBV. Concluiu-se com o artigo 1 que o perfil cronotipo, renda familiar e caracteristicas do sono influenciaram no caminho percorrido pelo PBS, enquanto renda e qualidade do sono influenciam o PBV. Enquato atraves do artigo 2, concluiu- se que adolescentes com má qualidade do sono e que apresentam habitos de morder tiveram mais chance de apresentar PBV.

Bruxism is a behavior, with masticatory muscle activity, which can present itself as sleep bruxism (SB) and awake bruxism (AB). It has a multifactorial etiology, and is little explored among adolescents. This thesis is composed of two articles assessing prevalence, associated factors, and path analysis. The objective of article 1 (n=403) was to recognize the pathways influencing the occurrence of probable sleep bruxism (PSB) and probable awake bruxism (PAB) in adolescents. Paper 2 (n=342) aimed to evaluate the association between PSB and biting habits, life satisfaction, sleep characteristics and chronotype profile in adolescents by means of a case-control study. After approval by the institutional ethics committee, adolescents aged 12 to 19 years, regularly enrolled in public and private schools in Belo Horizonte, Brazil, participated in the study. Parents/caregivers answered a questionnaire about their children's sleep characteristics. The adolescents answered the following instruments: a questionnaire about biting habits, sleep characteristics and bruxism report; the Circadian Energy Scale (CIRENS), to measure the chronotype profile; and the self domain of the Brazilian version of the Multidimensional Life Satisfaction Scale for Adolescents (MLSSA). The PSB and PAB were measured considering the positive self-report, added to the presence of attrition dental wear measured in a clinical examination performed by a previously calibrated researcher. Descriptive analysis was included in articles 1 and 2. Article 1 used path analysis, a technique that describes the directed dependencies among a set of variables. In article 2, conditional logistic regression (OR) was performed (p<0.05). As results in article 1, it was found that 22.3% of the adolescents presented PSB and 51.1% PAB. The two manifestations of bruxism showed an association with each other, with a moderate and positive correlation (ß= 0.390). Sleep quality and family income had a direct effect on PSB (ß= - 0.138; ß=0.123; respectively) and on PAB (ß= -0.155; ß=0.116; respectively), so that those with higher income and poor sleep quality tended to show likely bruxism in both SB and AB. Chronotype had a direct effect on PSB, such that adolescents with morning chronotype tended to have the behavior (ß= -0.102). Adolescents who reported drooling on the pillow while sleeping (ß= 0.184) and/or who had restless sleep (ß= 0.104) tended to present PSB. In artgid 2, on the other hand, it was found that poor sleep quality (OR=1.731, 95%CI 1.054-2.842, p=0.030), habit of biting objects often (OR=3.303, 95%CI 1.631-6.690, p=0.001), habit of biting or tightening lips sometimes (OR=2, 134, 95%CI 1.230-3.702, p=0.007) and biting or lip-squeezing often in the two weeks prior to evaluation (OR=2.355, 95%CI 1.203- 4.608, p=0.012) were associated with the occurrence of PAB. It was concluded with article 1 that the chronotype profile, family income and sleep characteristics influence the path taken by PSB, while income and quality of sleep influence PAB. In article 2, it was concluded that adolescents with poor sleep quality and those with biting habits were more likely to present PAB.

Sleep health and the circadian rest-activity pattern four months after COVID-19 / Saúde do sono e o padrão circadiano de atividade e repouso quatro meses depois da COVID-19

