title: Adaptation of pulmonary oxygen consumption slow component following 6 weeks of exercise training above and below the lactate threshold in untrained men.
abstract: OBJECTIVE
  To examine the effects of 6 weeks of exercise training above or below the lactate threshold (LT) on the slow component (SC) of pulmonary oxygen consumption (.VO(2)).
  
  
  METHODS
  Randomized controlled trial.
  
  
  METHODS
  University human performance laboratory.
  
  
  METHODS
  Apparently healthy, untrained men (n = 18).
  
  
  METHODS
  Subjects were randomized to one of three groups: high-intensity exercise training (HI) [above the LT], moderate-intensity exercise training (MOD) [below the LT], or no exercise training (CON). Exercise groups performed cycle ergometry 4 d/wk for 6 weeks. Total work throughout training was constant between groups.
  
  
  RESULTS
  Maximal cycle ergometry was performed at baseline and after training to assess power output at the LT (WLT), .VO(2) at the LT (.VO(2)LT), and peak .VO(2) (.VO(2)PK). High-intensity, constant-load cycling was performed at baseline and weeks 1, 2, 4, and 6 to assess SC adaptations. WLT, .VO(2)LT, and .VO(2)PK increased after 6 weeks in both exercise groups compared to the CON group (p < 0.05), although there were no differences between the training groups. SC of .VO(2) decreased 44% in the HI group following 1 week of exercise training vs MOD (20%, p < 0.05) and CON (12%, p < 0.01) groups. The SC attenuation was more prominent at all time points in the HI group compared to the MOD group. Total SC attenuation over the 6-week training period did not differ between the HI (71%) and MOD (57%) groups.
  
  
  CONCLUSIONS
  Training at HI or MOD produced similar improvements in the LT, .VO(2), and power output at peak exertion when total work output was held constant. Attenuation of the SC with training above and below the LT were similar, although above-LT training promoted faster SC adaptations.
authors.affiliation: Beth Israel Deaconess Medical Center, Boston, MA, USA.
authors.forename: Jeffrey V
authors.initials: JV
authors.lastname: Ocel
authors.forename: Larry E
authors.initials: LE
authors.lastname: Miller
authors.forename: Lee M
authors.initials: LM
authors.lastname: Pierson
authors.forename: David F
authors.initials: DF
authors.lastname: Wootten
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Hawkins
authors.forename: Jonathan
authors.initials: J
authors.lastname: Myers
authors.forename: William G
authors.initials: WG
authors.lastname: Herbert
mesh_terms: D000328:Adult; D005080:Exercise Test / Q000379:methods*; D006339:Heart Rate; D006801:Humans; D007773:Lactates / Q000097:blood*; D008297:Male; D010101:Oxygen Consumption; D010809:Physical Fitness / Q000502:physiology
chemical_list: D007773:Lactates