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Longitudinal profiles of oxygen uptake during treadmill walking in able-bodied children: the locomotion energy and growth study |
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| Authors: | Morgan Don W Tseh Wayland Caputo Jennifer L Keefer Daniel J Craig Ian S Griffith Kelly B Akins Mary-Beth Griffith Gareth E Martin Philip E |
| Affiliation: | a Department of Exercise Science and Physical Education, Exercise and Sport Research Institute, Arizona State University, PO Box 870404, Tempe, AZ 85287-0404, USA b Department of Health, Physical Education and Recreation, University of North Carolina at Wilmington, Wilmington, NC 28403, USA c Department of Health, Physical Education, Recreation and Safety, Middle Tennessee State University, Murfreesboro, TN 37132, USA d Department of Wellness and Sport Sciences, Millersville University, Millersville, PA 17551, USA e Department of Exercise and Sport Science, The University of North Carolina at Greensboro, Greensboro, NC 27402, USA |
| Abstract: | The purpose of this study was to document age-related changes in walking VO2 in able-bodied boys and girls. Beginning at age 6 and ending at age 10, 23 children (14 girls, 9 boys) performed six 5-min bouts of level treadmill walking at 0.67, 0.89, 1.12, 1.34, 1.56, and 1.79 m s−1 on an annual basis. Prior to data collection, subjects received 60 min of treadmill walking practice. During the last 2 min of each walking bout, a 2-min sample of expired air was collected in a meteorological balloon and analyzed to determine VO2. Averaged across age, interindividual variation in VO2 ranged from 32 to 41%. Repeated-measures analysis of variance demonstrated a speed by age interaction for VO2, such that mean VO2 rose (P≤0.05) across the five fastest speeds for 6-, 7-, 8-, and 10-year olds and increased over the entire speed range for 9-year olds. For all speeds, VO2 decreased yearly from the ages of 6 to 8. When averaged across speeds, VO2 was 27% higher for 6-year olds compared with 10-year olds. From a clinical perspective, access to longitudinal measurements of walking VO2 in able-bodied children should be helpful in interpreting gait energy use in children with movement disorders and evaluating treatment strategies designed to reduce the aerobic demand of locomotion in youth with impaired mobility. |
| Keywords: | Locomotion Oxygen uptake Walking Children |
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