Pre-game hydration status, sweat loss, and fluid intake in elite Brazilian young male soccer players during competition

Silva, Rafael P. Da; Mündel, Toby; Natali, Antônio José; Filho, Maurício Gattás Bara; Alfenas, R. C.; Lima, Jorge Roberto Perrout de; Belfort, Felipe G.; Lopes, Priscila R. N. R.; Marins, João Carlos Bouzas

doi:10.1080/02640414.2011.623711

Cited by 43 publications

(64 citation statements)

References 22 publications

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“…The data collected in the current study align with previous studies suggesting young athletes arrive to competition underhydrated (Arnaoutis et al, 2015;Arnaoutis et al, 2013;Da Silva et al, 2012;Yeargin et al, 2010). On day 3 and day 4 of the competition sailors arrived with USG greater than 1.020, a value indicative of suboptimal hydration (Sawka et al, 2007 (McDermott et al, 2009).…”

Section: Discussionsupporting

confidence: 80%

Progressive Dehydration in Junior Laser Class Sailors During World Championship

Arnaoutis

Verginadis

Seal

et al. 2018

International Journal of Sport Nutrition and Exercise Metabolism

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The purpose of this manuscript is to assess hydration status of elite young sailing athletes during World Championship competition. 12 young elite male Laser Class sailors (age: 15.8±1.1 y, height: 1.74±0.1 m, weight: 65.1±1.5 kg, body fat: 12.5±3.1%, training experience: 7.0±1.2 y) participated in this descriptive study. After three-day baseline bodyweight measurements, hydration status was assessed via pre-and post-race body weights, urine specific gravity, and thirst ratings via a visual analog scale during 4 consecutive days of racing.Measurements and data collection took place at the same time each racing day, with mean environmental temperature, humidity, and wind speed at 23.0±0.8 o C, 64-70% and 9±1 knots, respectively. Average racing time was 130±9 min. Body weight was significantly decreased following each race-day as compared to pre-race values (day 1: -1.1±0.2, day 2: -2.5±0.1, day 3: -2.8±0.1, and day 4: -3.0±0.1% of body weight; P<0.05). The participants exhibited dehydration of -2.9±0.2 and -5.8±0.2% of body weight before and after the 4th racing day as compared to the 3-day baseline body weight. Urine specific gravity (pre -post  day 1:1.014-1.017; day 2: 1.019-1.024; day 3: 1.021-1.026; day 4: 1.022-1.027) and thirst (pre -post  day 1: 2.0-5.2; day 2: 3.2-5.5; day 3: 3.7-5.7; day 4: 3.8-6.8) were also progressively and significantly elevated throughout the four days of competition. The data revealed progressive dehydration throughout four consecutive days of racing as indicated by decreased body weight, elevated urine concentration, and high thirst.

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Section: Discussionsupporting

confidence: 80%

Progressive Dehydration in Junior Laser Class Sailors During World Championship

Arnaoutis

Verginadis

Seal

et al. 2018

International Journal of Sport Nutrition and Exercise Metabolism

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“…Para ello se estudió la diferencia del peso antes y después del partido, la ingesta de líquido durante y la gravedad específica de la orina. Se determinó que los jugadores únicamente reemplazaron el 50% de la pérdida de agua corporal por sudoración por lo que sería necesario estrategias para mejorar la reposición de agua corporal para los jugadores que compiten en ambientes calurosos 7 . En otra investigación se evaluó el estado previo de hidratación y el balance hí-drico en 107 jugadores con unas condiciones ambientales de 27,2±2°C y 57±9% de humedad relativa donde se analizó el estado de hidratación a través del color y de la gravedad específica de la orina y a partir de cambios en el peso 8 .…”

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Balance hídrico y consumo de agua ad libitum en futbolistas durante el entrenamiento

