Department of Health Research, SINTEF, NO-7465, Trondheim, Norway; Department of Biology, Norwegian University of Science and Technology (NTNU), NO-7491, Trondheim, Norway.
Department of Health Research, SINTEF, NO-7465, Trondheim, Norway.
J Therm Biol. 2020 Apr;89:102537. doi: 10.1016/j.jtherbio.2020.102537. Epub 2020 Feb 15.
Prolonged exposure to cold can impair manual performance, which in turn can affect work task performance. We investigated whether mild whole-body cold stress would affect isometric force control during submaximal hand grip and key pinch tasks. Twelve male participants performed isometric hand grip and key pinch tasks at 10% and 30% of maximal voluntary contraction (MVC) for 30 and 10 s respectively, in cold (8 °C) and control (25 °C) conditions. Finger temperature decreased significantly by 18.7 ± 2.1 °C and continuous low-intensity shivering in the upper trunk increased significantly in intensity and duration during cold exposure. Rectal temperature decreased similarly for the 8 °C and 25 °C exposures. Force variability (FCv) was <2% for the hand grip tasks, and <3% for the key pinch tasks. No significant changes in FCv or force accuracy were found between the ambient temperatures. In conclusion, isometric force control during hand grip and key pinch tasks was maintained when participants experienced mild whole-body cold stress compared with when they were thermally comfortable.
长时间暴露在寒冷环境中会降低手的操作能力，从而影响工作任务的执行。本研究旨在探讨轻度全身冷应激是否会影响最大自主收缩（MVC）10%和 30%时的手握和指捏等长力量控制。12 名男性参与者在冷（8°C）和对照（25°C）条件下，分别进行 30s 和 10s 的手握和指捏等长力量任务，手指温度分别显著降低 18.7°C±2.1°C，上半身持续低强度颤抖的强度和持续时间也显著增加。直肠温度在 8°C 和 25°C 暴露时相似下降。手握任务的力量变异性（FCv）<2%，指捏任务的 FCv<3%。在不同环境温度下，FCv 和力量准确性均无显著变化。综上，与热舒适状态相比，参与者在轻度全身冷应激下进行手握和指捏等长力量任务时，力量控制保持不变。
