Isolating the independent influence of body fat on thermoregulatory responses to exercise
To the Editor
A recent publication by Adams et al. (2014) reported similar core and skin temperature responses between two groups of obese (77.5 kg, 43.5 % body fat) and non-obese (53.7 kg, 26.3 % body fat) females cycling at fixed absolute (in W) and relative (to body surface area; in W/m2) rates of metabolic heat production. The authors concluded that more body fat in young females does not contribute to a greater heat strain. However, recent evidence demonstrates that the change in core temperature during exercise is determined by the rate of metabolic heat production (Hprod) per unit body mass (in W/kg) (Cramer and Jay 2014); and under conditions that permit the complete evaporation of sweat from the skin surface, whole-body sweat losses are determined by the absolute evaporative requirement for heat balance (Ereq, in W) (Gagnon et al. 2013), which is primarily driven by absolute Hprod. It follows that when comparing changes in core temperature between two groups of dissimilar...
KeywordsCore Temperature Obese Group Skin Blood Flow Sweat Rate Total Body Mass
- Adams JD, Ganio MS, Burchfield JM, Matthews AC, Werner RN, Chokbengboun AJ, Dougherty EK, LaChance AA (2014) Effects of obesity on body temperature in otherwise-healthy females when controlling hydration and heat production during exercise in the heat. Eur J Appl Physiol. doi: 10.1007/s00421-014-3002-y [Epub ahead of Print; Sep. 26]Google Scholar