ABSTRACT Objective: To describe the prevalence and severity of sleep disorders and circadian alterations in COVID-19 patients four months after the acute phase of the disease. Methods: This was a cross-sectional observational prospective study of patients with mild COVID-19, moderate COVID-19 (requiring hospitalization but no mechanical ventilation), or severe COVID-19 (with ARDS) four months after the acute phase of the disease. All patients underwent a home sleep apnea test and seven-day wrist actigraphy, as well as completing questionnaires to assess sleep quality and mental health. Differences among the three groups of patients were evaluated by ANOVA and the chi-square test. Results: A total of 60 patients were included in the study. Of those, 17 were in the mild COVID-19 group, 18 were in the moderate COVID-19 group, and 25 were in the severe COVID-19 group. Sleep quality, as assessed by satisfaction, alertness, timing, efficiency, and duration scale scores, was found to be impaired in all three groups, which also had a high prevalence of unhealthy sleep, as assessed by the Pittsburgh Sleep Quality Index. The prevalence of insomnia was increased in all three groups, as assessed by the Insomnia Severity Index. The home sleep apnea test showed that the overall prevalence of obstructive sleep apnea was 60%, and seven-day wrist actigraphy showed that total sleep time was < 7 h in all three groups. Changes in quality of life and in the circadian rest-activity pattern were observed in all three groups. Conclusions: Sleep-related symptoms, changes in the circadian rest-activity pattern, and impaired mental health appear to be common in COVID-19 patients four months after the acute phase of the disease, severe COVID-19 being associated with a higher prevalence of obstructive sleep apnea.

RESUMO Objetivo: Descrever a prevalência e gravidade de transtornos do sono e alterações circadianas em pacientes com COVID-19 quatro meses depois da fase aguda da doença. Métodos: Estudo prospectivo observacional transversal com pacientes com COVID-19 leve, moderada (com necessidade de hospitalização, mas não de ventilação mecânica) ou grave (com SDRA) quatro meses depois da fase aguda da doença. Todos os pacientes foram submetidos a teste domiciliar de apneia do sono e actigrafia de sete dias, além de terem preenchido questionários para avaliar a qualidade do sono e a saúde mental. As diferenças entre os três grupos foram avaliadas por meio de ANOVA e teste do qui-quadrado. Resultados: Foram incluídos no estudo 60 pacientes. Destes, 17 eram do grupo COVID-19 leve, 18 do grupo COVID-19 moderada e 25 do grupo COVID-19 grave. A qualidade do sono, avaliada pela pontuação na escala satisfaction, alertness, timing, efficiency, and duration, foi prejudicada nos três grupos, que também apresentaram alta prevalência de sono não saudável, pelo Índice de Qualidade do Sono de Pittsburgh. A prevalência de insônia, avaliada pelo Insomnia Severity Index, foi elevada nos três grupos. O teste domiciliar de apneia do sono mostrou que a prevalência geral de apneia obstrutiva do sono foi de 60%, e a actigrafia de sete dias mostrou que o tempo total de sono foi < 7 h nos três grupos. Alterações da qualidade de vida e do padrão circadiano de atividade e repouso foram observadas nos três grupos. Conclusões: Sintomas relacionados ao sono, alterações do padrão circadiano de atividade e repouso e comprometimento da saúde mental parecem ser comuns em pacientes com COVID-19 quatro meses depois da fase aguda da doença, sendo a COVID-19 grave associada a uma maior prevalência de apneia obstrutiva do sono.

Alteraciones metabólicas y circadianas en personal de enfermería de un hospital público del noroeste de México / Circadian and metabolic alterations among nursing personnel in a northeastern public hospital in Mexico / Alterações metabólicas e circadianas na equipe de enfermagem de um hospital público no noroeste do México

