Abstract
BackgroundThe negative effects of dehydration on aerobic activities are well established. However, it is unknown how dehydration affects intermittent sports performance. The purpose of this study was to identify the level of dehydration in elite badminton players and its relation to muscle strength and power production.MethodologySeventy matches from the National Spanish badminton championship were analyzed (46 men’s singles and 24 women’s singles). Before and after each match, jump height and power production were determined during a countermovement jump on a force platform. Participants’ body weight and a urine sample were also obtained before and after each match. The amount of liquid that the players drank during the match was also calculated by weighing their individual drinking bottles.Results and DiscussionSweat rate during the game was 1.14±0.46 l/h in men and 1.02±0.64 l/h in women. The players rehydrated at a rate of 1.10±0.55 l/h and 1.01±0.44 l/h in the male and female groups respectively. Thus, the dehydration attained during the game was only 0.37±0.50% in men and 0.32±0.83% in women. No differences were found in any of the parameters analyzed during the vertical jump (men: from 31.82±5.29 to 32.90±4.49 W/kg; p>0.05, women: from 26.36±4.73 to 27.25±4.44 W/kg; p>0.05). Post-exercise urine samples revealed proteinuria (60.9% of cases in men and 66.7% in women), leukocyturia (men = 43.5% and women = 50.0%) and erythrocyturia (men = 50.0% and women = 21.7%).ConclusionsDespite a moderate sweat rate, badminton players adequately hydrated during a game and thus the dehydration attained was low. The badminton match did not cause muscle fatigue but it significantly increased the prevalence of proteinuria, leukocyturia and erythrocyturia.
Highlights
The negative effects of dehydration on endurance sports have been widely demonstrated [1]
Despite a moderate sweat rate, badminton players adequately hydrated during a game and the dehydration attained was low
The results obtained in the variables analyzed for the countermovement jumps (CMJ) and hand grip strength tests are shown in Figures 1 and 2
Summary
The negative effects of dehydration on endurance sports have been widely demonstrated [1]. While some studies indicate that dehydration does not affect short-term muscle performance [4,5] other investigations have found a detrimental effect of dehydration on maximal force production [6] and highintensity cycling performance [7], especially when dehydration is accompanied by hyperthermia. Judelson et al [8] indicate that dehydration has a greater influence the longer the exercise lasts. These authors indicate that a reduction of 3–4% of body mass can reduce muscle strength by 2%, muscle power by 3% and muscle endurance during efforts of between 30 and 120 seconds by 10%. The negative effects of dehydration on aerobic activities are well established It is unknown how dehydration affects intermittent sports performance. The purpose of this study was to identify the level of dehydration in elite badminton players and its relation to muscle strength and power production
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