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- W2462362281 abstract "Adiposity is considered a factor which impairs thermoregulation during exercise in the heat. In adolescents, previous studies showed either similar or greater increase in rectal temperature (Tre) in obese compared to lean. The differences amongst studies may be due to lack of controlling factors such as metabolic heat production (Hprod), aerobic fitness and hydration levels. PURPOSE: To test the hypothesis that obese, compared to lean, adolescent boys with similar aerobic fitness and hydration levels will have greater Tre increase when exercising in the heat at the same Hprod. METHODS: Subjects were 11 heat-acclimatizated boys (age 12.8±1.5 yrs, Tanner II-IV), five obese and six lean (%fat 38.8±12.4 vs. 15.5±3.6), with similar VO2peak by total muscle mass (70.3±10 vs. 67.7±10.5 mL.kg.min-1). They performed two 25-min exercise bouts, separated by 10-min rest in a controlled hot environment (35°C, 40-45% RH). Subjects cycled at a power output that was clamped at a Hprod of 5.5W.kg-1 calculated by VO2 and VCO2 that were measured continuously. Tre and skin (Tskin) temperatures were measured continuously. Body mass was measured before, and after each bout to calculate sweat volume. Boys were kept hydrated as water volume intake at rest between the exercise bouts was similar to fluid loss from the 1st bout. Results are expressed as mean±SD. RESULTS: The increase in Tre was not different in obese (0.18±0.3°C) and lean (0.25±0.22°C) boys at the end of exercise. Pooling all boys, no significant relationship was observed between ΔTre and %fat. Tskin increased similarly between obese (1.4±1.5°C) and lean (0.9±0.6°C) boys by the end of exercise. Total absolute sweat volume was greater (P=0.03) in obese (310±101 vs. 167±75 mL); but, non-significant when corrected by body surface area (obese: 162±48, lean: 126±73mL.m-2). CONCLUSION: When exercising at the same Hprod in the heat and controlled hydration and fitness levels, no difference was found in Tre increase between groups despite differences in adiposity." @default.
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- W2462362281 date "2016-05-01" @default.
- W2462362281 modified "2023-09-26" @default.
- W2462362281 title "Thermoregulatory Response of Obese and Lean Adolescent Boys Cycling at the Same Metabolic Heat Production" @default.
- W2462362281 doi "https://doi.org/10.1249/01.mss.0000486680.88997.88" @default.
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