RESUMEN Introducción Las alteraciones metabólicas se vinculan a los ritmos biológicos, dado que es tos sistemas controlan aspectos fisiológicos como patrones de sueño/vigilia, temperatura corporal, presión arterial y liberación de hormonas endocrinas. Objetivo Identificar la relación entre los componentes del síndrome metabólico y disincro nía circadiana en personal de enfermería de un hospital público. Métodos Estudio correlacional. Muestra censal de 30 profesionales de enfermería de dos turnos. Para la recolección de datos se utilizaron tres cédulas: a) antecedentes biosociode mográficos y laborales; b) síndrome metabólico; c) ciclo circadiano. En el procesamiento de datos se utilizó pruebas Chi-cuadrada, R de Pearson y Rho de Spearman, se verificó el su puesto de normalidad con Shapiro-Wilk. Se contó con autorización del Comité de Ética de la institución de salud y con el consentimiento informado de participantes. Resultados 43.3 % del personal de enfermería cumplió con criterios diagnósticos de síndro me metabólico, 100 % del turno nocturno presentó disincronía circadiana con base en el indicador patrón de sueño. El consumo de alcohol y nivel alto de triglicéridos, mostraron relación positiva estadísticamente significativa con la presencia de insomnio (p ≤ 0.001; p ≤ 0.05). Conclusión El síndrome metabólico es un problema de salud con alta prevalencia entre el personal de enfermería, independientemente del nivel académico o del turno laboral. El peso y los triglicéridos fueron indicadores que mostraron relación con patrones de sueño afectados. Esto enfatiza la importancia de incidir en la prevención y tratamiento del sín drome metabólico como una prioridad en el personal de enfermería, desde la salud laboral.

ABSTRACT Introduction Metabolic alterations are linked to biologic rhythms because these cycles control physiologic patterns including sleep/awake, body temperature, blood pressure, and hormones release. Objective To identify the relationship between the metabolic syndrome components and the circadian alterations among nursing personnel in a public hospital in Mexico. Method This is a correlational study. The sample was constituted of 30 nursing professio nals working in 2 shifts. Data were collected using three registers: a) bio socio-demographic and labor-related backgrounds; b) metabolic syndrome; c) circadian cycle. Chi-square, Pearson's R, Spearman's Rho, and Shapiro-Wilk normality test were calculated. The study approval was granted by the Ethics Committee of the Health Institution. The corresponding informed consent was obtained from all participants. Results 43.3 % of the nursing personnel qualified for the metabolic syndrome diagnostic criteria. 100 % of the nurses working the night shift showed circadian alterations in terms of sleep patterns. Alcohol consumption and high levels of triglycerides were positively and significantly related to insomnia (p ≤ 0.001; p ≤ 0.05). Conclusion The metabolic syndrome is a health problem with a high prevalence in all kinds of nursing personnel. Bodyweight and triglyceride levels were indicators suggesting altered sleep patterns. This situation highlights the importance of designing and implementing strategies aimed at preventing and addressing metabolic syndrome among nursing person nel as a labor health priority.

RESUMO Introdução As alterações metabólicas estão ligadas aos ritmos biológicos, pois esses siste mas controlam aspectos fisiológicos como padrões de sono/vigília, temperatura corporal, pressão arterial e liberação de hormônios endócrinos. Objetivo Identificar a relação entre os componentes da síndrome metabólica e a dissincro nia circadiana na equipe de enfermagem de um hospital público. Métodos Estudo correlacional. Amostra censitária de 30 profissionais de enfermagem com dois turnos. Para a coleta de dados foram utilizados três cartões: a) antecedentes biossociodemográficos e laborais; b) síndrome metabólica; c) ciclo circadiano. No processa mento dos dados foram utilizados os testes Qui-quadrado, R de Pearson e Rho de Spearman, a suposição de normalidade foi verificada com Shapiro-Wilk. Contou-se com a autorização do Comitê de Ética da instituição de saúde e o termo de consentimento informado dos participantes. Resultados 43.3 % da equipe de enfermagem atendeu aos critérios diagnósticos para sín drome metabólica, 100 % do plantão noturno apresentou dissincronia circadiana com base no indicador padrão de sono. O consumo de álcool e o nível elevado de triglicerídeos mos traram relação positiva estatisticamente significativa com a presença de insônia (p ≤ 0.001; p ≤ 0.05). Conclusão A síndrome metabólica é um problema de saúde de alta prevalência entre a equipe de enfermagem, independentemente do nível acadêmico ou turno de trabalho. O peso e os triglicerídeos foram indicadores que mostraram relação com os padrões de sono afetados. Isto ressalta a importância de influenciar a prevenção e o tratamento da síndrome metabólica como prioridade na equipe de enfermagem, desde a saúde do trabalhador.