Influencia de la altitud y el estado de hidratación en los soldados de la VIII Brigada de Montaña al nivel de alta montaña / Influence of altitude and hydration status on soldiers of the VIII Mountain Brigade at high mountain level

Resumen Introducción: realizar ejercicio en altitudes elevadas merece consideraciones especiales a la hora de determinar las necesidades de líquidos en los deportistas y más aún en las tropas de montaña del ejército. Mantener un estado de euhidratación durante la actividad física es imprescindible para evitar complicaciones en la salud. Esta investigación tiene como objetivo identificar el estado de hidratación en los soldados de la Brigada de Montaña VIII del Ejército Argentino con asiento en Mendoza, Argentina en el año 2021. Materiales y método: estudio descriptivo, observacional, longitudinal. La muestra fue conformada por 87 soldados masculinos. Los datos recopilados incluyeron la cantidad y tipo de ingesta de líquidos, la gravedad específica urinaria mediante un refractómetro manual, el porcentaje de cambio de peso y la percepción subjetiva de sed. El análisis estadístico para variables cualitativas se realizó con la prueba χ2 y con IC 95%, las cuantitativas se compararon mediante la prueba t-Student. Resultados: el 96,5% de los soldados se hidrataron con agua. La ingesta media de líquidos fue 1,34±0,74 litros (L), con una ingesta máxima de 4 L y un mínimo de 0,5 L. El 36% de la muestra presentó una pérdida de peso corporal superior al 2% al finalizar la actividad, la diferencia relativa referida al peso inicial medio fue 1,7±1,4%. Al finalizar, el 43% clasificó como euhidratado y 29% como hipohidratado severo según la gravedad específica urinaria. Según la percepción subjetiva de sed al finalizar solo un 14% de los soldados no tenía sed. Conclusión: el estudio reflejó que el 64% de los soldados mantuvo una estrategia de reposición de líquidos óptima, dado que las pérdidas de peso se limitaron a lo esperable.

Abstract Introduction: exercising at high altitudes deserves special considerations when it comes to determining fluid requirements in athletes, especially in Army mountain troops. Maintaining a state of euhydration during physical activity is essential to avoid health complications. The aim of this research is to identify the hydration status of soldiers of the VIII Mountain Brigade of the Argentine Army based in Mendoza, Argentina in 2021. Materials and method: descriptive, observational, longitudinal study. The sample consisted of 87 male soldiers. The data collected included the amount and type of fluid intake, urinary specific gravity by using a manual refractometer, percentage of weight change and subjective perception of thirst. Statistical analysis for qualitative variables was done with the χ2 test and 95% CI, quantitative variables were compared using the t-Student test. Results: 96.5% of soldiers hydrated themselves with water. The mean fluid intake was 1.34±0.74 liters (L), with a maximum intake of 4 L and a minimum of 0.5 L. 36% percent of the sample presented a body weight loss of more than 2% at the end of the activity, the relative difference referred to the mean initial weight was 1.7±1.4%. At the end, 43% were classified as euhydrated and 29% as severely hypohydrated according to specific urinary gravity. According to the subjective perception of thirst at the end, only 14% of the soldiers were not thirsty. Conclusion: the study showed that 64% of the soldiers maintained an optimal fluid replacement strategy, given that weight losses were limited to what was expected.

La sed ¿un mecanismo suficiente para lograr euhidratación?: una revisión narrativa / Is thirst sufficient as a mechanism for achieving euhydration? a narrative review

Capitán, C. y Aragón, L.F. (2023). La sed ¿un mecanismo suficiente para lograr euhidratación?: una revisión narrativa. PENSAR EN MOVIMIENTO: Revista de Ciencias del Ejercicio y la Salud, 21(1), 1-16. El papel de la percepción de sed para mantener el balance hídrico ha sido ampliamente estudiado, tanto durante el ejercicio como después de este. Sin embargo, la forma de evaluarla y la eficacia de los instrumentos existentes son aún áreas que necesitan más investigación. El objetivo de esta revisión fue integrar, de forma general, la información disponible en la literatura sobre el funcionamiento del mecanismo de la sed como respuesta a la deshidratación durante y después del ejercicio. Se explican los mecanismos fisiológicos y las respuestas de estos durante y posterior al ejercicio; además, se describen los instrumentos disponibles en la literatura científica, sus debilidades y fortalezas, y se plantea una serie de preguntas que aún no tienen respuesta en el área. En esta revisión se presenta el aspecto teórico de los mecanismos de la sed, además, se discuten los estudios científicos que respaldan o refutan el comportamiento de estos mecanismos en el ejercicio. Finalmente, se hace un resumen de las principales conclusiones extraídas de la literatura científica sobre la sed como un mecanismo suficiente para prevenir la deshidratación tanto durante como después del ejercicio.

Capitán, C. y Aragón, L.F. (2023). Is thirst sufficient as a mechanism for achieving euhydration? a narrative review. PENSAR EN MOVIMIENTO: Revista de Ciencias del Ejercicio y la Salud, 21(1), 1-16. The role of thirst perception for keeping hydric balance, both during and after exercise, has been extensively studied. However, the way to assess it and the effectiveness of the existing instruments are areas that still require further research. The objective of this review is to integrate, in a general way, the information available in the literature on the functioning of the thirst mechanism as a response to dehydration during and after exercise. The physiological mechanisms and their responses during and after exercise are explained. In addition, a description of the instruments available in scientific literature is included, together with their weaknesses and strengths, and a series of as yet unanswered questions in this area are raised. This review presents the theoretical aspect of thirst mechanisms, and discusses the scientific studies that support or refute the behavior of these mechanisms in exercise. Finally, a summary is made of the major conclusions drawn from the scientific literature on thirst as a sufficient mechanism to prevent dehydration both during and after exercise.

