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1.
Eur J Nutr ; 58(1): 325-334, 2019 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-29238857

RESUMEN

PURPOSE: The fat mass and obesity-associated (FTO) gene is involved in energy homeostasis. The A allele of the rs9939609 (SNP; T>A) is associated with obesity and higher food intake, while its effect in energy expenditure remains unclear. The aim of this study is to examine whether FTO rs9939609 is associated with the anthropometric outcomes of a physical exercise program and a dietary intervention. METHODS: We studied two independent samples. The first was composed by children and adolescents in which overweight and obese individuals were submitted to a physical exercise program (n = 136) and normal weight participants served as a control group (n = 172). The second sample was composed by obese women submitted to a hypocaloric dietary intervention (n = 126). RESULTS: Physical exercise and dietary intervention were effective, independently of genotype. We found no association of FTO rs9939609 with obesity in children and adolescents (p = 0.67). The rs9939609 affected the response to dietary intervention in obese women: A allele carriers reduced 2.7 cm less of abdominal circumference (AC) than homozygous TT (p = 0.04), while no effect was observed in response to physical exercise in overweight and obese children and adolescents. CONCLUSIONS: The A allele is associated with a worse outcome in response to the hypocaloric dietary intervention regarding abdominal circumference reduction; the same allele did not show interaction with any anthropometric outcomes in response to the exercise program applied.


Asunto(s)
Dioxigenasa FTO Dependiente de Alfa-Cetoglutarato/genética , Antropometría , Dieta Reductora/métodos , Ejercicio Físico , Sobrepeso/terapia , Programas de Reducción de Peso/métodos , Adolescente , Adulto , Alelos , Brasil , Niño , Femenino , Humanos , Masculino , Polimorfismo de Nucleótido Simple/genética , Adulto Joven
2.
Qual Life Res ; 28(7): 1803-1812, 2019 Jul.
Artículo en Inglés | MEDLINE | ID: mdl-30790154

RESUMEN

PURPOSE: The aim of the present study was to verify the effects of a 16-week multidisciplinary obesity treatment program (MOTP) on health-related quality of life (HRQoL) in adolescents with weight excess. In addition, we verified a possible association between changes on HRQoL and anthropometric, body composition, and cardiorespiratory fitness (CRF) parameters. METHODS: Two hundred four adolescents aged from 15 to 18 years were distributed in control group (CG) and intervention group (IG). They underwent a 16-week MOTP composed by nutritional, psychological, and health-related physical activity group sessions. Moreover, they performed physical exercise sessions three times per week during the whole 16-week program. Data on HRQoL, body composition, CRF and anthropometry were collected using standard protocols and validated questionnaires. RESULTS: The MOTP promoted significant enhancements in all HRQoL domains, except for the school domain in IG. Furthermore, positive correlations between HRQoL and body weight (BW), body fat (BF), waist circumference (WC), and body mass index (BMI) z-score were verified. Higher scores of HRQoL might be achieved by improving these variables. CONCLUSIONS: The 16-week MOTP was effective to improve HRQoL in adolescents with weight excess. This improvement has a positive correlation with enhancements in BW, BMI z-score, WC, and BF. Nevertheless, these findings have not reached a consensus on literature and still need to be further enlightened.


Asunto(s)
Capacidad Cardiovascular/psicología , Estado de Salud , Obesidad/psicología , Obesidad/terapia , Calidad de Vida/psicología , Programas de Reducción de Peso/estadística & datos numéricos , Adolescente , Antropometría , Composición Corporal/fisiología , Índice de Masa Corporal , Peso Corporal/fisiología , Ejercicio Físico/psicología , Femenino , Humanos , Masculino , Instituciones Académicas , Encuestas y Cuestionarios , Circunferencia de la Cintura/fisiología
4.
J Sports Sci ; 34(20): 1902-12, 2016 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-26852885

