Scheett T P, Webster M J, Wagoner K D
Department of Physical Education, Western Illinois University, Macomb, IL 61455, USA.
Int J Sport Nutr Exerc Metab. 2001 Mar;11(1):63-71. doi: 10.1123/ijsnem.11.1.63.
On two occasions, 8 male subjects completed a dehydration protocol, immediately followed by a 180-min rehydration protocol, then a subsequent exercise bout. During each dehydration session, subjects lost 3.1 +/- 0.4% body weight (BW) following discontinuous exercise in the heat (40 degreesC, 33% rh). During the first 30 min of rehydration, subjects ingested either 1.0-g glycerol x kg body weight(-1) + 30% of the total rehydration water volume (GLY), or 30% of the total rehydration water volume without glycerol (CON). The five remaining ingestions (every 30 min) were equal to 14% of the remaining fluid volume and were identical in nature. Fluid volume ingested equaled fluid volume lost during dehydration. Following the 180 min rehydration period, subjects cycled (appoximately 50% VO2 peak) in the heat (40 degrees C, 33% rh) until volitional exhaustion. Three observations were made: (a) Following glycerol-induced rehydration, time to volitional exhaustion was greater during the subsequent exercise bout in the heat (CON: 38.0 +/- 2.0, GLY 42.8 +/- 1.0 min, p <.05); (b) glycerol-induced rehydration significantly increased plasma volume restoration within 60 min and at the end of the 180-min rehydration period; and (c) total urine volume was lower and percent rehydration was greater following GLY, but neither was significantly different.
在两个不同场合，8名男性受试者完成了脱水方案，紧接着是180分钟的补液方案，随后进行了一次运动试验。在每次脱水过程中，受试者在高温（40℃，相对湿度33%）下进行间断运动后体重减轻了3.1±0.4%（体重）。在补液的前30分钟，受试者摄入了1.0克甘油/千克体重+总补液量的30%（甘油组），或仅摄入总补液量的30%而不含甘油（对照组）。其余五次摄入（每30分钟一次）相当于剩余液体量的14%，且性质相同。摄入的液体量等于脱水过程中丢失的液体量。在180分钟的补液期后，受试者在高温（40℃，相对湿度33%）下进行骑行（约为最大摄氧量的50%），直至自愿疲劳。观察到三个结果：（a）在甘油诱导的补液后，随后在高温下运动试验中达到自愿疲劳的时间更长（对照组：38.0±2.0分钟，甘油组：42.8±1.0分钟，p<0.05）；（b）甘油诱导的补液在60分钟内以及180分钟补液期结束时显著增加了血浆量的恢复；（c）甘油组的总尿量较低，补液百分比更高，但两者均无显著差异。
