Bergeron M F, Waller J L, Marinik E L
Department of Physical Therapy, Medical College of Georgia, Augusta, GA 30912-0800, USA.
Br J Sports Med. 2006 May;40(5):406-10. doi: 10.1136/bjsm.2005.023333.
To examine differences in ad libitum fluid intake, comparing a 6% carbohydrate/electrolyte drink (CHO-E) and water, and associated differences in core temperature and other selected physiological and perceptual responses in adolescent athletes during tennis training in the heat.
Fourteen healthy, fit, young tennis players (nine male; five female; mean (SD) age 15.1 (1.4) years; weight 60.6 (8.3) kg; height 172.8 (8.6) cm) completed two 120 minute tennis specific training sessions on separate days (randomised, crossover design) in a warm environment (wet bulb globe temperature: CHO-E, 79.3 (2.6) degrees F; water, 79.9 (2.2) degrees F; p>0.05).
There were no significant differences (p>0.05) between the trials with respect to fluid intake, urine volume, fluid retention, sweat loss, perceived exertion, thirst, or gastrointestinal discomfort. However, there was a difference (p<0.05) in the percentage body weight change after training (CHO-E, -0.5 (0.7)%; water, -0.9 (0.6)%). Urine specific gravity before training (CHO-E, 1.024 (0.006); water, 1.025 (0.005)) did not correlate significantly (p>0.05) with any of these measurements or with core body temperature. In examining the main effect for trial, the CHO-E trial showed a significantly lower (p<0.001) mean body temperature (irrespective of measurement time) than the water trial. However, the mean body temperature in each trial was not associated (p>0.05) with fluid intake, fluid retention, sweat loss, or percentage body weight change.
Ad libitum consumption of a CHO-E drink may be more effective than water in minimising fluid deficits and mean core temperature responses during tennis and other similar training in adolescent athletes.
比较6%碳水化合物/电解质饮料（CHO-E）和水在随意液体摄入量方面的差异，以及在炎热环境下青少年运动员进行网球训练时核心体温及其他选定的生理和感知反应的相关差异。
14名健康、体能良好的年轻网球运动员（9名男性；5名女性；平均（标准差）年龄15.1（1.4）岁；体重60.6（8.3）千克；身高172.8（8.6）厘米）在温暖环境中于不同日期完成了两次120分钟的网球专项训练课程（随机交叉设计）（湿球黑球温度：CHO-E组，79.3（2.6）华氏度；水组，79.9（2.2）华氏度；p>0.05）。
在液体摄入量、尿量、液体潴留、汗液流失、主观用力感觉、口渴或胃肠道不适方面，各试验之间无显著差异（p>0.05）。然而，训练后体重变化百分比存在差异（p<0.05）（CHO-E组，-0.5（0.7）%；水组，-0.9（0.6）%）。训练前尿比重（CHO-E组，1.024（0.006）；水组，1.025（0.005））与这些测量值中的任何一个以及核心体温均无显著相关性（p>0.05）。在检查试验的主要效应时，CHO-E试验显示平均体温（无论测量时间）显著低于水试验（p<0.001）。然而，各试验中的平均体温与液体摄入量、液体潴留、汗液流失或体重变化百分比均无相关性（p>0.05）。
在青少年运动员进行网球及其他类似训练期间，随意饮用CHO-E饮料在使液体缺失和平均核心体温反应最小化方面可能比水更有效。
