对于在高温环境下工作的澳大利亚消防员来说，重复的工作轮次会增加热应激。
Repeat work bouts increase thermal strain for Australian firefighters working in the heat.
作者信息
Walker Anthony, Argus Christos, Driller Matthew, Rattray Ben
机构信息
Discipline of Sport and Exercise Science, UC Research Institute for Sport and Exercise, University of Canberra, ACT , Australia.
出版信息
Int J Occup Environ Health. 2015;21(4):285-93. doi: 10.1179/2049396715Y.0000000006. Epub 2015 Apr 7.
BACKGROUND
Firefighters regularly re-enter fire scenes during long duration emergency events with limited rest between work bouts. It is unclear whether this practice is impacting on the safety of firefighters.
OBJECTIVES
To evaluate the effects of multiple work bouts on firefighter physiology, strength, and cognitive performance when working in the heat.
METHODS
Seventy-seven urban firefighters completed two 20-minute simulated search and rescue tasks in a heat chamber (105 ± 5°C), separated by a 10-minute passive recovery. Core and skin temperature, rate of perceived exertion (RPE), thermal sensation (TS), grip strength, and cognitive changes between simulations were evaluated.
RESULTS
Significant increases in core temperature and perceptual responses along with declines in strength were observed following the second simulation. No differences for other measures were observed.
CONCLUSIONS
A significant increase in thermal strain was observed when firefighters re-entered a hot working environment. We recommend that longer recovery periods or active cooling methods be employed prior to re-entry.
背景
在长时间的紧急事件中，消防员会定期重新进入火灾现场，且工作轮次之间的休息时间有限。目前尚不清楚这种做法是否会影响消防员的安全。
目的
评估多次工作轮次对高温环境下消防员生理、力量和认知表现的影响。
方法
77名城市消防员在热室（105±5°C）中完成了两项20分钟的模拟搜索和救援任务，中间间隔10分钟的被动恢复时间。评估了模拟之间的核心体温、皮肤温度、自觉用力程度（RPE）、热感觉（TS）、握力和认知变化。
结果
第二次模拟后，观察到核心体温和感知反应显著增加，同时力量下降。其他指标未观察到差异。
结论
当消防员重新进入高温工作环境时，观察到热应激显著增加。我们建议在重新进入之前采用更长的恢复期或主动冷却方法。
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