Capitán, C. y Aragón, L.F. (2023). A sede é um mecanismo suficiente para alcançar a hidratação? uma revisão narrativa. PENSAR EN MOVIMIENTO: Revista de Ciencias del Ejercicio y la Salud, 21(1), 1-16. O papel da percepção da sede na manutenção do equilíbrio hídrico tem sido amplamente estudado, tanto durante quanto após o exercício. Entretanto, como avaliá-la e a eficácia dos instrumentos existentes ainda são áreas que necessitam de mais pesquisas. Esta revisão visou integrar, de forma geral, as informações disponíveis na literatura sobre o funcionamento do mecanismo da sede em resposta à desidratação durante e após o exercício. Ele explica os mecanismos fisiológicos e suas respostas durante e após o exercício, descreve os instrumentos disponíveis na literatura científica, seus pontos fracos e fortes, e levanta uma série de questões que permanecem sem resposta no campo. Esta revisão apresenta o aspecto teórico dos mecanismos da sede e discute os estudos científicos que respaldam ou refutam o comportamento desses mecanismos no exercício. Finalmente, é feito um resumo das principais conclusões extraídas da literatura científica sobre a sede como mecanismo suficiente para prevenir a desidratação tanto durante quanto após o exercício.

The impact of hydration status and fluid distribution on pulmonary function in COPD patients.

Chronic Obstructive Pulmonary Disease (COPD) patients have alterations in body composition. Bioelectrical impedance analysis (BIA) evaluates body composition, hydration status, and fluid distribution. Subjects with fluid disturbances have been found to have lower FEV1, respiratory muscle strength, and poor prognosis. We aimed to evaluate the effect of hydration status and fluid distribution on pulmonary function in COPD patients. A cross-sectional study, 180 patients with a confirmed diagnosis of COPD were included. Patients with asthma, advanced renal or liver disease, acute HF, exacerbation of COPD, or pacemakers were excluded. Hydration status variables (TBW, ECW, ICW) and disturbance of fluid distribution [impedance ratio (IR) > 0.84 and phase angle (PhA)] were evaluated by BIA. Pulmonary function was assessed by spirometry. The mean population age was 71.55 ± 8.94 years; 55% were men. Subjects were divided into two groups according to the IR ≥ 0.84 or < 0.84. The group with higher IR ≥ 0.84 had lower FEV1, FVC, FEV1/FVC, DLCO and, PhA compared to those with IR < 0.84. After adjusting for confounding variables TBW, ECW, IR ≥ 0.84, PhA, and resistance/height increase were associated with decreased FEV1. In the same way, with IR ≥ 0.84, edema index ≥ 0.48, trunk and abdominal IR were negatively associated with FVC, and PhA had a positive association with FVC. Fluid distribution, especially IR and PhA, could be a useful parameter for predicting pulmonary function in COPD patients.

Fluid intake, hydration status and body mass changes in U-15 judo athletes during a training day

Despite numerous studies related to dehydration there is still a lack of scientific literature presenting hydration status and fluid intake of judo athletes during different periods. Therefore, the aim of this study was to investigate, fluid intake, hydration status and body weight changes of young judo athletes during a typical day of training in preparation period. Twenty-two young judo athletes (age: 12 ± 0.7 y, experience: 3.5 ± 1.1) voluntarily participated in this study. Hydration status and weight were examined in the morning, before and immediately after the training. All athletes trained 90 min and they consumed fluids ad libitum during the exercise. According to morning urine specific gravity (USG) values, 81.2% of the athletes were dehydrated while only 18.8% of the athletes were euhydrated. Pre-training urine measurements showed that 63.64% of the athletes presented dehydration and 77.27% of the athletes completed the training in dehydrated condition despite fluid availability during the training. Mean body weight loss during training was -0.64 ± 0.66%. It can be concluded that young judo athletes presented high prevalence of dehydration as indicated by USG values. Most of the athletes were dehydrated during a typical training day and completed the training in more dehydrated conditions compared to pre training values despite ad libitum fluid intake. It is of great importance to evaluate hydration status of the athletes before training to refrain from common practice of fluid restriction for weight loss and adverse effects of a persistent state of fluid deficit on physical and health related state.

Atención de enfermería en adultos jóvenes con insuficiencia renal aguda: Revisión narrativa / Nursing care in young adults with acute kidney failure: Narrative review

El daño renal está reconocido como la reducción de la función renal, el cual se ve generalmente reflejado por una caída en la diuresis. A nivel mundial, el porcentaje de personas que padece daño renal va en aumento, esto debido a múltiples aspectos. En este sentido, se reconoce que el personal de enfermería es quien idóneamente tiene un gran rol en la educación de la población, para la prevención del daño renal agudo, previniendo con ello el daño renal crónico. De esta manera, en el escrito se abordan aspectos generales más relevantes, de la hidratación, la alimentación, la actividad física, el consumo de alcohol, la automedicación y la prevención de infecciones de las vías urinarias, como parte de los aspectos modificables y en los que las personas tienen directa injerencia en sus acciones, con la debida información, con los que el personal de enfermería puede reforzar sus recursos en materia de educación a la población. De la misma manera, se muestran estudios de diseño cuasiexperimental, como una manera de resaltar que puede medirse el impacto de la educación en la población en una época en donde requerimos tener mayor evidencia de la efectividad de las intervenciones que realicemos.

