Brajkovic D, Ducharme M B, Frim J
Human Protection and Performance, Defence and Civil Institute of Environmental Medicine, Toronto, Ontario, Canada M3M 3B9.
J Appl Physiol (1985). 1998 Dec;85(6):2054-65. doi: 10.1152/jappl.1998.85.6.2054.
There is a need for a hand-heating system that will keep the hands warm during cold exposure without hampering finger dexterity. The purpose of this study was to examine the effects of torso heating on the vasodilative responses and comfort levels of cooled extremities during a 3-h exposure to -15 degreesC air. Subjects were insulated, but their upper extremities were left exposed to the cold ambient air. The effect of heating the torso [torso-heating test (THT)] on hand comfort was compared with a control condition in which no torso heating was applied, but Arctic mitts were worn [control test (CT)]. The results indicate that mean finger temperature, mean finger blood flow, mean toe temperature, mean body skin temperature, body thermal comfort, mean finger thermal comfort, and rate of body heat storage were all significantly (P < 0.05) higher on average (n = 6) during THT. Mean body heat flow was significantly (P < 0.05) lower during THT. There were no significant differences (P >/= 0.05) in rectal temperature between CT and THT. Mean unheated body skin temperature and mean unheated body heat flow (both of which did not include the torso area in the calculation of mean body skin temperature and mean body heat flow) were also calculated. There were no significant differences (P >/= 0.05) in mean unheated body skin temperature and mean unheated body heat flow between CT and THT. It is concluded that the application of heat to the torso can maintain finger and toe comfort for an extended period of time during cold exposure.
需要一种手部加热系统，该系统能在寒冷环境中保持手部温暖，同时不妨碍手指的灵活性。本研究的目的是检验在暴露于-15摄氏度空气中3小时期间，躯干加热对冷却肢体的血管舒张反应和舒适度的影响。受试者身体进行了隔热处理，但上肢暴露在寒冷的环境空气中。将躯干加热[躯干加热试验（THT）]对手部舒适度的影响与未进行躯干加热但佩戴北极手套的对照条件[对照试验（CT）]进行了比较。结果表明，在THT期间，平均手指温度、平均手指血流量、平均脚趾温度、平均身体皮肤温度、身体热舒适度、平均手指热舒适度和身体蓄热率平均（n = 6）均显著更高（P < 0.05）。THT期间平均身体热流显著更低（P < 0.05）。CT和THT之间直肠温度无显著差异（P≥0.05）。还计算了平均未加热身体皮肤温度和平均未加热身体热流（在计算平均身体皮肤温度和平均身体热流时，两者均不包括躯干区域）。CT和THT之间平均未加热身体皮肤温度和平均未加热身体热流无显著差异（P≥0.05）。结论是，在寒冷暴露期间，对躯干加热可长时间维持手指和脚趾的舒适度。
