BACKGROUND: Loss of body mass during a 24-h run was considered to be a result of dehydration.\ud\udAIMS: We intended to quantify the decrease in body mass as a loss in fat mass or skeletal muscle mass and to quantify the change in hydration status.\ud\udMETHODS: Body mass, fat mass, skeletal muscle mass, haematocrit, plasma sodium and urinary specific gravity were measured in 15 ultra-marathoners in a 24-h run.\ud\udRESULTS: Body mass decreased by 2.2 kg (p = 0.0009) and fat mass decreased by 0.5 kg (p = 0.0084). The decrease in body mass correlated to the decrease in fat mass (r = 0.72, p = 0.0024). Urinary specific gravity increased from 1.012 to 1.022 g/mL (p = 0.0005).\ud\udCONCLUSIONS: The decrease in body mass and the increase in urinary specific gravity indicate dehydration. The decrease in body mass was correlated to the decrease in fat mass and therefore not only due to dehydration.
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机译：背景：24小时跑步期间体重下降被认为是脱水的结果。\ ud \ ud目标：我们打算将体重下降量化为脂肪或骨骼肌质量下降，并量化其变化方法：在24小时内对15名超级马拉松运动员的体重，脂肪，骨骼肌质量，血细胞比容，血浆钠和尿比重进行了测量。\ ud \ ud结果： 2.2千克（p = 0.0009），脂肪减少了0.5千克（p = 0.0084）。体重的减少与脂肪的减少相关（r = 0.72，p = 0.0024）。尿比重从1.012 g / mL增加到1.022 g / mL（p = 0.0005）。结论：体重下降和尿比重增加表明脱水。体重的减少与脂肪的减少相关，因此不仅是由于脱水引起的。
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