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Impact of ambient temperature on energy cost and economical speed during level walking in healthy young males

机译:健康年轻男性水平行走过程中环境温度对能量成本和经济速度的影响

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We measured oxygen consumption and carbon dioxide output during walking [per unit distance (Cw) values] for 14 healthy young human males at seven speeds from 0.67 to 1.67?m?s?1(4?min per stage) in thermoneutral (23°C), cool (13°C), and hot (33°C) environments. TheCwat faster gait speeds in the 33°C trial was slightly higher compared to those in the 23°C and 13°C trials. We found the speed at which the young males walked had a significant effect on theCwvalues (P0.05), but the different environmental temperatures showed no significant effect (P0.05). Economical speed (ES) which can minimize theCwin each individual was calculated from a U-shaped relationship. We found a significantly slower ES at 33°C [1.265 (0.060)?m?s?1mean (s.d.)] compared to 23°C [1.349 (0.077)?m?s?1] and 13°C [1.356 (0.078)?m?s?1,P0.05, respectively] with no differences between 23°C and 13°C (P0.05). Heart rate and mean skin temperature responses in the 33°C condition increased throughout the walking trial compared to 23°C and 13°C (allP0.05). These results suggest that an acutely hot environment slowed the ES by ~7%, but an acutely cool environment did not affect theCwand ES.
机译:我们在热中性(23°)下以0.67至1.67?m?s?1(每级4?min)的七个速度测量了14位健康的青年男性在步行过程中的耗氧量和二氧化碳排放量(每单位距离(Cw)值)。 C),凉爽(13°C)和高温(33°C)的环境。与在23°C和13°C试验中相比,在33°C试验中Cwat步态速度更快。我们发现年轻男性的行走速度对Cw值有显着影响(P <0.05),但是不同的环境温度却没有显着影响(P> 0.05)。从U型关系计算出可以使每个人的Cwin最小的经济速度(ES)。我们发现,与23°C [1.349(0.077)?m?s?1]和13°C [1.356(0.078)(1.365(0.078)?m?s?1平均(sd)]相比,ES在33°C [1.265(0.060)?m?s?1平均(sd)]下的速度要慢得多)?m?s?1,P <0.05,分别在23°C和13°C之间无差异(P> 0.05)。与23°C和13°C相比,在整个步行试验中,33°C条件下的心率和平均皮肤温度响应均增加(allP <0.05)。这些结果表明,在炎热的环境中,ES减慢了约7%,但是在凉爽的环境中,Cwand ES并未受到影响。

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