RESUMEN

The objective of the present study was to investigate the effects of combined training without caloric restriction on inflammatory markers in overweight girls. Thirty-three girls (13-17 years) were assigned into overweight training (n = 17) or overweight control (n = 16) groups. Additionally, a normal-weight group (n = 15) was used as control for the baseline values. The combined training programme consisted of six resistance exercises (three sets of 6-10 repetitions at 60-70% 1 RM) followed by 30 min of aerobic exercise (walking/running) at 50-80% VO2peak, performed in the same 60 min session, 3 days/weeks, for 12 weeks. Body composition, dietary intake, aerobic fitness (VO2peak), muscular strength (1 RM), glycaemia, insulinemia, lipid profile and inflammatory markers (C-reactive protein, interleukin-6, tumour necrosis factor-alpha, interleukin-10, leptin, resistin and adiponectin) were measured before and after intervention. There was a significant decrease in body fat (P < 0.01) and increase in fat-free mass (P < 0.01), VO2peak (P < 0.01), 1 RM for leg press (P < 0.01) and bench press (P < 0.01) in the overweight training group. Concomitantly, this group presented significant decreases in serum concentrations of C-reactive protein (P < 0.05) and leptin (P < 0.05), as well as in insulin resistance (P < 0.05) after the experimental period. In conclusion, 12 weeks of combined training without caloric restriction reduced inflammatory markers associated with obesity in overweight girls.


Asunto(s)
Proteína C-Reactiva/metabolismo , Restricción Calórica , Ejercicio Físico/fisiología , Inflamación/prevención & control , Resistencia a la Insulina , Leptina/sangre , Obesidad/complicaciones , Adipoquinas/sangre , Tejido Adiposo/metabolismo , Adolescente , Biomarcadores , Composición Corporal , Compartimentos de Líquidos Corporales/metabolismo , Citocinas/sangre , Femenino , Humanos , Mediadores de Inflamación/sangre , Fuerza Muscular , Obesidad/metabolismo , Obesidad/terapia , Sobrepeso , Consumo de Oxígeno , Entrenamiento de Fuerza
7.
J Sports Sci ; 32(11): 1050-9, 2014.
Artículo en Inglés | MEDLINE | ID: mdl-24479737

RESUMEN

The objective of the present study was to monitor the immunological and hormonal responses and the occurrence of upper respiratory symptoms in adolescent basketball athletes during the different stages of a sports season. Anthropometric measures, biochemical analyses (interleukin-6, interleukin-10, tumour necrosis factor-alpha, C-reactive protein, testosterone and cortisol), neuromuscular evaluations (standing vertical jumping ability, agility and estimated VO2max) and leukocyte counts were performed at four moments: 72 h before the season (-72 h); before the season (Pre-season); after six weeks, at the end of the preparatory period (Preparatory); and after 20 weeks, at the end of the competitive period (Competitive). Also, the occurrence of upper respiratory symptoms was collected weekly during all stages of the season. There were significant increases in monocytes, cortisol, tumour necrosis factor-alpha and C-reactive protein at the Competitive moment as compared to the Pre-season. In addition, interleukin-10 decreased at the Competitive moment as compared to the Pre-season. Occurrence of upper respiratory symptoms demonstrated increases (38%) during the competitive period as compared to the preparatory. These results suggest that periods of training and competition could increase the occurrence of upper respiratory symptoms in adolescent athletes and this may be due to the unwanted effects of an inflammatory process in response to the excessive stress of training and competition.


Asunto(s)
Baloncesto/fisiología , Ejercicio Físico/fisiología , Hidrocortisona/sangre , Inflamación/etiología , Monocitos/metabolismo , Resistencia Física/fisiología , Enfermedades Respiratorias/etiología , Adolescente , Atletas , Proteína C-Reactiva/metabolismo , Conducta Competitiva , Humanos , Incidencia , Inflamación/sangre , Interleucina-10/sangre , Interleucina-6/sangre , Masculino , Enfermedades Respiratorias/epidemiología , Estaciones del Año , Testosterona/sangre , Factor de Necrosis Tumoral alfa/sangre
8.
J Phys Act Health ; 20(12): 1084-1091, 2023 Dec 01.
Artículo en Inglés | MEDLINE | ID: mdl-37704195

