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Related Experiment Videos

Metabolic response to graded downhill walking

D M Wanta1, F J Nagle, P Webb

  • 1Biodynamics Laboratory, University of Wisconsin, Madison 53706.

Medicine and Science in Sports and Exercise
|January 1, 1993
PubMed
Summary

Downhill walking energy cost decreases to a minimum around -9% to -12% grade before increasing again. This study precisely mapped the oxygen consumption (VO2) curve during progressive downhill treadmill walking.

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Area of Science:

  • Exercise Physiology
  • Biomechanics
  • Human Locomotion

Background:

  • Downhill walking energy cost varies with grade, with an estimated minimum around -9%.
  • Previous research provides a general understanding, but precise energy cost curves require detailed investigation.

Purpose of the Study:

  • To precisely map the oxygen consumption (VO2) energy cost curve during progressive downhill treadmill walking.
  • To identify the specific grade at which net VO2 is minimized at different walking speeds.

Main Methods:

  • Ten healthy men walked on a treadmill at 90 and 105 m.min-1 across grades from 0% to -18%.
  • Gas exchange was measured using open-circuit spirometry to determine net VO2.
  • Heart rate and stride frequency were monitored throughout the trials.

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Main Results:

  • Net VO2 generally decreased with increasing downhill grade to -9% and -12% at 90 and 105 m.min-1, respectively.
  • Minimum net VO2 values were not significantly different from adjacent grades (-6% and -15%).
  • VO2 at 0%, -3%, and -18% grades differed significantly from other grades at both speeds.

Conclusions:

  • The minimum energy cost for downhill walking occurs within a range of grades, approximately -9% to -12%.
  • Energy cost increases significantly at very shallow (0%, -3%) and very steep (-18%) downhill grades.
  • These findings refine our understanding of the biomechanics and energetics of downhill locomotion.