Response patterns of hand skin temperature and psychological parameters in a cold environment
In order to minimize the risk of hand frostbite and improve work efficiency in cold environ-ments,a hand cold stress experiment was conducted to reveal the response patterns of hand skin tem-perature and psychological parameters in response to localized cold exposure.Firstly,twelve male sub-jects were recruited to participate.Then,the cold environment was simulated in an artificial climate chambers.The subjects were exposed to 16℃in protective clothing,and their hands were exposed to two working conditions:16℃(control group)and-10℃(experimental group).Finally,during the experiment,the skin temperatures in such seven points as palm,dorsum of hand,thumb,index finger,middle finger,ring finger,and little finger and the psychological parameters including thermal sensation vote of the hand(TSV)and pain sensation vote of the hand(PSV)were continuously measured.The re-sults indicate that with the increase of the local cold exposure time,the hand skin temperature will show a trend of change that first decreases sharply and then tends to stabilize.The hand can be divided into three blocks:first,dorsum of hand and palm,followed by the index,middle and ring fingers,and finally thumb and little finger.The temperature difference between the thumb and the back was greatest in the test group.Hand skin temperature shows a linear relationship with hand thermal sensation(R2=0.86)and a nonlinear relationship with hand pain sensation(R2=0.98).Compared to TSV hysteresis,pain occurs when the hand skin temperature is between 15 and 20℃.Afterwards,the hand skin temperature drops exponentially.When the hand skin temperature is around 12℃,the pain is unbearable.Attention should be paid to hand protection in cold environments,and the maximum cold exposure time of bare hands should not exceed 10 minutes when the ambient temperature is-10℃to ensure both hand com-fort and dexterity during operation.The results of this research can provide technical support for reducing the risk of frostbite in low-temperature environments,as well as for the design of warm clothing in cold regions and the research and development of individual protective equipment for special rescue groups.
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