RESUMEN

BACKGROUND: Recent statistical approaches have allowed consideration of the integrated relationships between sedentary behavior (SB) and physical activity (PA) with different health outcomes. The present paper aimed to systematically review the literature and synthesize evidence about associations between hypothetical reallocations from SB to different PA intensities and cardiovascular risk factors in youth. METHODS: A systematic search of 8 databases was performed. Observational studies with a population of children and/or adolescents and based on statistical analysis that investigated the associations between time reallocations from SB to PA and cardiovascular risk factors were included. RESULTS: Twenty-eight studies met the inclusion criteria. Level of evidence (derived from cross-sectional studies) indicated that the reallocation from SB to moderate to vigorous PA was beneficially associated with adiposity, cardiorespiratory fitness, and cardiometabolic biomarkers in youth. Reallocation from SB to light PA was not associated with the analyzed outcomes. Associations derived from longitudinal studies were mostly inconclusive. CONCLUSION: Cardiovascular risk factors could be improved by increasing moderate to vigorous PA at the expense of time spent in SB in pediatric populations. Prospective studies or studies investigating the effects of reallocating sedentary bouts to PA are needed.


Asunto(s)
Enfermedades Cardiovasculares , Ejercicio Físico , Humanos , Adolescente , Niño , Enfermedades Cardiovasculares/epidemiología , Enfermedades Cardiovasculares/etiología , Enfermedades Cardiovasculares/prevención & control , Conducta Sedentaria , Estudios Transversales , Estudios Prospectivos , Factores de Riesgo , Factores de Riesgo de Enfermedad Cardiaca , Acelerometría
9.
Arq Bras Cardiol ; 120(4): e20220398, 2023 03.
Artículo en Inglés, Portugués | MEDLINE | ID: mdl-37098987

RESUMEN

Central blood pressure (cBP) is considered an independent predictor of organ damage, cardiovascular events and all-cause mortality. Evidence has shown that high intensity interval training (HIIT) is superior to moderate-intensity continuous training (MICT) for improving cardiorespiratory fitness and vascular function. However, the effects of these aerobic training modalities on cBP have not yet been properly reviewed.This meta-analysis aims to investigate to effects of HIIT versus MICT on cBP.We conducted a meta-analysis of randomized controlled trials that compared HIIT versus MICT on cBP. Primary outcomes were measures of central systolic blood pressure (cSBP) and central diastolic blood pressure (cDBP). Peripheral systolic blood pressure (pSBP) and diastolic blood pressure (pDBP), pulse wave velocity (PWV) and maximal oxygen uptake (VO2max) were analyzed as second outcomes. Meta-analysis of mean differences (MD) was conducted using the random effects model.Our study included 163 patients enrolled in six trials. We found that HIIT was superior to MICT in reducing the cSBP (MD = -3.12 mmHg, 95% CI: -4.75 to -1.50, p = 0.0002) and SBP (MD = -2.67 mmHg, 95% CI: -5.18 to -0.16, p = 0.04), and increasing VO2max(MD = 2.49 mL/kg/min, 95% CI: 1.25 to 3.73, p = 0.001). However, no significant differences were reported for cDBP, DBP and PWV.HIIT was superior to MICT in reducing the cSBP, which suggests its potential role as a non-pharmacological therapy for high blood pressure.