Renal insufficiency it is recognized as the reduction of the renal function, reflected by the decreased urine output. Worldwide, the amount of people whom have renal insufficiency it is growing, by many reasons. Because of this, is recognized that nursing staff is the best option at the population education, in order to prevent acute renal insufficiency, preventing with this, chronical renal insufficiency. In this document, it is possible to review, the most important general aspects of hydration, feeding, physical activity, alcohol consumption, self-medication and prevention of urinary tract infections, as part of modifiable aspects that people handle as part of their personal health actions, with the proper information, with which nursing staff can strengthen their resources in health education to the population. In this way, this paper shows some quasi-experimental studies, as a way to highlight that it is possible to measure the impact of population education, in a moment that the health system requires more evidence of the effectiveness of the interventions.

Perfil de composición corporal en militares élite chilenos / Body composition profile of elite Chilean military

RESUMEN: La Bioimpedancia Eléctrica (BIA), al ser una técnica no invasiva pero de elevada precisión, se ha convertido en la actualidad en una herramienta valiosa para determinar la composición corporal en militares, facilitado el control de las distintas variables que se asocian a cada especialidad. El objetivo del presente estudio fue describir el perfil de composición corporal en militares de elite al momento de finalizar un curso de especialización. Participaron 11 militares con un rango de edad entre 22 y 29 años. Se evalúo la composición corporal a través de BIA, inmediatamente después de finalizado un curso de especialización para militares de élite. Las evaluaciones en los militares sobre las variables de la composición corporal a través de BIA mostraron: peso corporal de 84,3 ± 4,52 kg, talla 1,78 ± 0,06 m, índice de masa corporal (IMC) 26,5 ± 1,09, tejido adiposo de 13,7 ± 3,65 %, tejido muscular 49,5 ± 2,34 %, masa libre de grasa 72,7 ± 5,23 kg y 53,2 ± 3,78 l de agua corporal total. Conclusiones: Los militares de elite presentaron elevados niveles de masa libre de grasa, tejido muscular y bajos niveles de tejido adiposo lo que favorece el desarrollo de las actividades militares especializadas y disminuye el riesgo de lesiones. Los datos aquí recogidos sirven como marco de referencia para futuros estudios.

SUMMARY: Electrical bioimpedance (BIA), being a non- invasive technique but with high precision, has become a valuable tool for determining body composition in the military, facilitating the control of the different variables associated with each specialty. The aim of the present study was to describe the body composition profile of elite military personnel at the end of a specialization course. Eleven military personnel between 22 and 29 years of age participated in the study. Body composition was assessed by BIA immediately after completion of a specialization course for elite military personnel. Assessments in the military on body composition variables through BIA showed: body weight of 84.3 ± 4.52 kg, height 1.78 ± 0.06 m, body mass index (BMI) 26.5 ± 1.09, adipose tissue of 13.7 ± 3.65 %, muscle tissue 49.5 ± 2.34 %, fat free mass 72.7 ± 5.23 kg and 53.2 ± 3.78 l of total body water. Conclusions: Elite military personnel presented high levels of fat free mass, muscle tissue and low levels of adipose tissue which favors the development of specialized military activities and decreases the risk of injury. The data collected here serve as a frame of reference for future studies.

Elite Croatian junior taekwondo competitors: morphological characteristics and body composition reference values / Competidores croatas de taekwondo junior de élite: características morfológicas y valores de referencia de composición corporal

SUMMARY: The main purpose of this study was to determine the body composition and anthropometric reference values of male and female junior Croatian taekwondo competitors according to official weight category. Additional aim of the study was to identify possible differences in variables between the weight categories. The sample comprised 247 junior participants of the national taekwondo championships divided into male (N=121) and female (N=126). The variable sample was defined by a set of 8 measurements: Body height (cm), Body mass (kg), Body mass index, Body fat (%), Body fat (kg), Muscle mass (kg), Lean body mass (kg) and Total body water (%). Results confirm previous studies proving that younger taekwondo practitioners have higher levels of body fat than their more experienced peers (seniors). Significant differences were only found between lean and heavy categories. Male junior taekwondo athletes show total body water percentages from 57.4 to 74.8 %, with significantly lower percentages in higher weight categories, while female athletes in heigher categories demonstrate a worrying level of hydration status, therefore endangering their performance and overall health. As the first paper that investigates the reference values of junior taekwondo athletes but based on official weight categories it is especially important as each weight category warrant different body composition requirements, as seen from significant differences across different variables. Future studies should include motor abilities inspection throughout the weight categories and possible use of calculation of metabolic age.

RESUMEN: El objetivo principal de este estudio fue determinar la composición corporal y los valores de referencia antropométricos de los competidores croatas masculinos y femeninos de taekwondo junior según la categoría oficial de peso. Además, se analizó identificar las posibles diferencias en las variables entre las categorías de peso. La muestra estuvo compuesta por 247 participantes junior de los campeonatos nacionales de taekwondo divididos en hombres (N = 121) y mujeres (N = 126). La muestra variable se definió mediante un conjunto de 8 medidas: altura corporal (cm), masa corporal (kg), índice de masa corporal, grasa corporal (%), grasa corporal (kg), masa muscular (kg), masa corporal magra (kg) y agua corporal total (%). Los resultados confirmaron estudios previos que demuestran que los practicantes de taekwondo más jóvenes tienen niveles más altos de grasa corporal que sus pares más experimentados (personas mayores). Solo se encontraron diferencias significativas entre las categorías magra y pesada. Los atletas masculinos de taekwondo junior muestran porcentajes de agua corporal total del 57,4 al 74,8 %, con porcentajes significativamente más bajos en las categorías de peso más alto, mientras que las atletas femeninas en las categorías más altas, demuestran un nivel preocupante de estado de hidratación, poniendo en peligro su rendimiento y salud en general. Como el primer artículo que investiga los valores de referencia de los atletas de taekwondo junior, pero basado en categorías de peso oficiales, es especialmente importante ya que cada categoría de peso garantiza diferentes requisitos de composición corporal, como se puede observar en las diferencias significativas entre las diversas variables. Los estudios futuros deberían incluir un análisis de las habilidades motoras en todas las categorías de peso y el posible uso del cálculo de la edad metabólica.

