EFFECTS OF ENDURANCE TRAINING ON HEAT-EXERCISE TOLERANCE IN MEN WEARING NBC PROTECTIVE CLOTHING

Authors
  1. Aoyagi Y.
  2. McLellan, T.M.
  3. Shepard, R.J.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Sixteen unacclimatized males were assigned to either an 8-week treatment of endurance training (n = 7) or control (n = 9). The training program consisted of four 45-min running sessions per week at 80% of maximal aerobic power (VO2 sub max), performed at < 25C. Subjects were tested before and after treatment wearing either standard combat clothing or NBC protective clothing. Test sessions involved treadmill walking at 4.8 km.1(-) and 2% grade in a climatic chamber maintained at 40C and 30% rh. The heat-exercise tolerance time (HETT) was defined as the time to the first of: (1) a rectal temperature (T sub re) of 39.3C, (2) a heart rate (HR) + or - 95% of the subject's observed maximum for 3 min, (3) unwillingness of the subject to continue, or (4) elapse of 2 h. Endurance training increased VO2 sub max (+16%) and plasma volume (+8%), but HETT was unchanged in either clothing ensemble. When wearing standard combat clothing, training slowed the rate of increase in HR and T sub re and decreased men subjective rating of perceived exertion, with a trend to decreased mean skin temperature (T sub k). When wearing NBC protective clothing, in contrast, the only significant change was a higher post-training T sub k. TRUNCATED.
Report Number
DCIEM-93-46 —
Date of publication
01 Aug 1993
Number of Pages
38
DSTKIM No
94-00709
CANDIS No
137640
Format(s):
Hardcopy;Originator's fiche received by DSIS

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