title: Aerobic Fitness Indices of Children Differed Not by Body Weight Status but by Level of Engagement in Physical Activity.
abstract: BACKGROUND
  Moderate-to-vigorous physical activity (MVPA) improves aerobic fitness in children, which is usually assessed by maximal oxygen consumption. However, other indices of aerobic fitness have been understudied.
  
  
  OBJECTIVE
  To compare net oxygen (VO2net), net energy consumption (Enet), net mechanical efficiency (MEnet), and lipid oxidation rate in active and inactive children across body weight statuses.
  
  
  METHODS
  The sample included normal-weight, overweight, and obese children of whom 44 are active (≥30 min of MVPA/d) and 41 are inactive (<30 min of MVPA/d). VO2net, Enet, MEnet and lipid oxidation rate were determined during an incremental maximal cycling test.
  
  
  RESULTS
  Active obese participants had significantly lower values of VO2net and Enet and higher MEnet than inactive obese participants at all load stages. In addition, active obese participants showed a significantly higher lipid oxidation rate compared with inactive obese and active overweight and normal-weight participants. VO2net, Enet, and MEnet were similar across active children, regardless of body weight status.
  
  
  CONCLUSIONS
  Thirty minutes or more of MVPA per day is associated with a potentiation of aerobic fitness indicators in obese prepubertal children. Moreover, the indices of aerobic fitness of inactive obese children are significantly different from those of active obese and nonobese ones.
authors.affiliation: School of Kinesiology and Leisure, Faculty of Health and Community Services, Université de Moncton, NB, Canada.
authors.forename: Georges
authors.initials: G
authors.lastname: Jabbour
authors.forename: Melanie
authors.initials: M
authors.lastname: Henderson
authors.forename: Angelo
authors.initials: A
authors.lastname: Tremblay
authors.forename: Marie Eve
authors.initials: ME
authors.lastname: Mathieu
mesh_terms: D001835:Body Weight / Q000502:physiology*; D002648:Child; D015444:Exercise / Q000502:physiology*; D005260:Female; D006801:Humans; D008297:Male; D009765:Obesity; D010101:Oxygen Consumption / Q000502:physiology*