The Hydration Status of Female Collegiate Soccer Players Over Consecutive Training and Match Days / Estado de Hidratación de Jugadoras de Fútbol Universitarias Durante Días de Entrenamiento y Partidos Consecutivos

Abstract Purpose: Hydration has been shown to play a pivotal role in sport. Soccer is a team sport in which the integrity of all players is vital for team performance; thus, individual player hydration status is important. The primary aim of this study was to investigate the hydration status of female collegiate soccer players during regular season. Methods: Sixteen collegiate female soccer players (age: 20.4 ± 0.8 years; height: 163.6 ± 6.9 cm; weight: 65.3 ± 12 kg) provided urine over 9 days to monitor their hydration status. Hydration was determined by urine specific gravity (Usg). Usg was analyzed in the morning (AM) and in the afternoon before practice/game (PM). Results: All 16 players were at least minimally hypohydrated (Usg > 1.010) in the AM on 5 of the 9 days tested. Players had significantly higher Usg values in the AM as compared to PM (F(1,250) = 23.09; p < 0.0001); however, there was no significant time*day interaction (F(1,250) = 1.98; p = 0.16). Conclusion: Data show a high prevalence of hypohydration occurring in this specific population. This sub-optimal hydration status could be a cause for concern in terms of overall performance. Efforts should be made to integrate hydration interventions and daily monitoring to minimize hypohydration in players.

Resumen Propósito: Se ha demostrado que la hidratación juega un papel fundamental en el deporte. El fútbol es un deporte de equipo en el que la integridad de todos los jugadores es vital para su rendimiento; por lo tanto, el estado de hidratación de cada jugador es importante. El objetivo principal de este estudio fue investigar el estado de hidratación de las jugadoras universitarias de fútbol durante la temporada regular. Métodos: Dieciséis jugadoras universitarias de fútbol (edad: 20.4 ± 0.8 años; estatura: 163.6 ± 6.9 cm; peso: 65.3 ± 12 kg) proporcionaron muestras de orina durante 9 días para controlar su estado de hidratación, la cual se determinó por la gravedad específica de la orina (Usg). La Usg se analizó en la mañana (AM) y en la tarde antes del entrenamiento o el juego (PM). Resultados: Las 16 jugadoras estaban al menos mínimamente hipohidratadas (Usg > 1.010) en la AM en 5 de los 9 días medidos. Las jugadoras tuvieron valores Usg significativamente más altos en AM en comparación con PM (F (1,250) = 23.09; p < 0.0001); sin embargo, no hubo interacción significativa de tiempo * día (F(1,250) = 1.98; p = 0.16). Conclusión: los datos muestran una alta prevalencia de hipohidratación en esta población específica. Este estado de hidratación subóptimo podría ser motivo de preocupación en términos de rendimiento general. Se deberían hacer esfuerzos para integrar las intervenciones de hidratación y el monitoreo diario para reducir al mínimo la hipohidratación en las jugadoras.

Resumo Objetivo: Foi demonstrado que a hidratação desempenha um papel fundamental no esporte. O futebol é um esporte coletivo no qual a integridade de todos os jogadores é vital para o desempenho da equipe; portanto, o estado de hidratação de cada jogador é importante. O objetivo principal deste estudo foi investigar o estado de hidratação de universitárias jogadoras de futebol do sexo feminino durante a temporada regular. Métodos: Dezesseis universitárias jogadoras de futebol (idade: 20,4 ± 0,8 anos; altura: 163,6 ± 6,9 cm; peso: 65,3 ± 12 kg) forneceram amostras de urina por 9 dias para monitorar seu estado de hidratação. A hidratação foi determinada pela gravidade específica da urina Usg. Sua Usg foi analisado pela manhã (matutino) e à tarde (vespertino) antes do treino ou jogo. Resultados: As 16 jogadoras estavam minimamente hipohidratadas (Usg > 1.010) no período matutino em 5 dos 9 dias medidos. As jogadoras apresentaram valores de Usg significativamente maiores no período matutino em comparação ao vespertino (F (1.250) = 23,09; p <0,0001); no entanto, não houve interação tempo * dia significativa (F (1.250) = 1,98; p = 0,16). Conclusão: os dados mostram uma alta prevalência de hipohidratação nesta população específica. Este estado de hidratação abaixo do ideal pode ser uma preocupação em termos de desempenho geral. Devem ser feitos esforços para integrar intervenções de hidratação e monitoramento diário para minimizar a hipohidratação em jogadoras.

Bioelectrical impedance vector analysis (BIVA) in university athletes.

