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实验选用8名男青年作为受试者,年龄20.1±2.0岁。在热暴露前,用直接法测定每个人的o_2max(47.8±2.6ml/kg/min)。然后在高温室内的水平跑步机上负重行走3h,室内干球温度35℃,湿球温度29℃。各个负重行走组的劳动强度为29～52％o_2max。结果表明,生理参数与％o_2max之间呈非线性相关,非线性相关的“转折点”分别为36％和38％o_2max,而且“转折点”前后两条回归线的斜率差别非常显著(P<0.001)。这些变化说明,当劳动强度超过36～38％o_2max时,人体的生理反应急剧增加。因此,我们认为可以把36～38％o_2max作为人在高温环境从事体力劳动的容许上限。
Eight young men were selected as subjects, aged 20.1 ± 2.0 years. Before heat exposure, the o_2max for each individual was determined by direct method (47.8 ± 2.6 ml / kg / min). Then in the high-temperature indoor treadmill treadmill walking load 3h, indoor dry-bulb temperature of 35 ℃, wet-bulb temperature of 29 ℃. The labor intensity of each load walking group is 29 ~ 52% o_2max. The results showed that there was a nonlinear correlation between physiological parameters and% o_2max. The “turning points” related to the nonlinearity were 36% and 38% o_2max, respectively, and the slopes of the two regression lines before and after the “turning point” were significantly different (P <0.001 ). These changes indicate that when the labor intensity exceeds 36 ~ 38% o_2max, the body’s physiological response dramatically increases. Therefore, we think that 36 ~ 38% o_2max can be regarded as the upper limit of man’s manual labor in high temperature environment.