Comparison of Short-Term Aerobic Training and High Aerobic Power on Tolerance to Uncompensable Heat Stress


  1. Cheung, S.S.
  2. McLellan, T.M.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
This study investigated whether, in subjects of moderate aerobic fitness, short-term aerobic training could replicate the improved physioligical responses to exercise-heat stress observed in individuals with a high level of aerobic fitness. Males of moderate (MF; <50 ml - kg 1(-) min 1(-) VO2peak, n = 8) and high (HF; >55 ml - kg 1(-) min 1(-) VO2peak, n =8) aerobic fitness walked at 3.5 km - h 1(-) in the heat (40C, 30% relative humidity) wearing nuclear, biological, and chemical protective clothing. Tests were conducted once on HF subjects and on MF subjects before (MF-Pre) and after (MF-Post) a 2-week program 6 d - week 1(-) of daily aerobic training (1 h treadmill exercise at 65% VO2peak for 12 d, 22C, 40% relative humidity). The training significantly increased VO2peak by 6.5%, while heart rate (tc) and rectal tempertaure (Tre) rise decreased during exercise in a thermoneutral environment. HF had lower body mass and body fat content than MF, and VO2peak remained lower in MF pre-or post-training. In the heat, MF-Post had a decreased skin temperature (Tsk) and an increased sweat rate compared with MF-Pre, but no changes were observed in tc, Tre, or tolerance time (TT). TRUNCATED
Aerobic fitness;Endurance (physiology);Body fatness
Report Number
DCIEM-97-P-62 — Reprint
Date of publication
01 Jul 1999
Number of Pages
Reprinted from
Aviation, Space and Environmental Medicine, vol 70, no 7, 1999, p 637-643
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