Hashimoto Yoshiaki, Watanabe Nobuko, Futamura Azusa
Department of Internal Medicine, Ageo Central General Hospital, Ageo.
Rinsho Byori. 2007 Nov;55(11):1015-8.
In 7 men and 5 women, we measured the amounts of sweat and fluid intake, and the ionic composition of sweat during a 3-hour badminton practice in summer. The amount of sweat was calculated as follows; body weight before practice (g)--body weight after practice (g)--urine volume (ml) +fluid intake (ml). We collected sweat by covering the non-dominant forearm with a plastic bag. The amounts of sweat and fluid intake during the 3-hour practice were 1809 +/- 715ml (mean +/- SD) and 658 +/- 344ml, respectively. Weight loss after the practice was 2.0 +/- 0.9% of their weight before the practice. The Na(+) and Cl(-) levels of the sweat about 30 min after the start of practice were 66 +/- 34 mEq/l and 54 +/- 32mEq/l, respectively. There was no significant difference between those ionic levels of the sweat about 30 min after the start of practice and those about 30 min before the end of practice. The sum of Na(+) and Cl(-) loss into sweat during a 3-hour practice session was supposed to be 6.9 +/- 5.3g, and to be above 10 g in 4 of 7 men, assuming that there were no regional differences in the ionic composition of sweat. The findings suggested that most of the participants should take more fluid and some of them might need salt intake during the practice.
在7名男性和5名女性中，我们测量了夏季3小时羽毛球练习期间的出汗量、液体摄入量以及汗液的离子成分。出汗量的计算方法如下：练习前体重（克）-练习后体重（克）-尿量（毫升）+液体摄入量（毫升）。我们用塑料袋覆盖非优势前臂来收集汗液。3小时练习期间的出汗量和液体摄入量分别为1809±715毫升（平均值±标准差）和658±344毫升。练习后的体重减轻为练习前体重的2.0±0.9%。练习开始约30分钟后汗液中的Na⁺和Cl⁻水平分别为66±34毫当量/升和54±32毫当量/升。练习开始约30分钟后汗液的离子水平与练习结束前约30分钟的离子水平之间没有显著差异。假设汗液的离子成分不存在区域差异，那么在3小时练习期间汗液中Na⁺和Cl⁻的损失总量应为6.9±5.3克，7名男性中有4人的损失量超过10克。研究结果表明，大多数参与者在练习期间应补充更多液体，其中一些人可能需要摄入盐分。
