Document Detail

Kinetic mechanisms to alter walking speed.
MedLine Citation:
PMID:  17920886     Owner:  NLM     Status:  MEDLINE    
A mechanism to modulate speed during human walking has not yet been proposed in the literature, even though changing walking speed is likely a necessary attribute of everyday ambulation. To understand how joint kinetics modulate walking speed 12 normal adults walked Fast (1.4m/s), Slow (1.0m/s), Accel (1.0-1.4m/s) and Decel (1.4-1.0m/s) trials while full body 3D kinematics and kinetics were collected. Reduced sagittal ankle plantarflexor moments were observed in Accel trials during early single limb stance (p<0.001) and increased sagittal plantarflexor moments were seen in Decel trials during early single limb stance (p<0.001) compared to steady speed walking. Modulating the sagittal ankle moment altered the center of pressure location and either attenuated (Accel) or accentuated (Decel) the early stance braking impulse to accelerate or decelerate the center of mass. The onset of walking speed changes occurred at approximately 15% of the gait cycle and did not support the concept of "controlled falling". Sagittal ankle push-off power appears a consequence of increased walking speed, but not the causative factor to increase walking speed.
Michael S Orendurff; Greta C Bernatz; Jason A Schoen; Glenn K Klute
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2007-10-25
Journal Detail:
Title:  Gait & posture     Volume:  27     ISSN:  0966-6362     ISO Abbreviation:  Gait Posture     Publication Date:  2008 May 
Date Detail:
Created Date:  2008-04-09     Completed Date:  2008-09-23     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9416830     Medline TA:  Gait Posture     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  603-10     Citation Subset:  IM    
Motion Analysis Laboratory, Center of Excellence for Limb Loss Prevention and Prosthetic Engineering, Rehabilitation Research and Development, Veterans Administration Puget Sound Health Care System, Seattle, WA, USA.
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MeSH Terms
Lower Extremity / physiology*
Walking / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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