A pressão arterial central (PAc) é considerada um preditor independente de lesão de órgão, eventos cardiovasculares e mortalidade por todas as causas. Evidências mostram que o treino intervalado de alta intensidade (HIIT) é superior ao treino contínuo de intensidade moderada (MICT) na melhoria da aptidão cardiorrespiratória e da função vascular. No entanto, os efeitos dessas modalidades de treino aeróbico sobre a PAc não foram propriamente revisados. Esta metanálise tem como objetivo investigar os efeitos do HIIT versus MICT sobre a PAc.Conduzimos uma metanálise de ensaios controlados randomizados que compararam HIIT versus MICT sobre a PAc. Os desfechos primários foram Pressão Arterial Sistólica (PAS) central (PASc) e Pressão Arterial Diastólica central (PADc). A PAS periférica (PASp), a PAD periférica (PADp), a Velocidade de Onda de Pulso (VOP) e a captação máxima de oxigênio (VO2max) foram analisadas como desfechos secundários. A metanálise das diferenças médias (DM) foi conduzida usando modelos de efeitos aleatórios.Nosso estudo incluiu 163 pacientes recrutados em seis ensaios. Encontramos que HIIT foi superior ao MICT em reduzir PASc (DM = -3,12 mmHg, IC95% -4,75 ­ 1,50, p = 0,0002) e PAS (DM = -2,67 mmHg, IC95% -5,18 ­ -0,16, p = 0,04) e aumentar VO2max (DM = 2,49 mL/Kg/min, IC95% 1,25 ­ 3,73, p = 0,001). No entanto, não foram relatadas diferenças quanto à PADc, PAD ou VOP. O HIIT foi superior ao MICT em reduzir PASc, sugerindo seu potencial papel como uma terapia não farmacológica para a pressão arterial elevada.


Asunto(s)
Capacidad Cardiovascular , Entrenamiento de Intervalos de Alta Intensidad , Hipertensión , Humanos , Presión Sanguínea/fisiología , Análisis de la Onda del Pulso , Hipertensión/terapia
11.
Gene ; 820: 146296, 2022 Apr 30.
Artículo en Inglés | MEDLINE | ID: mdl-35149152

RESUMEN

We aimed to investigate whether the expression levels and polymorphisms in the ADRB2 gene have influenced the anthropometric and cardiometabolic outcomes changes in obese/overweight children submitted to physical exercise programs. This longitudinal study included 197 overweight or obese children aged 10-16 years, submitted to physical exercise programs - three sessions per week for 12 weeks. Anthropometric and cardiometabolic profile was collected before and after interventions. The ADRB2 gene expression levels were also measured in these two moments in a small intervention group (n = 17) and a control group (n = 18). Arg16Gly and Gln27Glu polymorphisms were genotyped. A positive correlation between ADRB2 expression and loss of body fat (%) (p = 0.038) was observed, which remained after sex and BMI change corrections. Carriers of the Glu27Glu genotype presented a better response to physical exercise programs regarding their triglycerides levels and triglyceride-glucose index (p = 0.001 for both). The participants' responsiveness to physical exercise programs showed variation due to the ADRB2 gene expression and the Gln27Glu polymorphism. A more significant loss of body fat was associated with higher levels of ADRB2 expression, and the Glu27Glu genotype was associated with a better cardiometabolic response. The Arg16Gly polymorphism did not show interaction with the responsiveness to physical exercise.


Asunto(s)
Sobrepeso/genética , Obesidad Infantil/genética , Polimorfismo Genético , Receptores Adrenérgicos beta 2/genética , Receptores Adrenérgicos beta 2/metabolismo , Adolescente , Índice de Masa Corporal , Brasil , Niño , Ejercicio Físico , Terapia por Ejercicio , Femenino , Predisposición Genética a la Enfermedad , Genotipo , Humanos , Estudios Longitudinales , Masculino , Triglicéridos/metabolismo
12.
Physiol Behav ; 230: 113292, 2021 03 01.
Artículo en Inglés | MEDLINE | ID: mdl-33338485

RESUMEN

We compared the heart rate variability (HRV) after a low-intensity resistance exercise (LI-RE) with short (SSC/LI-RE) and long (LSC/LI-RE) set configurations, composed of 10 and 20 repetitions, respectively. Randomly, ten young males performed one session of both RE protocols. Time- and frequency-domain, and nonlinear HRV parameters were assessed at baseline and 20-30 and 50-60 min after protocols. Significant reductions in time-domain, frequency-domain and nonlinear HRV parameters were observed at 20-30 min and 50-60 min after LSC/LI-RE compared to baseline. A low-intensity RE with a long set configuration induces an acute vagal withdrawal and loss of heart rate complexity after exercise.


