The effects of physical training on thermoregulatory responses from the viewpoint of skin sympathetic nerve activity

从皮肤交感神经活动角度观察体能训练对体温调节反应的影响

• 批准号: 13680026
• 负责人: KONDO Narihiko
• 金额: $ 2.37万
• 依托单位: Kobe University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13680026/
• 关键词: physical training; Thermoregulatory response; sweating response; skin blood flow response; skin sympathetic nerve activity; 発汗量; 皮膚血流量; 体温調節

To investigate the effect of physical training on thermoregulatory responses from the viewpoint of skin sympathetic nerve activity (SSNA), we have set two purposes in this study. 1) How is skin sympathetic nerve activity related to heat loss responses to a marked rise in internal temperature? 2) How is the relation between skin sympathetic nerve activity and heat loss responses influenced by physical training in humans? Each subject performed 10 consecutive days of exercise training in a temperature condition. This training consisted of cycle exercise of 90 min per day at 60% maximal oxygen uptake. Whole body heating by a water perfused-suit was performed until esophageal temperature (Tes) increased by about 1℃ before and after the training. The main results were obtained as follows:1) There was good positive relation between Tes and SSNA as well as Tes-sweating rate (SR) and Tes-cutaneous vascular conductance (CVC) relationships.2) There was good correlation between SSNA and heat losses. Moreover, the correlation coefficient was significantly higher in SR response than that in CVC response.3) The training induced to increase maximal oxygen uptake of 5% and decrease resting HR and Tes.4) The regression lines of Tes-SR, Tes-CVC and Tes-SSNA tended to be shifted to left by the training.5) The regression lines of SSNA-SR and SSNA-CVC tended to be also shifted to left by the training.These results suggest that the physical training in temperature condition may reduce a threshold for onset of activities of sweating, cutaneous vasodilation and skin sympathetic nerve. In addition, sweating and cutaneous vasodilation responses at a given skin sympathetic nerve activity may be enhanced by the training.

为了从皮肤交感神经活动(SSNA)的角度研究运动对体温调节反应的影响，本研究设定了两个目的。1)皮肤交感神经活动与体温显著升高时的散热反应有何关系？2)人体体能训练对皮肤交感神经活动与散热反应之间的关系有何影响？每个受试者在温度条件下进行连续10天的运动训练。这项训练包括每天90min的最大摄氧量为60%的循环运动。在训练前后，用水浸泡服进行全身加热，直到食道温度(TES)增加约1℃。主要研究结果如下：1)TES与SSNA、TES出汗率(SR)、TES-皮肤血管电导(CVC)呈良好的正相关。3)训练导致最大摄氧量增加5%，静息HR和TES减少。4)训练使TES-SR、TES-CVC和TES-SSNA的回归线左移。5)训练使SSNA-SR和SSNA-CVC的回归线也左移。此外，训练可以增强特定皮肤交感神经活动时的出汗和皮肤血管扩张反应。