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Physiological responses and thermal sensation in the recovery period after extremely cold exposure

机译：极冷暴露后恢复期间的生理反应和热敏

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摘要

Climate extremes have become more frequent in recent years. Recovery to thermal neutral states is important for people who have to be exposed to cold outdoor built environment. This study aims to investigate physiological responses and thermal sensation during the recovery period after exposure to different degrees of cold environment. Twelve healthy males wearing uniform clothing were seated in a 24 degrees C room for 30 min before transferring to a cold climatic chamber for 30 min, after which they began recovery in a 24 degrees C room for 40 min. The temperature of the cold climatic chamber was set to -5 degrees C, -10 degrees C, and -15 degrees C, respectively. Most physiological parameters, including core temperature, local skin temperature, heart rate, blood pressure, respiratory rate, and overall thermal sensation, were recorded. After extremely cold exposure, heart rate decreased rapidly in the first 5 min of the recovery period, by as much as 14.69 bpm, and subsequently reached a steady state, which was significantly lower than the baseline value. Low temperature proved to be the main cause of the rapid drop in heart rate. Even though the duration of the recovery was longer than that of the exposure period, under the -10 degrees C and -15 degrees C conditions, blood pressure, heart rate and local skin temperature still could not return to baseline levels. Thermal sensation also showed an asymmetric phenomenon, similar to the thermal neutral environment. The results of this experiment can be used to provide recommendations for people with extremely cold exposure.
机译：近年来，气候极端变得更加频繁。热中性国家的恢复对于必须暴露在冷户外建筑环境的人来说是重要的。本研究旨在在暴露于不同程度的冷环境后恢复期间调查生理反应和热敏。穿着均匀衣物的十二名健康的男性在24℃的房间里坐下30分钟，然后将冷气室转移到30分钟，然后在24℃的房间中开始回收40分钟。冷气室的温度分别设定为-5℃，-10℃和-15摄氏度。记录了大多数生理参数，包括核心温度，局部皮肤温度，心率，血压，呼吸速率和总热敏。在极冷暴露后，恢复期的前5分钟内的心率迅速下降，至多至14.69bpm，随后达到稳定状态，显着低于基线值。低温证明是心率快速下降的主要原因。尽管回收的持续时间长于暴露时期，但在-10℃和-15摄氏度下，血压，心率和局部皮肤温度仍然无法返回基线水平。热敏感觉还显示出不对称现象，类似于热中性环境。该实验的结果可用于为具有极冷暴露的人提供建议。

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