Wimer G S, Lamb D R, Sherman W M, Swanson S C
Division of Health and Physical Education, Armstrong Atlantic State University, Savannah, GA 31419-1997, USA.
Can J Appl Physiol. 1997 Oct;22(5):479-93. doi: 10.1139/h97-031.
The effect of the temperature of ingested water on the rise in core temperature (Tco) during exercise is not clear. Seven trained subjects were recruited to complete 2 hr of recumbent cycling at 51% VO2peak in a temperate environment (Ta = 26 degrees C, relative humidity = 40%) on four occasions, while ingesting either no fluid (trial NF26), cold water (0.5 degree C; trial CD26), cool water (19 degrees C; trial CL26), or warm water (38 degrees C; trial WA26) during the second hour of exercise. A fifth trial was conducted during which convective and radiative heat loss were reduced by raising Ta to 31 degrees C. During this trial, subjects ingested cold water (0.5 degree C; trial CD31). When compared to WA26, over the second hour of exercise, CD26 attenuated the time-averaged changes in (Tco) and forearm blood flow and decreased whole-body sweat rate and forearm sweat rate (p < .05). Similarly, relative to WA26, the CL26 trial attenuated the time-averaged changes in Tco and reduced whole-body sweat rate (p < .05) during the second hour of exercise, but CL26 had no significant effect on forearm sweat rate or blood flow. Finally, regardless of beverage temperature, water ingestion (vs. NF26) reduced the time-averaged changes in Tco and in heat storage during the second hour of exercise (p < .05).
摄入水的温度对运动期间核心体温（Tco）升高的影响尚不清楚。招募了7名训练有素的受试者，在温带环境（Ta = 26摄氏度，相对湿度 = 40%）下，以51%的最大摄氧量进行4次2小时的卧式骑行，在运动的第二个小时期间，分别不摄入液体（试验NF26）、摄入冷水（0.5摄氏度；试验CD26）、凉水（19摄氏度；试验CL26）或温水（38摄氏度；试验WA26）。进行了第五次试验，在此试验中，通过将Ta提高到31摄氏度来减少对流和辐射热损失。在此试验期间，受试者摄入冷水（0.5摄氏度；试验CD31）。与试验WA26相比，在运动的第二个小时期间, 试验CD26减弱了（Tco）和前臂血流量的时间平均变化，并降低了全身出汗率和前臂出汗率（p < 0.05）。同样，相对于试验WA26，试验CL26在运动的第二个小时期间减弱了Tco的时间平均变化并降低了全身出汗率（p < 0.05），但试验CL26对前臂出汗率或血流量没有显著影响。最后，无论饮料温度如何，摄入水（与试验NF26相比）在运动的第二个小时期间减少了Tco和热量储存的时间平均变化（p < 0.05）。
