Whole-body pre-cooling and heat storage during self-paced cycling performance in warm humid conditions
Whole-body pre-cooling and heat storage during self-paced cycling performance in warm humid conditions
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DOI：
10.1080/026404199365326
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发表时间：
1999-12-01
影响因子：
3.4
通讯作者：
Marino, FE
中科院分区：
文献类型：
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作者：
Kay, D;Taaffe, DR;Marino, FE
本研究的目的是确定在温暖潮湿（31摄氏度和60%相对湿度）条件下，预冷皮肤而不伴随核心温度降低对随后的自行车性能的影响。七名受过中等训练的男性在两个不同的场合进行了30分钟的自行车试验。这些条件作为对照或通过水浸进行全身预冷来平衡，使得静息皮肤温度降低约5-6 ℃。预冷后，运动过程中平均皮肤温度较低，运动15 ~ 25 min直肠温度较低（P < 0.05）。因此，储热从84.0 +/- 8.8 W增加（P < 0.003）。m（-2）至153 +/- 13.1 W。m（-2）（平均值+/- s（（x）/bar）），而全身汗液从1.7 +/-0.11. h（-1）至1.2 +/-0.11。h（-1）（P < 0.05）。预冷后，循环距离从14.9 +/- 0.8增加到15.8 +/- 0.7 km（P < 0.05）。结果表明，在没有降低直肠温度的情况下，皮肤预冷在减少热应变和增加在温暖潮湿条件下30分钟内循环的距离方面是有效的。
The aim of this study was to establish the effect that pre-cooling the skin without a concomitant reduction in core temperature has on subsequent self-paced cycling performance under warm humid (31 degrees C and 60% relative humidity) conditions. Seven moderately trained males performed a 30 min self-paced cycling trial on two separate occasions. The conditions were counterbalanced as control or whole-body pre-cooling by water immersion so that resting skin temperature was reduced by approximate to 5-6 degrees C. After pre-cooling, mean skin temperature was lower throughout exercise and rectal temperature was lower (P < 0.05) between 15 and 25 min of exercise. Consequently, heat storage increased (P < 0.003) from 84.0 +/- 8.8 W . m(-2) to 153 +/- 13.1 W . m(-2) (mean +/- s((x) over bar)) after pre-cooling, while total body sweat fell from 1.7 +/- 0.1 1 . h(-1) to 1.2 +/- 0.1 1 . h(-1) (P < 0.05). The distance cycled increased from 14.9 +/- 0.8 to 15.8 +/- 0.7 km (P < 0.05) after pre-cooling. The results indicate that skin pre-cooling in the absence of a reduced rectal temperature is effective in reducing thermal strain and increasing the distance cycled in 30 min under warm humid conditions.