BACKGROUND: Bioelectrical impedance vector analysis (BIVA) is able to identify differences in hydration status and body composition components, such as body cell mass (BCM) by means of plotting individuals in ellipses, when comparing groups with different characteristics. OBJECTIVE: Compare the confidence and tolerance ellipses of BIVA in individual and team sports athletes with a non-athlete reference population. DESIGN AND PARTICIPANTS: One hundred sixty-seven college athletes (team sports: 117 athletes, individual sports: 50 athletes) aged between 18 and 35 years. Bioelectrical impedance was used to measure resistance (R) and reactance (Xc) values that were used in the BIVA analysis to identify hydration status and BCM, respectively. Hotelling's t-test was used to identify differences between groups in the confidence ellipses and the comparison was made with a non-athlete Italian reference population. RESULTS: There were no differences between male team sports and individual athletes (p = 0.151) and for female athletes (p = 0.624). Most athletes were located in the 50% tolerance ellipses, indicating adequate hydration. Compared to the Italian a non-athlete population, athletes of both sexes presented left impedance vector deviation in the minor axis (Xc) of the tolerance ellipses, indicating higher BCM. CONCLUSION: There were no differences in BIVA between team and individual sports athletes, but most athletes presented an adequate hydration state and, compared to a non-athlete population, the athletes of the present study presented higher BCM.

KDOQI US Commentary on the 2020 ISPD Practice Recommendations for Prescribing High-Quality Goal-Directed Peritoneal Dialysis.

The recently published 2020 International Society for Peritoneal Dialysis (ISPD) practice recommendations regarding prescription of high-quality goal-directed peritoneal dialysis differ fundamentally from previous guidelines that focused on "adequacy" of dialysis. The new ISPD publication emphasizes the need for a person-centered approach with shared decision making between the individual performing peritoneal dialysis and the clinical care team while taking a broader view of the various issues faced by that individual. Cognizant of the lack of strong evidence for the recommendations made, they are labeled as "practice points" rather than being graded numerically. This commentary presents the views of a work group convened by the National Kidney Foundation's Kidney Disease Outcomes Quality Initiative (KDOQI) to assess these recommendations and assist clinical providers in the United States in interpreting and implementing them. This will require changes to the current clinical paradigm, including greater resource allocation to allow for enhanced services that provide a more holistic and person-centered assessment of the quality of dialysis delivered.

Practices of Athletic Trainers Using Weight Charts to Determine Hydration Status and Fluid-Intervention Strategies.

CONTEXT: Determining an athlete's hydration status allows hydration-related concerns to be identified before significant medical or performance concerns arise. Weight charts are an accurate measure of hydration status changes, yet their clinical use by athletic trainers (ATs) is unknown. OBJECTIVE: To investigate ATs' use of weight charts in athletic settings and describe their subsequent clinical decisions. DESIGN: Cross-sectional survey. SETTING: High schools and National Collegiate Athletic Association Divisions I, II, III and National Association Intercollegiate Athletics colleges. PATIENTS OR OTHER PARTICIPANTS: A total of 354 ATs (men = 162, women = 175; 17 respondents did not answer the demographic questions) responded across athletic settings (Division I [45.7%]; Division II, Division III, National Association Intercollegiate Athletics combined [n = 19.9%]; and high school [34.4%]). MAIN OUTCOME MEASURE(S): The 26-question online survey was developed by content experts and pilot tested before data collection. Participants answered questions focused on weight-chart use (implementation, timing, and calculations) and clinical decision processes (policies, interventions, and referral). Frequency statistics were calculated. RESULTS: The majority of ATs (57.2%) did not use weight charts. Of those who did, most (76.0%) used charts with football, soccer (28%), and wrestling (6%) athletes. They calculated changes as either an absolute (42.2%) or percentage (36.7%) change from prepractice to postpractice; only 11.7% used a baseline weight for calculations. Of those who used the percentage change in body mass, 66.0% selected a threshold of -3% to -4% for an intervention. Most ATs (97.0%) intervened with verbal education, whereas only one-third (37.0%) provided specific fluid amounts based on body mass changes. CONCLUSIONS: Typically, ATs in athletic settings did not use weight charts. They considered a body mass change of -3% the indication for intervention but did not specify rehydration amounts for hypohydrated athletes. Educational workshops or technology applications could be developed to encourage ATs to use weight charts and calculate appropriate individual fluid interventions for their athletes.

Increased vegetation ground cover reduces water, sediment and phosphorus losses in Cambisol treated with swine slurry / O aumento da cobertura vegetal do solo reduz as perdas de água, sedimentos e fósforo em Cambissolo tratado com dejetos suínos

This study aims to evaluate the influence of the ground cover rate bycrop residues and the rain time elapsed after the application of liquid swine slurry (LSS) under losses of water, sediments, and phosphorus (P). The study was carried out under a Humic Cambisols. Two areas were delimited: with and without the applicationof LSS. Each area was subdivided intofour levels of crop residues: 5%, 35%, 65%, and 95%. Vegetable residues present in the area, from corn and black oat, were used. Three collecting gutters of 0.60 m² were installed in each subplot. Simulated rain was carried out on these, and the runoff volume collected for quantification and determination of losses. With LSS application, increase in the cover rate by crop residues reduces 0.3 mm h-1the runoff volume and 1.67 mg m-2reactive soluble P (H2O-P). The sediment lossesin the first collection after the beginning of the rain were 23 times lower in the soil with 95% ground cover than in the soil with 5% ground cover. The loss of total P (total-P) decreases with the increase of the ground cover of the soil and increases inthe same way with the increase of the time.

