Change in body mass accurately and reliably predicts change in body water after endurance exercise
Change in body mass accurately and reliably predicts change in body water after endurance exercise
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DOI：
10.1007/s00421-009-0982-0
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发表时间：
2009-04-01
影响因子：
3
通讯作者：
Kenney, W. Larry
中科院分区：
文献类型：
--
作者：
Baker, Lindsay B.;Lang, James A.;Kenney, W. Larry
这项研究验证了这样的假设，即身体质量(Delta BM)的变化准确地反映了长期运动后全身水分(Delta TBW)的变化。受试者(男4人，女4人；年龄22~36岁；66+/-A 10 kg)在高温(30A℃)下完成2小时间歇跑(70%最大摄氧量)，然后跑至精疲力竭(85%最大摄氧量)，然后静坐1h恢复期。在锻炼和恢复期间，受试者在不同的试验中喝液体或不喝液体来维持他们的BM，增加2%的BM，或减少2%或4%的BM。实验前后用氧化氢(D2O)稀释法测定TBW，校正尿液、汗液、呼吸水蒸气和非水氢交换中的D2O损失。Delta BM与Delta TBW的平均差值为0.07+/-A 1.07 kg(配对t检验，P=0.29)。Delta BM和Delta TBW之间关系的斜率和截距分别与1和0没有显著差异。Delta BM和Delta TBW的组内相关系数为0.76，表明两种方法之间具有良好的可靠性。运动前后测量Delta BM是一种准确、可靠的评估Delta TBW的方法。
This study tested the hypothesis that the change in body mass (Delta BM) accurately reflects the change in total body water (Delta TBW) after prolonged exercise. Subjects (4 men, 4 women; 22-36 year; 66 +/- A 10 kg) completed 2 h of interval running (70% VO2max) in the heat (30A degrees C), followed by a run to exhaustion (85% VO2max), and then sat for a 1 h recovery period. During exercise and recovery, subjects drank fluid or no fluid to maintain their BM, increase BM by 2%, or decrease BM by 2 or 4% in separate trials. Pre- and post-experiment TBW were determined using the deuterium oxide (D2O) dilution technique and corrected for D2O lost in urine, sweat, breath vapor, and nonaqueous hydrogen exchange. The average difference between Delta BM and Delta TBW was 0.07 +/- A 1.07 kg (paired t test, P = 0.29). The slope and intercept of the relation between Delta BM and Delta TBW were not significantly different from 1 and 0, respectively. The intraclass correlation coefficient between Delta BM and Delta TBW was 0.76, which is indicative of excellent reliability between methods. Measuring pre- to post-exercise Delta BM is an accurate and reliable method to assess the Delta TBW.