HEAT STRAIN WITH COMBAT CLOTHING WORN OVER A CHEMICAL DEFENSE (CD) VAPOR PROTECTIVE LAYER

Authors
  1. McLellan, T.M.
  2. Bell, D.G.
  3. Dix, J.K.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
The purpose of the present study was to quantify and compare the heat strain when a new chemical defense (CD) vapor protective layer was worn under combat clothing. There were 23 unacclimatized males (27.1 plus or minus 5.6 y, 80.9 plus or minus 9.3 kg, 1.78 plus or minus 0.05 m) assigned to a light intermittent (L, n = 7), moderate continuous (M, n = 8) or heavy continuous (H, n = 8) exercise group. All subjects performed three trials at 40C and 30% relative humidity wearing the current CD protective clothing over combat clothing (CD-current), the CD vapor protective layer alone (CD-vapor) or under combat clothing (CD-vapor/combats). Tolerance times were significantly different among the three clothing trials for each exercise group. For group L, tolerance time increased from 116 min for CD-Current to 208 min for CD-vapor/combats and to 289 min for CD-vapor. For group M. tolerance time increased from 67 to 87 and to 133 min for CD-current, CD-vapor/combats and CD-vapor, respectively, Finally for group H, respective times for CD-current, CD-vapor/combats and CD-vapor were 50 min, 59 min and 80 min. Significant differences among the clothing configurations were found also for the evaporative efficiency of sweat from the clothing, heart rates, rectal and skin temperatures. TRUNCATED
Report Number
DCIEM-93-34 — Reprint
Date of publication
01 Oct 1993
Number of Pages
7
Reprinted from
Aviation, Space, and Environmental Medicine, August 1994, p 757-763
DSTKIM No
94-04933
CANDIS No
145033
Format(s):
Hardcopy;Originator's fiche received by DSIS

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