Glycerol hyperhydration improves cycle time trial performance in hot humid conditions.

S Hitchins, D T Martin, L Burke, K Yates, K Fallon, A Hahn, G P Dobson
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引用次数: 72

Abstract

Eight competitive cyclists [mean peak oxygen consumption, (VO2(peak)) = 65 ml x min(-1) x kg(-1)] undertook two 60-min cycle ergometer time trials at 32 degrees C and 60% relative humidity. The time trials were split into two 30-min phases: a fixed-workload phase and a variable-workload phase. Each trial was preceded by ingestion of either a glycerol solution [1 g x kg(-1) body mass (BM) in a diluted carbohydrate (CHO)-electrolyte drink] or a placebo of equal volume (the diluted CHO-electrolyte drink). The total fluid intake in each trial was 22 ml x kg(-1) BM. A repeated-measures, double blind, cross over design with respect to glycerol was employed. Glycerol ingestion expanded body water by approximately 600 ml over the placebo treatment. Glycerol treatment significantly increased performance by 5% compared with the placebo group, as assessed by total work in the variable-workload phase (P < 0.04). There were no significant differences in rectal temperature, sweat rate or cardiac frequency between trials. Data indicate that the glycerol-induced performance increase did not result from plasma volume expansion and subsequently lower core temperature or lower cardiac frequencies at a given power output as previously proposed. However, during the glycerol trial, subjects maintained a higher power output without increased perception of effort or thermal strain.

甘油高水合作用可改善高温潮湿条件下的循环时间试验性能。
8名竞技自行车运动员[平均峰值耗氧量(VO2(峰值))= 65 ml x min(-1) x kg(-1)]在32℃和60%相对湿度条件下进行了两次60分钟的自行车测力计计时试验。计时赛分为两个30分钟的阶段:固定工作量阶段和可变工作量阶段。每次试验之前,服用甘油溶液[1 g x kg(-1)体重(BM)的稀释碳水化合物(CHO)-电解质饮料]或等量安慰剂(稀释CHO-电解质饮料)。每次试验的总液体摄入量为22 ml × kg(-1) BM。对甘油采用重复测量、双盲交叉设计。甘油摄入使体内水分比安慰剂治疗增加了约600毫升。与安慰剂组相比,甘油治疗显著提高了5%的表现,以可变工作量阶段的总工作量来评估(P < 0.04)。在试验之间,直肠温度、出汗率或心跳频率没有显著差异。数据表明,在给定的功率输出下,甘油诱导的性能提高并不是由血浆体积扩张和随后的核心温度降低或心脏频率降低引起的。然而,在甘油试验期间,受试者保持较高的功率输出,而不增加努力或热应变的感觉。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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