Centre of Excellence for Applied Sport Science Research, Queensland Academy of Sport, Brisbane, Australia.
Eur J Appl Physiol. 2010 Dec;110(6):1163-73. doi: 10.1007/s00421-010-1607-3. Epub 2010 Aug 17.
We compared the effects of an ice-slush beverage (ISB) and a cool liquid beverage (CLB) on cycling performance, changes in rectal temperature (T (re)) and stress responses in hot, humid conditions. Ten trained male cyclists/triathletes completed two exercise trials (75 min cycling at ~60% peak power output + 50 min seated recovery + 75% peak power output × 30 min performance trial) on separate occasions in 34°C, 60% relative humidity. During the recovery phase before the performance trial, the athletes consumed either the ISB (mean ± SD -0.8 ± 0.1°C) or the CLB (18.4 ± 0.5°C). Performance time was not significantly different after consuming the ISB compared with the CLB (29.42 ± 2.07 min for ISB vs. 29.98 ± 3.07 min for CLB, P = 0.263). T (re) (37.0 ± 0.3°C for ISB vs. 37.4 ± 0.2°C for CLB, P = 0.001) and physiological strain index (0.2 ± 0.6 for ISB vs. 1.1 ± 0.9 for CLB, P = 0.009) were lower at the end of recovery and before the performance trial after ingestion of the ISB compared with the CLB. Mean thermal sensation was lower (P < 0.001) during recovery with the ISB compared with the CLB. Changes in plasma volume and the concentrations of blood variables (i.e., glucose, lactate, electrolytes, cortisol and catecholamines) were similar between the two trials. In conclusion, ingestion of ISB did not significantly alter exercise performance even though it significantly reduced pre-exercise T(re) compared with CLB. Irrespective of exercise performance outcomes, ingestion of ISB during recovery from exercise in hot humid environments is a practical and effective method for cooling athletes following exercise in hot environments.
我们比较了冰沙饮料（ISB）和清凉饮料（CLB）对热湿环境下自行车运动表现、直肠温度（T(re)）变化和应激反应的影响。10 名训练有素的男性自行车运动员/三项全能运动员在 34°C、60%相对湿度的条件下，分别在两次不同的运动试验中完成了 75 分钟的自行车运动（约 60%的峰值功率输出+50 分钟的坐姿恢复+75%峰值功率输出×30 分钟的运动试验）。在运动试验前的恢复期，运动员分别饮用 ISB（平均±SD-0.8±0.1°C）或 CLB（18.4±0.5°C）。与 CLB 相比，饮用 ISB 后运动表现时间无显著差异（ISB 为 29.42±2.07 分钟，CLB 为 29.98±3.07 分钟，P=0.263）。与 CLB 相比，ISB 可使 T(re)（ISB 为 37.0±0.3°C，CLB 为 37.4±0.2°C，P=0.001）和生理应激指数（ISB 为 0.2±0.6，CLB 为 1.1±0.9，P=0.009）在恢复期结束和运动试验前降低。与 CLB 相比，ISB 可使恢复期的平均热感觉更低（P<0.001）。两次试验之间，血浆容量和血液变量（即葡萄糖、乳酸、电解质、皮质醇和儿茶酚胺）的浓度变化相似。总之，与 CLB 相比，即使 ISB 明显降低了运动前的 T(re)，但对运动表现并没有显著影响。无论运动表现结果如何，在热湿环境中运动后的恢复期摄入 ISB 是一种实用且有效的冷却运动员的方法。
