水中歩行運動時における摂取飲料の違いが尿生成および発汗による体液損失に与える影響

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In this study, we aimed to compare the effects of isotonic-fluid and water intake during underwater walking on body fluid loss occurring through urine production and perspiration. We also compared the groups for the intra-bladder urine volume, which was measured using a portable three dimensional ultrasound scanning device and sampled urine volume. Seven healthy men (age: 21.1±1.0 years, height: 170.7±4.9cm, weight: 65.5±7.3kg) were assigned to 3 groups: water intake (WA: 450ml), sports drink intake (SD: 450ml), and no water intake (NO) groups. The length and depth of the pool were 25m and 1.0m, respectively. The participants were instructed to walk at a speed of 3km/h for 1,750m in the pool maintained at a temperature of 29.9±0.5℃, the room temperature was 30.2±0.9℃, and the relative humidity was 82.7±3.3%. We measured the urine volume, amount of body fluid lost as sweat, heart rate, tympanic temperature, and blood pressure during the exercise. The tympanic temperature significantly increased during the exercise in all the 3 groups, but the difference was not significant. In all the 3 groups, the systolic blood pressure (SBP) and the diastolic blood pressure (DBP) did not differ during the exercise. There was no difference in the amount of sweat, urine volume, and total fluid loss among the 3 groups. There was a high correlation between the sampled urine volume and urine production, which was evaluated using the intra-bladder urine volume (r=0.972, p<0.01). We concluded that there was no difference in the body temperature, SBP, DBP, and body fluid loss between the fluid intake (WA and SD) and NO groups and between the WA and SD groups under the conditions used in this study. Moreover, sampled urine volume was found to be a valid measure of urine production during underwater walking.
2010-03-31

水中歩行運動時における摂取飲料の違いが尿生成および発汗による体液損失に与える影響

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