Este trabalho objetivouavaliar a influência da taxa de cobertura do solo por resíduos culturais e o tempo de chuvadecorrido após a aplicação de dejetoslíquidos de suínos (LSS) sob perdas de água, sedimentos e fósforo (P). O estudo foi realizado sob um Cambissolo Húmico. Duas áreas foram delimitadas: com e sem aplicação de LSS. Cada área foi subdividida em quatro níveis de resíduos culturais: 5%, 35%, 65% e 95%. Foram utilizados resíduos vegetais presentes na área, provenientes de milho e aveia preta. Em cada subparcela foram instaladas três calhas coletoras de 0,60 m². Sobre estes foi realizada chuva simulada, sendo ovolume deenxurrada coletado para quantificação e determinação das perdas. Com a aplicação de LSS, o aumento da taxa de cobertura por resíduos culturais reduziuem 0,3 mm h-1o volume do escoamento e em 1,67 mg m-2de P solúvel reativo (H2O-P). As perdasde sedimento na primeira coleta após o início da chuva foram 23 vezes menores no solo com 95% de cobertura do que no solo com 5% de cobertura. A perda de P total (P total) diminui com o aumento da cobertura do solo e aumenta da mesma forma com o aumento do tempo.

Increased vegetation ground cover reduces water, sediment and phosphorus losses in Cambisol treated with swine slurry / O aumento da cobertura vegetal do solo reduz as perdas de água, sedimentos e fósforo em Cambissolo tratado com dejetos suínos

This study aims to evaluate the influence of the ground cover rate bycrop residues and the rain time elapsed after the application of liquid swine slurry (LSS) under losses of water, sediments, and phosphorus (P). The study was carried out under a Humic Cambisols. Two areas were delimited: with and without the applicationof LSS. Each area was subdivided intofour levels of crop residues: 5%, 35%, 65%, and 95%. Vegetable residues present in the area, from corn and black oat, were used. Three collecting gutters of 0.60 m² were installed in each subplot. Simulated rain was carried out on these, and the runoff volume collected for quantification and determination of losses. With LSS application, increase in the cover rate by crop residues reduces 0.3 mm h-1the runoff volume and 1.67 mg m-2reactive soluble P (H2O-P). The sediment lossesin the first collection after the beginning of the rain were 23 times lower in the soil with 95% ground cover than in the soil with 5% ground cover. The loss of total P (total-P) decreases with the increase of the ground cover of the soil and increases inthe same way with the increase of the time.(AU)

Este trabalho objetivouavaliar a influência da taxa de cobertura do solo por resíduos culturais e o tempo de chuvadecorrido após a aplicação de dejetoslíquidos de suínos (LSS) sob perdas de água, sedimentos e fósforo (P). O estudo foi realizado sob um Cambissolo Húmico. Duas áreas foram delimitadas: com e sem aplicação de LSS. Cada área foi subdividida em quatro níveis de resíduos culturais: 5%, 35%, 65% e 95%. Foram utilizados resíduos vegetais presentes na área, provenientes de milho e aveia preta. Em cada subparcela foram instaladas três calhas coletoras de 0,60 m². Sobre estes foi realizada chuva simulada, sendo ovolume deenxurrada coletado para quantificação e determinação das perdas. Com a aplicação de LSS, o aumento da taxa de cobertura por resíduos culturais reduziuem 0,3 mm h-1o volume do escoamento e em 1,67 mg m-2de P solúvel reativo (H2O-P). As perdasde sedimento na primeira coleta após o início da chuva foram 23 vezes menores no solo com 95% de cobertura do que no solo com 5% de cobertura. A perda de P total (P total) diminui com o aumento da cobertura do solo e aumenta da mesma forma com o aumento do tempo.(AU)

Enfermedad renal crónica y COVID-19: la importancia de la hidratación / Chronic kidney disease and COVID-19: the importance of hydration

Resumen Como es bien sabido, desde el mes de diciembre se encendieron las alarmas por la aparición de la enfermedad COVID-19 (Coronavirus 2019) en China, la cual es causada por el virus SARS-CoV-2 y se ha expandido a nivel mundial. Entre los síntomas frecuentes encontramos fiebre, fatiga, mialgias, tos seca, anorexia, disnea y producción de esputo y síntomas menos comunes como cefalea, odinofagia, rinorrea y otra sintomatología diferente a la respiratoria, como síntomas gastrointestinales dados por náuseas y diarrea. La proteinuria en cualquier grado, la hematuria de cualquier grado, el aumento de la elevación de la creatinina en pacientes con creatinina basal elevada y la generación de AKI 2 y 3 son los directamente relacionados con la mortalidad intrahospitalaria desde el punto de vista renal, lo que hace que debamos estudiar más aun la enfermedad renal crónica, para poder tomar las medidas necesaria de prevención. En cuanto a la hidratación, se considera, por lo tanto, que si el paciente presenta buena diuresis, los 2 litros de excreción serían necesarios para eliminar los solutos no necesarios del cuerpo, considerando que esta cantidad se logra sumando también las pérdidas extrarrenales; entonces, si el paciente mantiene una función urinaria adecuada a pesar de su grado de insuficiencia renal, una ingesta de líquidos entre 2,5 y 3,5 litros logra las metas. Los pacientes con enfermedad renal crónica deben tomar las medidas de prevención, aún más por ser población de riesgo, recordando por lo tanto algunas, las cuales son la mejor estrategia para evitar la transmisión viral: lavado frecuente de manos, distanciamiento social, evitar contacto con personas infectadas o con sospecha de infección por el virus SARS-CoV-2, usar tapabocas, mantener higiene en su domicilio, lavar superficies o limpiarlas con sustancias a base de alcohol, y algo que no se puede olvidar: estamos aprendiendo del virus, y debemos mantenernos informados del comportamiento del mismo y de los cambios que este pueda generar en la población y en el comportamiento de la enfermedad, para así mismo tomar las medidas.

