Influence of aerobic fitness and body fatness on tolerance to uncompensable heat stress


  1. Selkirk, G.A.
  2. McLellan, T.M.
Corporate Authors
Defence and Civil Inst of Environmental Medicine, Downsview ONT (CAN)
This study examined the independent and combined importance of aerobic fitness and body fatness on physiological tolerance and exercise time during weight-bearing exercise while wearing a semipermeable protective ensemble. Twenty-four men and women were matched for aerobic fitness and body fatness in one of four groups (4 men and 2 women in each group). Aerobic fitness was expressed per kilogram of lean body mass (LBM) to eliminate the influence of body fatness on the expression of fitness. Subjects were defined as trained (T; regularly active with a peak aerobic power of 65 ml-kg LBM1(-)-min1(-)) or untrained (UT; sedentary with a peak aerobic power of 53 ml-kg LBM1(-)-min1(-)) with high (High; 20%) or low (Low; 11%) body fatness. Subjects exercised until exhaustion or until rectal temperature reached 39.5C or heart rate reached 95% of maximum. Exercise times were significantly greater in T Low (116 + or - 6.5 min) compared with their matched sedentary (UT Low; 70 + or - 3.6 min) or fatness (T High; 82 + or - 3.9 min) counterparts, indicating an advantage for both a high aerobic fitness and low body fatness. However, similar effects were not evident between T High and UT High (74 + or - 4.1 min) or between the UT groups (UT Low and UT High). TRUNCATED
Aerobic fitness;Body fatness;Acclimatisation;Heat storage;Rectal temperature
Report Number
DCIEM-SL-2001-033 — Scientific Literature
Date of publication
01 Feb 2002
Number of Pages
Reprinted from
J Appl Physiol, vol 91, 2001, p 2055-2001
Hardcopy;Document Image stored on Optical Disk

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