title: Effects of an 8-month exercise training program on off-exercise physical activity.
abstract: OBJECTIVE
  An active lifestyle is widely recognized as having a beneficial effect on cardiovascular health. However, no clear consensus exists as to whether exercise training increases overall physical activity energy expenditure (PAEE) or whether individuals participating in regular exercise compensate by reducing their off-exercise physical activity. The purpose of this study was to evaluate changes in PAEE in response to aerobic training (AT), resistance training (RT), or combined aerobic and resistance training (AT/RT).
  
  
  METHODS
  Data are from 82 participants in the Studies of Targeted Risk Reduction Interventions through Defined Exercise-Aerobic Training versus Resistance Training study, a randomized trial of overweight (body mass index = 25-35 kg·m(-2)) adults, in which participants were randomized to receive 8 months of AT, RT, or AT/RT. All subjects completed a 4-month control period before randomization. PAEE was measured using triaxial RT3 accelerometers, which subjects wore for a 5- to 7-d period before and after the exercise intervention. Data reduction was performed with a previously published computer-based algorithm.
  
  
  RESULTS
  There was no significant change in off-exercise PAEE in any of the exercise training groups. We observed a significant increase in total PAEE that included the exercise training, in both AT and AT/RT but not in RT.
  
  
  CONCLUSIONS
  Eight months of exercise training was not associated with a compensatory reduction in off-exercise physical activity, regardless of exercise modality. The absence of compensation is particularly notable for AT/RT subjects, who performed a larger volume of exercise than did AT or RT subjects. We believe that the extended duration of our exercise training program was the key factor in allowing subjects to reach a new steady-state level of physical activity within their daily lives.
authors.affiliation: Division of Cardiology, Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.
authors.forename: Vikram V
authors.initials: VV
authors.lastname: Rangan
authors.forename: Leslie H
authors.initials: LH
authors.lastname: Willis
authors.forename: Cris A
authors.initials: CA
authors.lastname: Slentz
authors.forename: Lori A
authors.initials: LA
authors.lastname: Bateman
authors.forename: A Tamlyn
authors.initials: AT
authors.lastname: Shields
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Houmard
authors.forename: William E
authors.initials: WE
authors.lastname: Kraus
mesh_terms: D000328:Adult; D004734:Energy Metabolism; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009043:Motor Activity / Q000502:physiology*; D050177:Overweight / Q000503:physiopathology*; D055070:Resistance Training