Asunto(s)
Entrenamiento de Fuerza , Sistema Nervioso Autónomo , Estudios Cruzados , Ejercicio Físico , Corazón , Frecuencia Cardíaca , Humanos , Masculino
13.
Front Cardiovasc Med ; 8: 740442, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-34977170

RESUMEN

Background: Studies have demonstrated the positive effects of physical activity on cardiovascular risk factors. Longitudinal studies using modeled trajectories are necessary to understand patterns of physical activity and association with cardiovascular risk factors. Objective: To analyze the association between sports practice in young people and current physical activity with the trajectory of cardiovascular risk factors in workers at a public hospital. Methods: Four hundred and seventeen workers was followed for four years reporting Physical Activity, health status, lifestyle behaviors and socio-demographic characteristics. Group-based trajectory modeling identified the trajectories of PA and associations with time-stable and time-varying covariates. We considered a range of sociodemographic and health and lifestyle factors as potential covariates. Results: The results shows the association between participation in sports activities in youth and current physical activity and trajectories of cardiovascular risk, adjusted for sex and age (p < 0.05). Adults who reported having played sports in their youth and are currently active have a lower risk of having a history of obesity and low HDL-c than workers who did not play sports in their youth and are currently sedentary 0.690 (0.565-0.844) obesity, 0.647 (0.500-0.837) low HDL-c. Conclusion: The practice of sports in youth and current physical activity is a protective factor against the trajectory of obesity and low HDL-c, mainly in female workers. Programs to encourage the practice of physical activity should be carried out in order to reduce cardiovascular risk factors and prevent chronic diseases in workers.

14.
Front Aging Neurosci ; 12: 51, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32210785

RESUMEN

The association between physical fitness and cognitive performance has been widely investigated in the literature. However, the neurophysiological mechanisms underlying this relationship are not yet clear. Here, we aim to evaluate the interactions between executive function measures, heart rate variability (HRV), and physical fitness in the context of the neurovisceral integration (NVI) theory. Twenty-eight healthy elderly subjects (>60 years) were submitted to evaluation of executive performance with three computerized tests: the N-back test measured working memory capacity, the Stroop Color test evaluated inhibitory control and selective attention, and the Wisconsin Card Sorting Test (WCST) evaluated abstract reasoning and cognitive flexibility. We also used the Physical Testing Battery for the Elderly to measure aerobic capacity, dynamic balance, upper body flexibility, and handgrip strength. Our results confirm the relationship between executive function and physical fitness, particularly between working memory, cardiorespiratory fitness, and dynamic balance. We also demonstrate an association between executive performance and HRV in older people, corroborating previous results from other groups obtained in young adults. However, our regression models did not indicate that HRV mediates the relationship between cognition and physical fitness in the elderly, suggesting that age-related degeneration of autonomic control can affect aspects of NVI in this population.

15.
Nutrition ; 74: 110744, 2020 06.
Artículo en Inglés | MEDLINE | ID: mdl-32217458

RESUMEN

OBJECTIVE: The aims of this study were to assess the capacity of tri-ponderal mass index (TMI) to screen and predict insulin resistance (IR) in overweight Brazilian adolescents, comparing it with body mass index (BMI) predictive capacity; and to verify the IR predictive capacity of other assessment tools such as waist circumference (WC), and waist-to-height ratio (WHR). METHODS: A cross-sectional study was carried out with 217 overweight adolescents, from both sexes, between 12 and 18 y of age. The participants were classified as having IR according to a previous established cutoff point of ≤3.16. IR was determined by the homeostasis model assessment of insulin resistance. The other assessment tools were measured with standard protocols. RESULTS: There was no difference between TMI and BMI to explain the presence of IR. In girls, BMI presented a slightly better predictive capacity to explain IR than TMI. Moreover, WC was reported to be the most effective IR screening methods for girls. Receiver operating characteristic curves showed that TMI and BMI presented similar values of sensibility and specificity for boys. Nevertheless, BMI had a better sensibility and TMI had a better specificity for girls. Interestingly, WC demonstrated a strong sensibility for both sexes. CONCLUSIONS: TMI did not present a superior predictive accuracy for IR screening in overweight Brazilian adolescents when compared with BMI. TMI and BMI presented similar values of sensitivity and specificity for boys and WC a slightly superior IR predictive capacity for girls.


