EFFICACY OF LIQUID, AIR, AND PHASE CHANGE MATERIAL TORSO COOLING DURING LIGHT EXERCISE WHILE WEARING NBC CLOTHING

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Authors
  1. McLellan, T.M.
  2. Frim, J.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
This study compared the thermoregulatory responses with liquid, air and phase change material (PCM) torso cooling during light exercise at 40C while wearing NBC protective clothing. The liquid- (LC) and air-cooling (AC) systems were powered from external portable chiller units. The PCM cooling vests, which were supplied by MicroClimate Systems Incorporated, were worn under the nuclear, biological and chemical (NBC) overgarment and were tested with a vertical (CVV) and horizontal (CVH) design. Seven males (29 yrs, 75.6 kg, 1.78 m) performed a no cooling (NC) and 4 cooling trials while walking at 3.5 km.h 1(-) on a treadmill in the environmental chamber. During the NC condition, tolerance times were 100 min and final core temperature was 39.1C. For the PCM trials (CVV and CVH), tolerance times were extended by 30 min but core temperature still rose to reach values close to 39.0C indicating that the cooling vests could only delay the exhaustion from the heat exposure. However, with both the LC and AC trials, all subjects completed 180 min of exercise and they could have continued longer given that their core temperatures were still below 38.0 C. The results have shown that the PCM cooling vests are of benefit for work tasks that continue between 1 to 2 hours but these vests are not as effective in reducing the heat strain of wearing NBC protective clothing in hot environments as liquid- or air-cooling systems.
Keywords
Temperature regulation;Heat flows;Skin vapour pressure;PCM (Phase Change Material)
Report Number
DCIEM-98-R-36 — Technical Report
Date of publication
01 Mar 1998
Number of Pages
35
DSTKIM No
98-01429
CANDIS No
508212
Format(s):
Hardcopy;Document Image stored on Optical Disk

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