短期重复暴露于冷空气不会影响健康人群的冷热调节反应或手动表现
Billie K Alba1, Andrew M Greenfield1, Phillip O Bodurtha1,2
1Thermal and Mountain Medicine Division, US Army Research Institute of Environmental Medicine, Natick, Massachusetts, United States.
概括
八天暴露在冷空气中并没有改善皮肤温度,热舒适度或手的灵敏度. 这项研究表明,短期的寒冷适应并不能增强四肢功能或 perfusion.
科学领域:
- 生理学 生理学 生理学
- 环境医学 环境医学
- 人类的适应能力
背景情况:
- 习惯,一种寒冷适应的形式,涉及降低外周血管收缩和增加皮肤温度 (Tsk) 经过反复暴露在寒冷.
- 虽然习惯性与减弱的交感激活有关,但其在减轻寒冷对外围温度,舒适度和手部功能的负面影响方面的有效性尚不清楚.
- 习惯可能增强四肢对寒冷的反应的确切机制尚未完全理解.
研究的目的:
- 通过反复暴露在冷空气中来研究习惯的有效性对生理和功能反应.
- 为了确定8天暴露在冷空气中是否会改变皮肤温度 (Tsk),皮肤血流 (SkBF),热舒适度或手工敏捷度.
- 评估重复暴露于寒冷对反射皮肤血管收缩的影响.
主要方法:
- 十名健康的参与者接受了8天的每日冷空气暴露 (8°C2小时).
- 皮肤温度 (Tsk) 和皮肤血流 (SkBF) 在基线,第1天和第8天被测量.
- 评估了热舒适度和手动灵敏度,并使用透水的西装测量了反射血管收缩.
主要成果:
- 在寒冷的空气中,Tsk和SkBF每天下降,但在8天内没有显著变化.
- 热舒适度和手动灵敏度在寒冷中下降,但在暴露期间没有显著改变.
- 反射皮肤血管收缩反应不受重复冷空气暴露的影响.
结论:
- 连续八天暴露在冷空气中并没有导致Tsk,SkBF或反射血管收缩的显著生理适应.
- 经过测试的习惯化方案并没有改善寒冷中的热舒适度或手工敏捷性.
- 短期的重复冷空气暴露似乎不足以诱导肢体 perfusion,温度或功能的有益适应.
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