持续的认知负载对手指循环和热感知反应对局部降温的影响
Maaike I Moes1,2, Antonis Elia1,2, Ola Eiken3
1Division of Environmental Physiology, Department of Physiology and Pharmacology, Karolinska Institute, Stockholm, Sweden.
Journal of neurophysiology
|July 7, 2025
概括
认知负载可以改变冷冷的反应. 精神疲劳暂时减少了手指血管收缩和热不适,同时认知和寒冷压力有助于冷却后的再流.
科学领域:
- 人体生理学 人体生理学
- 环境应激反应环境应激反应
- 认知神经科学 认知神经科学
背景情况:
- 局部冷却会触发包括血管收缩和变化的热感应在内的生理反应.
- 认知负荷可以影响自主和血管功能.
- 认知应变和对寒冷的外周血管反应之间的相互作用尚未完全理解.
研究的目的:
- 研究持续的认知负载如何调节手指血管运动和热感知反应对局部冷却的反应.
- 为了比较两个认知负载范式下的反应:冷暴露之前的认知负载与同时的认知和冷暴露.
主要方法:
- 12名健康的男性在8°C的水中浸泡了30分钟的手.
- 实验条件包括:认知负载随后冷 (认知→冷),同时认知负载和冷 (认知+冷),以及对照试验 (被动冷却).
- 监测指的温度,皮肤血管导电率 (CVC),平均动脉压和感知反应.
主要成果:
- 在cognitive→cold试验中,冷却期间的手指CVC得到了增强,平均动脉压的寒冷诱导增加得到了减弱,与对照组相比,热不适减少了.
- 在认知+冷试验中,冷却过程中没有观察到手指CVC的差异,但在重新加热过程中增加了CVC.
- 在干预试验中,认知任务增加了感知到的精神努力和疲劳.
结论:
- 精神疲劳可以暂时减轻由寒冷引起的手指血管收缩,并减轻热不适.
- 同时的认知负载和寒冷暴露不会改变冷却期间的手指血管活性,但会增强冷却后的反.
- 这些发现突出了在热应激期间认知状态和外周血管调节之间的复杂相互作用.
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