Asunto(s)
Resistencia a la Insulina , Obesidad Infantil , Adolescente , Índice de Masa Corporal , Brasil , Estudios Transversales , Femenino , Humanos , Masculino , Sobrepeso/diagnóstico , Curva ROC , Circunferencia de la Cintura
16.
J Pediatr Endocrinol Metab ; 32(3): 239-246, 2019 Mar 26.
Artículo en Inglés | MEDLINE | ID: mdl-30844760

RESUMEN

Background Cardiorespiratory fitness (CRF) and pubertal stages have been related to many health outcomes, including obesity and adipocytokines. Thus, the present study aimed to analyze the moderator role of CRF and pubertal stage in the relationship between adiposity and adipocytokines in girls. Method This cross-sectional study was performed with 42 pre-pubertal girls aged from 7 to 11 years and 54 post-pubertal girls aged from 13 to 17 years. Blood samples were collected to determine the serum levels of leptin and adiponectin, and then the leptin/adiponectin ratio (L/A ratio) was calculated. CRF, anthropometric and body composition indicators were assessed. For statistical analysis, descriptive statistics and several linear regression models were used. The moderation analysis was tested using the PROCESS macro. Results An interaction between body mass index (BMI) and CRF (ß: -0.70; confidence interval [CI]: -1.29, -0.12), as well as between BMI and pubertal stage (ß: 0.79; CI: 0.28, 1.30) with leptin, was found. Regarding the L/A ratio, an interaction was found only in BMI × CRF (ß: -0.56; CI: -1.06, -0.06). Using a combined interaction (CRF and pubertal stage), the results showed a positive association between BMI with leptin and L/A ratio only in low CRF, pre-pubertal and post-pubertal stages. Conclusion This study suggests a protective role of high levels of CRF in the relationship between BMI and adipocytokines. Despite the effect of pubertal stage, the results suggest that youth should be engaged in physical activity in order to improve CRF levels and consequently improve cardiometabolic health.


Asunto(s)
Adiponectina/sangre , Adiposidad/fisiología , Capacidad Cardiovascular/fisiología , Ejercicio Físico/fisiología , Leptina/sangre , Pubertad/fisiología , Adolescente , Composición Corporal/fisiología , Índice de Masa Corporal , Niño , Estudios Transversales , Femenino , Humanos , Pubertad/sangre
17.
Nutrition ; 60: 19-24, 2019 04.
Artículo en Inglés | MEDLINE | ID: mdl-30508764

RESUMEN

OBJECTIVE: The aim of this study was to verify the prevalence of metabolically healthy obese (MHO) phenotype and associated factors in South American adolescents who are overweight. METHODS: A cross-sectional study was carried out with 340 overweight adolescent boys and girls between 10 and 18 y of age. The participants were classified as MHO according to two definitions: absence of any metabolic syndrome component and absence of insulin resistance (IR). The MHO phenotype-associated factors analyzed were age, sex, nutritional status, waist circumference (WC), body composition, metabolic profile, and cardiorespiratory fitness. Multivariable logistic regression was used to determine predictors of MHO using odds ratios with 95% confidence intervals. RESULTS: The prevalence of MHO in South American overweight adolescents was 49.4% and 55.9% according to MS and IR criteria, respectively. Sex and WC were predictors of the MHO phenotype, considering MS classification criterion. For the IR criterion, age, WC, and triacylglycerol levels were independent predictors of MHO in adolescents. Cardiorespiratory fitness did not predict MHO phenotype in any of the criteria used. CONCLUSIONS: The prevalence of MHO in South American overweight adolescents was high and varied according to the definition used. Age, sex, WC, and triacylglycerolslevel were independent predictors of the MHO phenotype in this population.


