高温环境不同湿度条件下急性运动对人体血清催乳素、生长激素和皮质醇的影响

Impact of Acute Exercise in Different Relative Humidity Hot Environment on the Human Serum PRL,GH and Cortisol

目的:探讨高温环境不同湿度条件下一次急性大强度运动对机体应激程度的影响;方法:20名来自不同专项的(平均年龄21.7±1.13岁,平均训练年限3.9±0.87年)男性受试者随机分为暴露组和运动组,分别在33℃,相对湿度20%、40%、60%、80%环境下进行高温暴露和进行急性大强度力竭性运动。用ELISA法测定运动前、后血清催乳素(PRL)、生长激素(GH)、皮质醇(cortisol)的浓度;结果:运动后血清PRL相对湿度60%组明显高于相对湿度20%组(P<0.01),运动后血清cortisol相对湿度80%组明显高于相对湿度20%组(P<0.01),运动后血清PRL、GH和cortisol均显著性升高。暴露组除相对湿度80%组暴露后血清cortisol明显低于暴露前,其他各组均无显著性差异;结论:血清PRL是高温环境下运动对机体刺激较为敏感的一个指标,它可以反映机体热应激程度的大小,血清PRL与体温呈非常显著性相关。在高温环境下随着相对湿度的增加,运动引起的神经内分泌变化呈增加趋势,相对高温环境下,不同湿度条件运动对机体的应激程度不同。

The purpose of this study was to discuss the impact of acute exercise in different relative humidity and hot environment on the degree of stress of human.Twenty male subjects were randomly divided into exposure group and exercise group.The exercise group conducted hard intensity treadmill exercise in the temperature of 33℃ and the relative humidity of 20%,40%,60%,80% separately,while the exposure group stand only.Before and after the exercise,the serum PRL、GH and cortisol concentration were determined by ELISA.After exercise,the serum PRL concentration the RH 60% group was higher than RH 20% group the serum cortisol RH 80% group was higher than RH 20% group.After exercise,the serum GH,PRL,cortisol all increased while the exposure group had no significantly change but for the RH 80% group after exposure was lower than before exposure.The serum PRL is a good index of body temperature,between the serum PRL and oral temperature have positive correlation,and it can reflect the degree of heat stress.Exercise in the hot environment,the changes of the neuroendocrine had an increased trend as the relative humidity increasing.Although exercise in the same temperature,the stress is different when the relative humidity is different.