title: Exercise intensity influences nonexercise activity thermogenesis in overweight and obese adults.
abstract: OBJECTIVE
  The purpose of this study was to determine the effect of acute bouts of moderate- and high-intensity walking exercise on nonexercise activity thermogenesis (NEAT) in overweight and obese adults.
  
  
  METHODS
  Sixteen participants performed a single bout of either moderate-intensity walking exercise (MIE) or high-intensity walking exercise (HIE) on two separate occasions. The MIE consisted of walking for 60 min on a motorized treadmill at 6 km·h(-1). The 60-min HIE session consisted of walking in 5-min intervals at 6 km·h(-1) and 10% grade followed by 5 min at 0% grade. NEAT was assessed by accelerometer 3 d before, on the day of, and 3 d after the exercise sessions.
  
  
  RESULTS
  There was no significant difference in NEAT vector magnitude (counts per minute) between the preexercise period (days 1-3) and the exercise day (day 4) for either the MIE or the HIE protocol. In addition, there was no change in NEAT during the 3 d after the MIE session; however, NEAT increased by 16% on day 7 (postexercise) compared with the exercise day (P = 0.32). However, during the postexercise period after the HIE session, NEAT was increased by 25% on day 7 compared with the exercise day (P = 0.08) and by 30%-33% compared with the preexercise period (days 1, 2, and 3; P = 0.03, 0.03, and 0.02, respectively).
  
  
  CONCLUSIONS
  A single bout of either MIE or HIE did not alter NEAT on the exercise day or on the first 2 d after the exercise session. However, monitoring NEAT on a third day allowed the detection of a 48-h delay in increased NEAT after performing HIE. A longer-term intervention is needed to determine the effect of accumulated exercise sessions over a week on NEAT.
authors.affiliation: School of Human Movement Studies, Institute of Health and Biomedical Innovation, Queensland University of Technology, Queensland, Australia. Alahmadi@ksu.edu.sa
authors.forename: Mohammad A
authors.initials: MA
authors.lastname: Alahmadi
authors.forename: Andrew P
authors.initials: AP
authors.lastname: Hills
authors.forename: Neil A
authors.initials: NA
authors.lastname: King
authors.forename: Nuala M
authors.initials: NM
authors.lastname: Byrne
mesh_terms: D056044:Actigraphy / Q000295:instrumentation; D000328:Adult; D018592:Cross-Over Studies; D005080:Exercise Test; D006801:Humans; D008297:Male; D009765:Obesity; D050177:Overweight; D005082:Physical Exertion / Q000502:physiology*; D022722:Thermogenesis / Q000502:physiology*; D016138:Walking / Q000502:physiology; D055815:Young Adult