title: Heat production and storage are positively correlated with measures of body size/composition and heart rate drift during vigorous running.
abstract: The purposes of this study were to determine the relationships between: (a) measures of body size/composition and heat production/storage, and (b) heat production/storage and heart rate (HR) drift during running at 95% of the velocity that elicited lactate threshold, which was determined for 20 healthy recreational male runners. Subsequently, changes in skin and tympanic temperatures associated with a vigorous 20-min run, HR, and VO2 data were recorded. It was found that heat production was significantly correlated with body mass (r = .687), lean mass (r = .749), and body surface area (BSA, r = .699). Heat storage was significantly correlated with body mass (r = .519), fat mass (r = .464), and BSA (r = .498). The percentage of produced heat stored was significantly correlated with body mass (r = .427), fat mass (r = .455), and BSA (r = .414). Regression analysis showed that the sum of body mass, percentage of body fat, BSA, lean mass, and fat mass accounted for 30% of the variability in heat storage. It was also found that HR drift was significantly correlated with heat storage (r = .383), percentage of produced heat stored (r = .433), and core temperature change (r = .450). It was concluded that heavier runners experienced greater heat production, heat storage, and core temperature increases than lighter runners during vigorous running.
authors.affiliation: University of Nebraska at Omaha, USA. rjburesh@unmc.edu
authors.forename: Robert
authors.initials: R
authors.lastname: Buresh
authors.forename: Kris
authors.initials: K
authors.lastname: Berg
authors.forename: John
authors.initials: J
authors.lastname: Noble
mesh_terms: D000328:Adult; D001823:Body Composition / Q000502:physiology*; D049628:Body Size / Q000502:physiology*; D001831:Body Temperature / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D012420:Running / Q000502:physiology*; D022722:Thermogenesis / Q000502:physiology*