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- W2004452673 abstract "Studies show that, in parallel to the rapid decrease in metabolic heat production following cessation of exercise, there is a rapid decline in local skin blood flow and sweating to pre-exercise levels during the early stages of recovery. Consequently, a prolonged sustained elevation of core and muscle temperature relative to pre-exercise rest, which is dependent upon the intensity of exercise, is evidenced. It is unclear, however, if this pattern of response is due to a greater thermal inertia (i.e., the time taken to balance the differential rates of heat production and heat loss) during exercise as opposed to during recovery. PURPOSE: We investigated heat balance during and following exercise of different intensities using a whole-body calorimeter regulated to an ambient air temperature of 30°C. METHODS: Six physically active males performed 60-min of cycling at a constant rate of metabolic heat production of either: 1) 200 (L); 2) 350 (M) or; 3) 500 (H) Watts followed by 60-min of seated rest. RESULTS: Exercise resulted in a change in body heat content of +227±37, +308±40 and +396±31 kJ for the L, M and H exercise conditions respectively. Values were significantly different between L and H only (p<0.05). This was paralleled by a corresponding increase in rectal temperature of 0.18±07, 0.56±11 and 0.84±06°C for L, M and H respectively. Postexercise, there were no differences in the rates of metabolic heat production and whole-body heat loss between the three conditions. Consequently, the magnitude of change of body heat content was similar between conditions (i.e., -46±6, -56±8, and -70±8 kJ for L, M and H respectively). Only ∼21, 19 and 18% of the change in body heat content during exercise was dissipated postexercise for L, M and H respectively. This was paralleled by a sustained elevation in rectal temperature above baseline resting equal to 0.15±0.04, 0.30±0.06 and 0.41±0.09°C for the L, M and H conditions respectively. CONCLUSIONS: The exercise intensity dependent increase in the postexercise elevation in core temperature is likely associated with a greater thermal inertia during recovery and not exercise. Funding support from the Natural Sciences and Engineering Research Council of Canada." @default.
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- W2004452673 date "2010-05-01" @default.
- W2004452673 modified "2023-09-25" @default.
- W2004452673 title "Calorimetric Evidence for an Exercise Intensity Dependent Increase in the Level of Postexercise Hyperthermia" @default.
- W2004452673 doi "https://doi.org/10.1249/01.mss.0000386484.40794.22" @default.
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