INTERACTIONS OF PHYSICAL TRAINING AND HEAT ACCLIMATION: THE THERMOPHYSIOLOGY OF EXERCISING IN A HOT CLIMATE

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Authors
  1. Aoyagi, Y.
  2. McLellan, T.M.
  3. Shephard, R.J.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
Abstract
Physical training and heat acclimation are both commonly adopted tactics to improve performance and/or tolerance times when military personnel must work in the heat. Potential benefits include: 1) improved aerobic fitness (probably seen mainly after training), 2) a lower resting body temperature that allows greater heat storage (probably seen mainly after acclimation), 3) a decreased energy cost of a given intensity of exercise (seen after acclimation and also as the learning component of training), 4) an enhanced sweating response (probably developed by both treatments), 5) a slower increase in body temperature due to 3) and/or 4) (seen after both treatments), 6) a lower heart rate (seen after both treatments), and 7) improved subjective tolerance (found after both treatments). Factors affecting improvements in physiological and psychological responses to a given set of conditions include: 1) the soldier's initial fitness and acclimatization to heat, 2) age, gender, hydration, sleep deprivation, circadian rhythms and in women the menstrual cycle, 3) use of ergogenic aids such as fluid ingestion, carbohydrate and/or electrolyte replacement and blood doping, 4) the mode of exercise, the severity of environmental heat stress and the type of clothing worn, and 5) the intensity, duration and frequency of physical training and/or heat acclimation, the length of any rest intervals and cumulative depletion of body water and minerals.
Keywords
Acclimatisation;Adaption (physiology);Work tolerance time;Endurance training
Report Number
DCIEM-96-P-14 — Research Paper
Date of publication
31 Jan 1996
Number of Pages
39
DSTKIM No
99-00091
CANDIS No
510013
Format(s):
Hardcopy;Document Image stored on Optical Disk

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