title: Effect of prior exercise on VO(2) slow component is not related to muscle temperature.
abstract: BACKGROUND
  It has been widely reported that the VO(2) slow component is reduced in the second of two bouts of heavy exercise. It has also been shown that an increase in muscle temperature (Tm) produced by wearing hot-water-perfused pants causes a reduction in the VO(2) slow component. Therefore, the aim of this study was to investigate whether the effect of prior heavy exercise on the VO(2) slow component of subsequent heavy exercise is related to the warming-up of the exercising limbs.
  
  
  METHODS
  Six male subjects completed an exercise protocol consisting of two constant-load exercise bouts (EX-1 and EX-2) at 90% VO(2peak), separated by 6 min of rest. The Tm of the m. vastus lateralis was measured with an indwelling thermistor. Seven days later, the subjects completed a second exercise protocol consisting of a passive warming-up of the upper legs until the same Tm was reached as after EX-1, followed by a constant-load work bout (EX-3) identical to EX-1 and EX-2.
  
  
  RESULTS
  Tm reached comparable levels at the start of EX-2 and EX-3 (37.3 +/- 0.6 degrees C and 37.2 +/- 0.3 degrees C, respectively). The VO(2) slow component (measured as deltaVO(2)(6-2 min)) was reduced by 57% after prior heavy exercise ( < 0.05), whereas no significant reduction was observed after prior passive warming-up.
  
  
  CONCLUSIONS
  The results of this study indicate that the reduction in VO(2) slow component observed after prior heavy exercise cannot be explained by an increase in muscle temperature of the upper legs.
authors.affiliation: Department of Movement and Sports Sciences, Ghent University, Belgium.
authors.forename: Katrien
authors.initials: K
authors.lastname: Koppo
authors.forename: Andrew M
authors.initials: AM
authors.lastname: Jones
authors.forename: Luc
authors.initials: L
authors.lastname: Vanden Bossche
authors.forename: Jacques
authors.initials: J
authors.lastname: Bouckaert
mesh_terms: D000222:Adaptation, Physiological / Q000502:physiology; D000328:Adult; D001642:Bicycling / Q000502:physiology*; D001831:Body Temperature / Q000502:physiology*; D017079:Exercise Tolerance / Q000502:physiology; D006801:Humans; D018482:Muscle, Skeletal / Q000502:physiology*; D010101:Oxygen Consumption / Q000502:physiology*; D012146:Rest