title: Prediction of the aerobic demand of walking in children.
abstract: OBJECTIVE
  The purpose of this study was to develop a generalized equation to predict VO2 during level treadmill walking in young boys and girls.
  
  
  METHODS
  On an annual basis from ages 6 to 10, 23 able-bodied children (14 girls, 9 boys) completed six 5-min walking bouts at speeds ranging from 40.2 to 107.2 m x min(-1). Before testing, each child received 60 min of treadmill walking practice. During the last 2 min of each walking trial, a 2-min sample of expired gas was collected in a meteorological balloon and analyzed to determine VO2.
  
  
  RESULTS
  Stepwise regression analyses indicated that the following equation was best suited to predict walking VO2: VO2 = 24.852 + 0.003214 (walking speed in m x min(-1))2 - 0.995 (age in yr) - 0.263 (walking speed); R = 0.95; SEE = 1.74 mL x kg(-1) x min(-1). Bland-Altman analysis revealed that 95% of the differences between actual and predicted VO2 values fell within a range of 3.39 to -3.43 mL x kg(-1) x min(-1).
  
  
  CONCLUSIONS
  We conclude that VO2 during level treadmill walking can be predicted accurately in healthy young children.
authors.affiliation: Department of Kinesiology, Arizona State University, P.O. Box 870404, Tempe, AZ 85287-0404, USA. dwmorgan@asu.edu
authors.forename: Don W
authors.initials: DW
authors.lastname: Morgan
authors.forename: Wayland
authors.initials: W
authors.lastname: Tseh
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Caputo
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Keefer
authors.forename: Ian S
authors.initials: IS
authors.lastname: Craig
authors.forename: Kelly B
authors.initials: KB
authors.lastname: Griffith
authors.forename: Mary-Beth
authors.initials: MB
authors.lastname: Akins
authors.forename: Gareth E
authors.initials: GE
authors.lastname: Griffith
authors.forename: Gary S
authors.initials: GS
authors.lastname: Krahenbuhl
authors.forename: Philip E
authors.initials: PE
authors.lastname: Martin
mesh_terms: D002648:Child; D002669:Child Welfare; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test; D005260:Female; D006801:Humans; D008124:Locomotion / Q000502:physiology; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D011237:Predictive Value of Tests; D012044:Regression Analysis; D016138:Walking / Q000502:physiology*