Optimizing the Use of Phase Change Material Vests Worn During Explosives Ordnance Disposal Operations in Hot Conditions

Frontiers in Physiology
Sarah Lee DaveyCharles Doug Thake

Abstract

Phase change material (PCM) cooling garments' efficacy is limited by the duration of cooling provided. The purpose of this study was to evaluate the effect of replacing a PCM vest during a rest period on physiological and perceptual responses during explosive ordnance disposal (EOD) related activity. Six non-heat acclimated males undertook three trials (consisting of 2 × 3 × 16.5 min activity cycles interspersed with one 10 min rest period) in 40°C, 12% relative humidity whilst wearing a ≈38 kg EOD suit. Participants did not wear a PCM cooling vest (NoPCM); wore one PCM vest throughout (PCM1) or changed the PCM vest in the 10 min rest period (PCM2). Rectal temperature (T re ), mean skin temperature (T skin ), heart rate (HR), Physiological Strain Index (PSI), ratings of perceived exertion, temperature sensation and thermal comfort were compared at the end of each activity cycle and at the end of the trial. Data displayed as mean [95% CI]. After the rest period, a rise in T re was attenuated in PCM2 compared to NoPCM and PCM1 (-0.57 [-0.95, -0.20]°C and -0.46 [-0.81, -0.11]°C, respectively). A rise in HR and T skin was also attenuated in PCM2 compared to NoPCM and PCM1 (-23 [-29, -16] beats⋅min-1 and -17 [-28, -6.0] beat...Continue Reading

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Software Mentioned

NoPCM
Statistical Package for the Social Sciences
PCM1

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