Explained variance in the thermoregulatory responses to exercise: the independent roles of biophysical and fitness/fatness-related factors

Journal of Applied Physiology
Matthew N Cramer, Ollie Jay

Abstract

Individual variation in the thermoregulatory responses to exercise is notoriously large. Although aerobic fitness (V̇o2 max) and body fatness are traditionally considered important predictors of individual core temperature and sweating responses, recent evidence indicates potentially important and independent roles for biophysical factors. Using stepwise regression, we examined the proportion of individual variability in rectal temperature changes (ΔTre), whole body sweat loss (WBSL), and steady-state local sweat rate (LSRss) independently described by 1) biophysical factors associated with metabolic heat production (Hprod) and evaporative heat balance requirements (Ereq) relative to body size and 2) factors independently related to V̇o2 max and body fatness. In a total of 69 trials, 28 males of wide-ranging morphological traits and V̇o2 max values cycled at workloads corresponding to a range of absolute Hprod (410-898 W) and relative intensities (32.2-82.0% V̇o2 max) for 60 min in 24.8 ± 0.7°C and 33.4 ± 12.2% relative humidity. Hprod (in W/kg total body mass) alone described ∼50% of the variability in ΔTre (adjusted to r(2) = 0.496; P < 0.001), whereas surface area-to-mass ratio and body fat percentage (BF%) explained an addi...Continue Reading

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Citations

Mar 15, 2016·Autonomic Neuroscience : Basic & Clinical·Matthew N Cramer, Ollie Jay
Jul 28, 2016·European Journal of Applied Physiology·Marlene GiandoliniGuillaume Y Millet
Oct 19, 2017·Medicine and Science in Sports and Exercise·Bryce N BalmainSurendran Sabapathy
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Dec 21, 2018·International Journal of Sports Physiology and Performance·Christopher Byrne, Jason K W Lee
Sep 17, 2019·Medicine and Science in Sports and Exercise·Matthew N CramerCraig G Crandall
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May 26, 2021·Medicine and Science in Sports and Exercise·Nicole T VargasZachary J Schlader

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