Murray R, Eddy D E, Murray T W, Seifert J G, Paul G L, Halaby G A
Exercise Physiology Laboratory, John Stuart Research Laboratories, Quaker Oats Company, Barrington, IL 60010.
Med Sci Sports Exerc. 1987 Dec;19(6):597-604.
The purpose of this study was to determine the effect of ingesting water or carbohydrates solutions on physiologic function and performance during 1.6 h of intermittent cycling exercise in the heat (dry bulb temperature = 33 degrees C). Thirteen male subjects (24 to 35 yr) completed four separate rides. Each ride consisted of intermittent steady-state cycling (at 55 and 65% VO2max) interspersed with five rest periods. A timed 480 revolution cycling task completed each experimental session. During each rest period, subjects consumed 2 ml.kg-1 body weight of water placebo or solutions of 5% glucose polymer, 6% sucrose/glucose, or 7% glucose polymer/fructose. Beverages were administered in double-blind, counter-balanced order. No differences were observed among subjects in response to beverage treatments for changes in plasma concentrations of total proteins, sodium, potassium, lactate, or in osmolality, percent change in plasma volume, heart rate, oxygen uptake, respiratory exchange ratio, rating of perceived exertion, sweat rate, rectal temperature, or mean skin temperature. Compared to water placebo, the carbohydrate treatments produced higher plasma glucose values following 1 h cycling (P less than 0.01). Mean (SD) times for the 480 revolution cycling task: water placebo = 432 (43) s; glucose polymer = 401 (52) s; *sucrose/glucose = 384 (39) s; and *glucose polymer/fructose = 375 (30) s, where = P less than 0.001 compared to water placebo. Physiologic function was similarly maintained during exercise by all beverage treatments, while ingestion of sucrose/glucose and glucose polymer/fructose resulted in improved end-exercise cycling performance.
本研究的目的是确定在热环境（干球温度 = 33摄氏度）下进行1.6小时间歇性自行车运动期间，摄入水或碳水化合物溶液对生理功能和运动表现的影响。13名男性受试者（24至35岁）完成了四次单独骑行。每次骑行包括间歇性稳态骑行（在55%和65%最大摄氧量下），其间穿插五个休息期。每次实验环节都完成一项限时480转的自行车任务。在每个休息期，受试者饮用2毫升/千克体重的水安慰剂或5%葡萄糖聚合物、6%蔗糖/葡萄糖或7%葡萄糖聚合物/果糖溶液。饮料以双盲、平衡顺序给予。在总蛋白、钠、钾、乳酸的血浆浓度变化或渗透压、血浆量百分比变化、心率、摄氧量、呼吸交换率、主观用力感觉评分、出汗率、直肠温度或平均皮肤温度方面，未观察到受试者对饮料处理的反应存在差异。与水安慰剂相比，碳水化合物处理在骑行1小时后产生了更高的血浆葡萄糖值（P < 0.01）。480转自行车任务的平均（标准差）时间：水安慰剂 = 432（43）秒；葡萄糖聚合物 = 401（52）秒；*蔗糖/葡萄糖 = 384（39）秒；*葡萄糖聚合物/果糖 = 375（30）秒，其中与水安慰剂相比P < 0.001。所有饮料处理在运动期间同样维持了生理功能，而摄入蔗糖/葡萄糖和葡萄糖聚合物/果糖提高了运动结束时的自行车运动表现。
