Inside the 'Hurt Locker': The Combined Effects of Explosive Ordnance Disposal and Chemical Protective Clothing on Physiological Tolerance Time in Extreme Environments.

Annals of Occupational Hygiene Pub Date : 2015-08-01 Epub Date: 2015-04-15 DOI:10.1093/annhyg/mev029
Joseph T Costello, Kelly L Stewart, Ian B Stewart
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引用次数: 5

Abstract

Background: Explosive ordnance disposal (EOD) technicians are often required to wear specialized clothing combinations that not only protect against the risk of explosion but also potential chemical contamination. This heavy (>35kg) and encapsulating ensemble is likely to increase physiological strain by increasing metabolic heat production and impairing heat dissipation. This study investigated the physiological tolerance times of two different chemical protective undergarments, commonly worn with EOD personal protective clothing, in a range of simulated environmental extremes and work intensities

Methods: Seven males performed 18 trials wearing 2 ensembles. The trials involved walking on a treadmill at 2.5, 4, and 5.5 km h(-1) at each of the following environmental conditions, 21, 30, and 37°C wet bulb globe temperature. The trials were ceased if the participants' core temperature reached 39°C, if heart rate exceeded 90% of maximum, if walking time reached 60min or due to volitional fatigue.

Results: Physiological tolerance times ranged from 8 to 60min and the duration (mean difference: 2.78min, P > 0.05) were similar in both ensembles. A significant effect for environment (21 > 30 > 37°C wet bulb globe temperature, P < 0.05) and work intensity (2.5 > 4 > 5.5 km h(-1), P < 0.05) was observed in tolerance time. The majority of trials across both ensembles (101/126; 80.1%) were terminated due to participants achieving a heart rate equivalent to greater than 90% of their maximum.

Conclusions: Physiological tolerance times wearing these two chemical protective undergarments, worn underneath EOD personal protective clothing, were similar and predominantly limited by cardiovascular strain.

在“拆弹部队”内部:爆炸军械处理和化学防护服对极端环境下生理耐受时间的综合影响。
背景:爆炸物处理(EOD)技术人员经常被要求穿着专门的服装组合,不仅可以防止爆炸的危险,还可以防止潜在的化学污染。这种沉重(>35kg)的包裹体可能通过增加代谢产热和损害散热来增加生理应变。本研究研究了两种不同的化学防护内衣(通常与排爆个人防护服一起穿着)在一系列模拟极端环境和工作强度下的生理耐受时间。方法:7名男性穿着2套套装进行了18次试验。试验包括在跑步机上以2.5、4和5.5公里每小时(-1)的速度在以下环境条件下行走:21、30和37°C湿球温度。如果参与者的核心温度达到39°C,如果心率超过最大心率的90%,如果步行时间达到60分钟或由于意志疲劳,则停止试验。结果:两组生理耐受时间为8 ~ 60min,持续时间平均差异为2.78min, P > 0.05。环境(21 > 30 > 37°C湿球温度,P < 0.05)和工作强度(2.5 > 4 > 5.5 km h(-1), P < 0.05)对耐受时间有显著影响。两组的大多数试验(101/126;80.1%)由于参与者达到相当于其最大心率的90%以上而终止。结论:穿着这两种化学防护服的生理耐受次数相似,且主要受心血管应变的限制。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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