Abstract As is well known since December, alarms went off for the appearance of the COVID-19 disease (Coronavirus 2019) in China, which is caused by the SARS-CoV-2 virus and has spread worldwide. Frequent symptoms include fever, fatigue, myalgia, dry cough, anorexia, dyspnea and sputum production, and less common symptoms such as headache, odynophagia, rhinorrhea, and other symptoms other than breathing, such as gastrointestinal symptoms due to nausea and diarrhea. Proteinuria in any degree, hematuria of any degree, increased creatinine variation in a patient with elevated baseline creatinine, and the generation of AKI 2 and 3 are those directly related to in-hospital mortality from the renal point of view, which means that we must study chronic kidney disease even more, in order to take the necessary preventive measures. Regarding hydration, it is considered, therefore, that if the patient presents good diuresis, the 2 liters of excretion would be necessary to eliminate the unnecessary solutes from the body, considering that this amount is achieved by also adding extrarenal losses. Therefore, if the patient maintains adequate urinary function despite his degree of kidney failure, a fluid intake of between 2.5 and 3.5 liters achieves the goals, also taking into account. Patients with chronic kidney disease should take preventive measures, even more so as they are a risk population, therefore remembering some, which are the best strategy to avoid viral transmission: frequent hand washing, social distancing, avoiding contact with people infected or suspected of infection with the SARS-CoV-2 virus, wearing face masks, maintaining hygiene at home, washing surfaces or cleaning them with alcohol-based substances and something that cannot be forgotten, remember that we are learning from the virus and that we must keep us informed of the behavior of the same and of the changes that it may generate in the population and in the behavior of the disease, so as to take the measures.

Restricted Water Intake and Hydration with Fructose-Containing Beverages during Infancy Predispose to Aggravate an Acute Renal Ischemic Insult in Adolescent Rats.

We aimed to investigate the effects of chronic fluid restriction and hydration with a sweetened beverage (SB) in rats from weaning until adolescence, in a posterior acute kidney injury (AKI) event induced by ischemia-reperfusion (I/R). We followed 5 groups of weaning rats: control group (C); two groups with 22 h/day fluid restriction, a group hydrated for two hours with water (-W) and a group hydrated with SB; one group receiving SB ad libitum all day (+SB); and one group in which water consumption was increased using a gel diet. The rats that reached adolescence were submitted to I/R. Fluid restriction and/or SB hydration induced mild renal alterations that were significantly accentuated in the -SB group and resulted in worse outcomes after I/R-induced AKI that resulted in a catastrophic fall in creatinine clearance and diffuse acute tubular necrosis. In summary, low tap water intakes, as well as SB intake in infancy, prompt kidney worse outcomes in a later event of AKI during adolescence and both insults magnify kidney damage. Studies on hydration habits in children are recommended to disclose the potentially harmful effects that those behavioral patterns might carry to future renal health.

BIOELECTRICAL VECTOR ANALYSIS IN OBESE ADOLESCENTS.

OBJECTIVE: To evaluate the hydration of obese and non-obese adolescents by vectorial bioimpedance analysis, in addition to verifying the associations between obesity and bioelectrical impedance vectorial analysis (BIVA) parameters. METHODS: A cross-sectional study with adolescents between 14 and 18 years old (n=489, 300 boys and 189 girls). Electric bioimpedance (BIA; Quantum_II, RJL system, Rome, Italy) provided resistance and reactance parameters to calculate phase angle (PA), fat-free mass (FFM) and body fat (%BF). The confidence ellipses were compared, and the construction of the tolerance ellipses allowed individual and qualitative evaluation of the vectors and classification in dehydrated, normohydrated and hyperhydrated. RESULTS: 78 obese and 411 eutrophic adolescents participated. Resistance (p<0.001) and reactance (p<0.001) and their normalization by stature (p<0.001) were reduced in the obese, whereas the PA was higher (p=0.003). %BF was 11.3% higher in obese adolescents. The main vector of the obese, both male (D=1.38; p<0.001) and female (D=1.49; p<0.001), indicated greater hydration. The ellipse of tolerance of the total sample showed that 25 (32.1%) were hyperhydrated and 02 (2.6%) vectors positioned in the sense of dehydration. A total of 17 (53.2%) girls and 16 (34.8%) boys were hyperhydrated. Logistic regression showed an inverse relation of BMI with resistance (p<0.001), reactance (p<0.001) and both normalized by stature. Adolescents with increased PA (p<0.001) were twice as likely to present obesity. CONCLUSIONS: Obese adolescents were hyperhydrated and there was an inverse relationship of BMI with resistance and direct with PA.

Association between extracellular volume control and survival in patients on short daily haemodialysis.