Hernández-Camacho¹,

Moya-Amaya²

2016

Rev Esp Nutr Hum Diet

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Introducción: Se conoce que la hidratación juega un papel crucial en el desempeño deportivo. Pero un gran número de estudios que evalúan la hidratación durante la práctica de fútbol han demostrado que gran cantidad de jugadores presentan un estado de deshidratación previo a la práctica de este deporte y que la mayoría de los futbolistas no son capaces de reponer la pérdida de agua por sudoración con la ingesta ad libitum.Objetivos: Analizar el consumo de agua ad libitum, el balance hídrico, la sensación de sed y la tasa de esfuerzo percibido en una muestra juvenil de jugadores de fútbol durante una sesión de entrenamiento.Material y Métodos: 57 jugadores de tres equipos de la categoría juvenil de la cantera de un club de fútbol participaron voluntariamente en el estudio mediante la recogida del peso al inicio y al final del entrenamiento, la sensación de sed, la tasa de esfuerzo percibido y la cuantificación del agua ingerida. Se utilizaron estadísticos descriptivos, correlaciones y análisis de proporciones.Resultados: La ingesta media del global de futbolistas estudiados fue 844,74±351,95mL y la pérdida media de agua corporal de 1274,56±385,82mL. Una tasa de deshidratación media respecto al peso inicial del 0,63%. Se obtuvo una puntuación media de 2,81±1,32 en la escala de sensación de sed. Discusión y conclusiones:Se obtienen tasas de pérdida de agua corporal similares a estudios previos. Los futbolistas no fueron capaces de reponer la pérdida de agua mediante la ingesta de líquido ad libitum, por lo que la ingesta de una cantidad pautada previamente podría llegar a ser de gran ayuda. PALABRAS CLAVE

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“…It has been noted that commercial sports drinks have similar hydration ability to water [16]. Previous studies that have examined fluid balance or assessed sweat rates investigated the effect of water versus sports drink consumption during exercise in the heat of tennis [17] and soccer players [18]. To the knowledge of the investigators, there have been no published studies which have compared the hydration ability of different formulation sports drinks against water and no drink.…”

Section: Introductionmentioning

confidence: 87%

Effectiveness of Commercial versus Homemade Sports Drinks on Fluid Balance and Exercise Capacity during High-intensity Intermittent Exercise

Begum¹,

Konstantaki²,

Cunliffe³

et al. 2015

AJSSM

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Commercial sports drinks are used widely by athletes involved in high-intensity intermittent (HII) exercise. However, little has been reported on their relative effectiveness compared to simple homemade drink formulations. The purpose of this study was to investigate the effects of different sports drink formulations (commercial v homemade), water and no drink on fluid balance and exercise capacity during HII exercise. Twelve trained men (age: 27 ± 2.1 y) performed a 90-min HII running protocol designed to simulate activity experienced during a football match. The protocol was arranged in six 15-min stages where running speeds ranged between 55% and 120% of VO 2max . The HII protocol included half-time and a run to fatigue post 90 min. Using a single-blind, randomized, cross-over design, participants ingested a preload of 5 ml⋅kg -1 10 min before HII exercise and 3 ml⋅kg -1 every 15 min of either Isostar® (ISO), a homemade sports drink (CHO), placebo (P) or no drink (ND). Blood lactate (Hla), blood glucose (B gluc ), heart rate (HR) and ratings of perceived exertion (RPE) were measured before, during (every 15 min) and after the 90-min HII protocol. Changes in plasma volume were measured at half-time and post 90 min. Sweat rate and fluid balance were calculated post each trial. Time to fatigue (TTF) was recorded at exhaustion. In the ND trial, TTF decreased by approximately 17%, 28% and 43% compared to P, CHO and ISO, respectively (p<0.01) and HR was highest at 90 min following ND trial (p<0.05). TTF was 20% longer in the ISO trial compared to CHO, but this difference was not statistically significant (p>0.05). No differences were noted in HLa, RPE, PV or SR between the trials (p>0.05) but there were significant effects of time (p<0.05). B gluc peaked at 30 minutes in ISO and CHO, but dropped by ~27% in ISO and by ~30% in CHO after half time. Absence of fluid ingestion surprisingly had no significant effect on altering plasma volume or decreasing sweat rate despite causing noticeable decreases in exercise capacity. The homemade drink improved exercise capacity in a similar manner to that of the commercial drink, but neither sports drink achieved superior hydration compared to water. Ingestion of exogenous carbohydrate through sports drink consumption caused an exercise-induced glycemic response when exercise was restarted after half-time. This decline in blood glucose after half-time appears to be marginally attenuated in P trial. A possible suggestion for team sports could be to drink water rather than sports drink prior to half-time period.

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Pre-game hydration status, sweat loss, and fluid intake in elite Brazilian young male soccer players during competition

Cited by 43 publications

References 22 publications

Progressive Dehydration in Junior Laser Class Sailors During World Championship

Progressive Dehydration in Junior Laser Class Sailors During World Championship

Balance hídrico y consumo de agua ad libitum en futbolistas durante el entrenamiento

Effectiveness of Commercial versus Homemade Sports Drinks on Fluid Balance and Exercise Capacity during High-intensity Intermittent Exercise

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