Predicting walking METs and energy expenditure from speed or accelerometry

Anthony G. Brooks, Simon M. Gunn, Robert T. Withers, Christopher J. Gore, John L. Plummer

Research output: Contribution to journalArticle

45 Citations (Scopus)

Abstract

Purpose: a) Compare the predictive potential of speed and CSAhip (Computer Science Applications accelerometer positioned on the hip) for level terrain walking METs (1 MET = VO2 of 3.5 mL·kg -1·min-1) and energy expenditure (kcal·min-1); b) cross-validate previously published CSA hip- and speed-based MET and energy expenditure prediction equations; c) measure self-paced walking speed, exercise intensity (METs) and energy expenditure in the middle aged population. Methods: Seventy-two 35- to 45-yr-old volunteers walked around a level, paved quadrangle at what they perceived to be a moderate pace. Oxygen consumption was measured using the criterion Douglas bag technique. Speed, CSAhip, heart rate, and Borg rating of perceived exertion were also monitored. Results: Speed explained 10% more variance of walking METs than CSAhip. Speed and mass explained 8% more variance of walking energy expenditure (kcal·min-1) than CSAhip and mass. The best previously published regression equations predict our walking METs and energy expenditures within 95% prediction limits of ± 0.7 METs (8) and ± 1.0 kcal·min-1 (23), respectively. Women paced themselves at a significantly higher mean speed (5.5 km·h-1) and intensity (4.1 METs) than their male counterparts (5.2 km·h-1 and 3.8 METs). Both genders expended ∼0.75 kcal·kg-1 for every kilometer of level terrain walked. Conclusion: Speed-based MET and energy expenditure predictions during level terrain walking were more accurate than those utilizing CSAhip.

Original languageEnglish
Pages (from-to)1216-1223
Number of pages8
JournalMedicine and Science in Sports and Exercise
Volume37
Issue number7
DOIs
Publication statusPublished - 1 Jul 2005

Keywords

  • CSA
  • MTI
  • Self-paced
  • Velocity

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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