BACKGROUND: Fluid overload (FO) assessed by bioimpedance spectroscopy (BIS) is associated with higher mortality risk in maintenance haemodialysis (HD). The aim was to assess if a better management of FO through short daily haemodialysis (SDHD) could improve survival. METHODS: Retrospective analysis of patients who were on HD 3 sessions/week for at least 3 months and shifted to in-centre SDHD (5 or 6 sessions/week, 2 to 3 h/session) between July 2012 and June 2016 at 23 dialysis units in Brazil. The 12-month risk of death was analysed according to the predialysis hydration status measured before and 6 months after initiation of SDHD. Predialysis hydration status was considered adequate when FO ≤15% of extracellular volume. RESULTS: A total of 297 patients on SDHD were included in the analysis. Their median age was 57 (IQR 45-67) years, 62% were males, 44% diabetics, 57% on 6 dialysis sessions/week, with a median session duration of 130 (IQR 120-150) minutes. BIS assessment at initiation of the SDHD regimen was performed in 220 patients and FO > 15% was found in 46.4%. Twelve-month survival rates for those with FO ≤15 and > 15% before initiating SDHD were 87.4 and 88.0%, respectively (P = 0.92). BIS analysis when completing 6 months on SDHD were available for 229 patients, 26.6% with FO > 15%. The survival rates for the next 12 months (from the 6th to the 18th month of follow-up) for those with FO ≤15 and > 15% were 91.0 and 72.0%, respectively (P = 0.0006). In a Cox regression model, after adjustment for demographic, clinical and laboratory variables, FO ≤ 15% persisted associated with a lower mortality risk (hazard ratio 0.34, 95%CI 0.13-0.87). CONCLUSIONS: Moving from conventional HD to SDHD was associated with better control of excessive extracellular volume. Patients who reached or maintained predialysis fluid overload ≤15% after initiating SDHD presented a lower risk of death.

Measurement of skin hydration with a portable device (SkinUp® Beauty Device) and comparison with the Corneometer®.

BACKGROUND: Epidermis hydration measurement is an important tool to assess its health. SkinUp® is a portable device that measures moisture and oil levels of skin through impedance method, it is cheap and has small dimensions, but this equipment has not yet been cited in the scientific literature. Thus, the objective of this work was to validate SkinUp® equipment by comparing its results with Corneometer® CM825. MATERIALS AND METHODS: Twenty subjects had skin hydration measurement on forearm, cheeks, and forehead. Measurements obtained with the two instruments were correlated by calculating the Pearson correlation coefficient and the P-value significance. The sensitivity of the equipment to different regions and treatments and their accuracy were also evaluated. RESULTS: Positive correlations between equipment were found for skin hydration, with P ≤ .001. Both instruments presented high sensitivity to the different treatments (P < .001). When sensitivity to different regions was evaluated, both showed greater hydration in the cheek and forehead when compared to the forearm (P < .005). The measurements between the cheek and forehead showed no significant difference when compared to each other. In addition, the two devices have good repeatability in the measurements. CONCLUSION: These results indicate that SkinUp® can be used in the future for skin analysis in in vivo assays.

The effect of smartphones and playing video games on decision-making in soccer players: A crossover and randomised study.

The objective of this study was to analyse the effect of the use of social networks in smartphones or playing video games on the passing decision-making performance in professional soccer athletes. Participants were 25 male professional soccer athletes (mean ± SD: age 23.4 ± 2.8 years). The participants performed three randomised conditions divided into three groups: control (CON), smartphone (SMA), and video game (VID). Before and after each experimental condition, the Stroop Task assessed the level of induced mental fatigue. Then, the athletes performed a simulated soccer match. A CANON® camera recorded the matches for further analysis on passing decision-making performance. A group effect was identified (p < .01) with impairment on passing decision-making performance for the SMA (p = .01, ES = 0.5) and VID (p = .01, ES = 0.5) conditions. We concluded that the use of social networks on smartphones and/or playing video games right before official soccer matches might impair the passing decision-making performance in professional soccer athletes.

Effect of Ibuprofen on Muscle, Hematological and Renal Function, Hydric Balance, Pain, and Performance During Intense Long-Distance Running.

de Souza, RF, de Matos, DG, Ferreira, ARP, Chilibeck, P, Barros, NdA, de Oliveira, AS, Cercato, LM, da Silva, DS, and Aidar, FJ. Effect of ibuprofen on muscle, hematological and renal function, hydric balance, pain, and performance during intense long-distance running. J Strength Cond Res 34(7): 2076-2083, 2020-The aim of this study was to investigate the effect of prophylactic use of nonsteroidal anti-inflammatory drugs (i.e., ibuprofen) on physical performance, vertical jump, muscle biomarkers, liver, kidney, acute pain, and hydration status of participants in the 42-km Trail Running Challenge, a long-distance race integrated over mountain routes. The sample consisted of 20 men randomly divided into 2 groups: a control group (CG) and an experimental group (EG), with 12 completing the race (41.1 ± 8.8 years; 75.7 ± 12.1 kg) and included in the final analysis. The EG were administered an ibuprofen capsule (400 mg) 15 minutes before the beginning of the race and again after 5 hours of racing if the route was not yet completed. There were significant time main effects for creatine kinase (p = 0.001; f Cohen = 0.25), lactate dehydrogenase (p < 0.001; f Cohen = 2.05), aspartate aminotransferase (p = 0.002; f Cohen = 1.53), creatinine (p = 0.002; f Cohen = 2.24), urea (p = 0.001; f Cohen = 2.25), heart rate (p < 0.001; f Cohen = 4.88), and pain scores (p < 0.001; f Cohen = 1.93) all of which increased during the race. There was a group × time interaction for squat jump, which significantly decreased only in the CG (p = 0.045; f Cohen = 2.17). This may have been related to increased frequency of pain reported after the race in the gastrocnemius of the CG compared with the EG (p ≤ 0.05). It was concluded that ibuprofen intake did not reduce muscle damage during the competition but maintained leg muscular power performance (i.e., vertical jump), possibly by reducing gastrocnemius muscle pain.