Asunto(s)
Estado Nutricional , Obesidad Metabólica Benigna/epidemiología , Obesidad Infantil/epidemiología , Triglicéridos/sangre , Circunferencia de la Cintura , Adolescente , Niño , Estudios Transversales , Femenino , Humanos , Resistencia a la Insulina , Modelos Logísticos , Masculino , Obesidad Metabólica Benigna/sangre , Obesidad Metabólica Benigna/fisiopatología , Obesidad Infantil/sangre , Obesidad Infantil/fisiopatología , Fenotipo , Prevalencia , Factores de Riesgo
18.
J Pediatr Endocrinol Metab ; 32(10): 1163-1170, 2019 Oct 25.
Artículo en Inglés | MEDLINE | ID: mdl-31472061

RESUMEN

Background The aim of the present study was to investigate the correlation between the triglyceride/glucose index (TyG index) and homeostasis model assessment of insulin resistance (HOMA-IR). Additionally, we compared the ability of the TyG index and triglycerides/high-density lipoprotein cholesterol (TG/HDL-c) index and the combination of these two indices (TyG index plus TG/HDL-c) to predict insulin resistance (IR) in South American overweight and obese children and adolescents. Methods A cross-sectional study was carried out in 345 overweight adolescents aged 10-18 years, from both the sexes. The TyG index was calculated as Ln (fasting triglycerides [mg/dL] × fasting glucose [mg/dL])/2, while the TG/HDL-c index was calculated by the division of TG (mg/dL) by HDL-c (mg/dL). HOMA-IR was calculated with the formula: fasting insulin (FI) (U/mL) × fasting glucose (mmol/L)/22.5. The cut-off point used to determine the presence of IR was HOMA-IR ≥ 3.16. Results The TyG index showed a positive correlation with HOMA-IR. The area under the receiver operating characteristic (ROC) curve of the TyG index was 0.74, indicating good sensitivity (75.7%) and specificity (67.4%). Furthermore, the TyG index cut-off point of >4.44 was established for IR prediction in this population. Conclusions The TyG index is a simple and cost-effective surrogate marker of IR in South American overweight children and adolescents. Moreover, due to its good accessibility, it can be used in large epidemiological studies.


Asunto(s)
Biomarcadores/sangre , Glucemia/análisis , Intolerancia a la Glucosa/diagnóstico , Resistencia a la Insulina , Obesidad/fisiopatología , Sobrepeso/fisiopatología , Triglicéridos/sangre , Adolescente , Niño , Estudios Transversales , Femenino , Estudios de Seguimiento , Intolerancia a la Glucosa/sangre , Intolerancia a la Glucosa/epidemiología , Humanos , Incidencia , Masculino , Pronóstico , América del Sur/epidemiología
19.
J Pediatr (Rio J) ; 94(4): 425-431, 2018.
Artículo en Inglés | MEDLINE | ID: mdl-28941386

RESUMEN

OBJECTIVE: To analyze the association between the Trp64Arg polymorphism of the ADRB3 gene, maximal fat oxidation rates and the lipid profile levels in non-obese adolescents. METHODS: 72 schoolchildren, of both genders, aged between 11 and 17 years, participated in the study. The anthropometric and body composition variables, in addition to total cholesterol, HDL-c, LDL-c, triglycerides, insulin, and basal glycemia, were evaluated. The sample was divided into two groups according to the presence or absence of the polymorphism: non-carriers of the Arg64 allele, i.e., homozygous (Trp64Trp: n=54), and carriers of the Arg64 allele (Trp64Arg+Arg64Arg: n=18), in which the frequency of the Arg64 allele was 15.2%. The maximal oxygen uptake and peak of oxygen uptake during exercise were obtained through the symptom-limited, submaximal treadmill test. Maximal fat oxidation was determined according to the ventilatory ratio proposed in Lusk's table. RESULTS: Adolescents carrying the less frequent allele (Trp64Arg and Arg64Arg) had higher LDL-c levels (p=0.031) and lower maximal fat oxidation rates (p=0.038) when compared with non-carriers (Trp64Trp). CONCLUSIONS: Although the physiological processes related to lipolysis and lipid metabolism are complex, the presence of the Arg 64 allele was associated with lower rates of FATMAX during aerobic exercise, as well as with higher levels of LDL-c in adolescents.


