title: Body fatness, body core temperature, and heat loss during moderate-intensity exercise.
abstract: OBJECTIVE
  This study examined the influence of body fatness on body core temperature and heat loss responses during moderate-intensity exercise.
  
  
  METHODS
  Nine men with lower body fat and eight men with higher body fat, matched for aerobic fitness, completed 1 h of recumbent cycling at the same absolute intensity in a warm environment (30 degrees C, 40% RH). Percent body fat was measured by hydrostatic weighing, using oxygen dilution to determine residual volume. Esophageal temperature (T(es)), mean skin temperature (T(sk)), and local sweat rate (m(sw)) were measured at rest and continuously during exercise while forearm blood flow (FBF) was measured at rest and every 10 min during exercise.
  
  
  RESULTS
  The lower body fat and higher body fat groups were successfully matched for aerobic fitness, removing the influence of body fatness, given that V/O2(peak) was 50.72 +/- 7.34 and 50.43 +/- 5.01 ml x kg LBM(-1) x min(-1), respectively. When compared to lower body fat individuals, % body fat, body surface area (A(D)), and body mass were higher and A(D)/ mass was lower in higher body fat individuals. T(es), T(sk), FBF, m(sw), and the slope of m(sw):T(es) were not different between groups. Metabolic heat production was similar between the lower body fat (299.7 +/- 40.5 W x m(-2)) and higher body fat (288.1 +/- 30.6 W x m(-2)) subjects, respectively. Dry and evaporative heat loss, as well as heat storage during exercise, were not different between groups.
  
  
  CONCLUSIONS
  These data suggest that there is no effect of body fatness on body core temperature or heat loss responses during moderate-intensity exercise in a warm environment.
authors.affiliation: Department of Adolescent and Adult Education, Armstrong Atlantic State University, 11935 Abercorn St., Savannah, GA 31419, USA.
authors.forename: Jayme D
authors.initials: JD
authors.lastname: Limbaugh
authors.forename: Gregory S
authors.initials: GS
authors.lastname: Wimer
authors.forename: Lynn H
authors.initials: LH
authors.lastname: Long
authors.forename: William H
authors.initials: WH
authors.lastname: Baird
mesh_terms: D050154:Adiposity / Q000502:physiology*; D000328:Adult; D001831:Body Temperature / Q000502:physiology*; D001833:Body Temperature Regulation / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005260:Female; D018882:Heat Stress Disorders / Q000503:physiopathology; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D055815:Young Adult