Wong S H, Williams C, Adams N
Department of Sports Science and Physical Education, Chinese University of Hong Kong, Shatin, N.T. Hong Kong.
Int J Sport Nutr Exerc Metab. 2000 Dec;10(4):375-93. doi: 10.1123/ijsnem.10.4.375.
This randomized, double-blind study examined the effects of rehydration per se and rehydration plus carbohydrate (CHO) ingestion during recovery (REC) on subsequent endurance running capacity. Nine men ran at 70% VáO2max on a level treadmill for 90 min (T1) on two occasions, followed by a 4 hour REC and a further exhaustive run at the same speed (T2). During the first 3 hours of REC, subjects drank either a 6.9% CHO-electrolyte solution (CE) or a CHO- and electrolyte-free sweetened placebo (PL) every 30 min. Volumes prescribed were 200% of the fluid lost after T1, but the actual volume of fluid ingested during the REC ranged from 113-200% and 88. 5-200% of the body mass lost for the CE and PL trials (NS). However, positive fluid balance was found in both trials after REC. During T2, run time was 24.3 +/- 4.4 min longer in the CE trial (69.3 +/- 5.5 vs. 45.0 +/- 4.2 min; p <.05). Higher blood glucose concentrations were observed throughout REC in the CE trial. These results suggest that ingesting a CHO-electrolyte solution is more effective in restoring endurance capacity compared to the same large volume of placebo, even though complete rehydration was achieved in both trials.
这项随机双盲研究考察了恢复阶段单纯补液以及补液加摄入碳水化合物（CHO）对后续耐力跑能力的影响。九名男性在水平跑步机上以70%的最大摄氧量（VáO2max）跑90分钟（T1），共进行两次，随后是4小时的恢复阶段，接着以相同速度进行一次力竭性跑步（T2）。在恢复阶段的前3小时，受试者每30分钟饮用一次6.9%的碳水化合物电解质溶液（CE）或不含碳水化合物和电解质的甜味安慰剂（PL）。规定的补液量为T1后丢失液体量的200%，但在恢复阶段实际摄入的液体量在CE组和PL组分别为丢失体重的113 - 200%和88.5 - 200%（无显著差异）。然而，恢复阶段后两组均实现了正水平衡。在T2阶段，CE组的跑步时间比PL组长24.3±4.4分钟（69.3±5.5分钟对45.0±4.2分钟；p<.05）。在整个恢复阶段CE组的血糖浓度更高。这些结果表明，与相同大容量的安慰剂相比，摄入碳水化合物电解质溶液在恢复耐力能力方面更有效，尽管两组在试验中均实现了完全补液。
