González-Alonso J, Heaps C L, Coyle E F
Department of Kinesiology and Health Education, University of Texas, Austin 78712.
Int J Sports Med. 1992 Jul;13(5):399-406. doi: 10.1055/s-2007-1021288.
This study assessed the effectiveness of two common rehydration beverages (a caffeinated diet cola (DC) and a 6% carbohydrate-electrolyte (CE) solution) compared with water (W) for whole body rehydration, gastric emptying and blood volume (BV) restoration during a 2 h rehydration period following exercise-induced dehydration. Subjects (mean VO2max = 4.2 +/- 0.6 l.min-1.min-1; n = 19) exercised at 60-80% VO2max in the heat (32 degrees C; 40% rh) until approximately 2.5% (1.95 +/- 0.12 kg) of their body weight (BW) was lost. After exercise, the subjects sat for 2 h in a thermoneutral environment (21 degrees C; 60% rh) and drank a volume of DC, W and CE equal to the fluid lost. Fluids were consumed in two boluses averaging 1,046 +/- 198 and 912 +/- 186 ml at 0 and 45 min of the 2 h rehydration period, respectively. At the end of the rehydration period, no fluid remained in the stomach during any of the trials as indicated by epigastric impedance. However, in all the trials the subjects were somewhat hypohydrated (range 0.6-0.9 kg BW below euhydrated BW; p less than 0.05) after the 2 h rehydration period since additional water and BW were lost as a result of urine formation, respiration, sweat and metabolism. The percentage of body weight loss that was regained (used as an index of % rehydration) during DC (54 +/- 5%) was significantly lower than that of W and CE (64 +/- 5% and 69 +/- 5%, respectively; p less than 0.05; n = 10).(ABSTRACT TRUNCATED AT 250 WORDS)
本研究评估了两种常见补液饮料（含咖啡因的健怡可乐（DC）和6%碳水化合物-电解质（CE）溶液）与水（W）相比，在运动诱导脱水后的2小时补液期内对全身补液、胃排空和血容量（BV）恢复的效果。受试者（平均最大摄氧量=4.2±0.6升·分钟⁻¹；n=19）在热环境（32℃；40%相对湿度）中以60 - 80%最大摄氧量运动，直至体重（BW）减轻约2.5%（1.95±0.12千克）。运动后，受试者在热中性环境（21℃；60%相对湿度）中静坐2小时，并饮用与丢失液体量相等的DC、W和CE。在2小时补液期的0和45分钟时，分两次饮用液体，平均量分别为1046±198毫升和912±186毫升。补液期结束时，上腹部阻抗显示所有试验中胃内均无液体残留。然而，在所有试验中，2小时补液期后受试者仍处于轻度脱水状态（体重比正常水合体重低0.6 - 0.9千克；p<0.05），因为由于尿液生成、呼吸、出汗和新陈代谢，额外的水分和体重有所丢失。DC组体重恢复的百分比（用作补液百分比指标）（54±5%）显著低于W组和CE组（分别为64±5%和69±5%；p<0.05；n = 10）。（摘要截断于250字）