Asunto(s)
Tejido Adiposo/metabolismo , LDL-Colesterol/sangre , Oxidación-Reducción , Polimorfismo Genético/genética , Receptores Adrenérgicos beta 3/genética , Adolescente , Alelos , Composición Corporal , Niño , Estudios Transversales , Femenino , Genotipo , Humanos , Masculino
20.
Arq. bras. cardiol ; 120(4): e20220398, 2023. tab, graf
Artículo en Portugués | LILACS-Express | LILACS | ID: biblio-1429806

RESUMEN

Resumo A pressão arterial central (PAc) é considerada um preditor independente de lesão de órgão, eventos cardiovasculares e mortalidade por todas as causas. Evidências mostram que o treino intervalado de alta intensidade (HIIT) é superior ao treino contínuo de intensidade moderada (MICT) na melhoria da aptidão cardiorrespiratória e da função vascular. No entanto, os efeitos dessas modalidades de treino aeróbico sobre a PAc não foram propriamente revisados. Esta metanálise tem como objetivo investigar os efeitos do HIIT versus MICT sobre a PAc.Conduzimos uma metanálise de ensaios controlados randomizados que compararam HIIT versus MICT sobre a PAc. Os desfechos primários foram Pressão Arterial Sistólica (PAS) central (PASc) e Pressão Arterial Diastólica central (PADc). A PAS periférica (PASp), a PAD periférica (PADp), a Velocidade de Onda de Pulso (VOP) e a captação máxima de oxigênio (VO2max) foram analisadas como desfechos secundários. A metanálise das diferenças médias (DM) foi conduzida usando modelos de efeitos aleatórios.Nosso estudo incluiu 163 pacientes recrutados em seis ensaios. Encontramos que HIIT foi superior ao MICT em reduzir PASc (DM = -3,12 mmHg, IC95% -4,75 - 1,50, p = 0,0002) e PAS (DM = -2,67 mmHg, IC95% -5,18 - -0,16, p = 0,04) e aumentar VO2max (DM = 2,49 mL/Kg/min, IC95% 1,25 - 3,73, p = 0,001). No entanto, não foram relatadas diferenças quanto à PADc, PAD ou VOP. O HIIT foi superior ao MICT em reduzir PASc, sugerindo seu potencial papel como uma terapia não farmacológica para a pressão arterial elevada.


Abstract Central blood pressure (cBP) is considered an independent predictor of organ damage, cardiovascular events and all-cause mortality. Evidence has shown that high intensity interval training (HIIT) is superior to moderate-intensity continuous training (MICT) for improving cardiorespiratory fitness and vascular function. However, the effects of these aerobic training modalities on cBP have not yet been properly reviewed.This meta-analysis aims to investigate to effects of HIIT versus MICT on cBP.We conducted a meta-analysis of randomized controlled trials that compared HIIT versus MICT on cBP. Primary outcomes were measures of central systolic blood pressure (cSBP) and central diastolic blood pressure (cDBP). Peripheral systolic blood pressure (pSBP) and diastolic blood pressure (pDBP), pulse wave velocity (PWV) and maximal oxygen uptake (VO2max) were analyzed as second outcomes. Meta-analysis of mean differences (MD) was conducted using the random effects model.Our study included 163 patients enrolled in six trials. We found that HIIT was superior to MICT in reducing the cSBP (MD = -3.12 mmHg, 95% CI: -4.75 to -1.50, p = 0.0002) and SBP (MD = -2.67 mmHg, 95% CI: -5.18 to -0.16, p = 0.04), and increasing VO2max(MD = 2.49 mL/kg/min, 95% CI: 1.25 to 3.73, p = 0.001). However, no significant differences were reported for cDBP, DBP and PWV.HIIT was superior to MICT in reducing the cSBP, which suggests its potential role as a non-pharmacological therapy for high blood pressure.

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