Stepping over an obstacle on a compliant travel surface reveals adaptive and maladaptive changes in locomotion patterns

Experimental Brain Research
Michael J MacLellan, Aftab E Patla

Abstract

Adaptive human locomotion is dependent on safe clearance of obstacles encountered in the path of locomotion. When the terrain is uneven or compliant, stability along with safe obstacle clearance are competing demands presented to the central nervous system (CNS). To examine how the CNS deals with the two competing demands, six participants walked under four conditions: normal ground walking, normal ground walking with an obstacle in the travel path, compliant surface walking, and compliant surface walking with an obstacle in the travel path. Full body kinematics were measured and swing limb kinetics were derived from these measurements. Results showed that on a compliant surface, the CNS was able to decrease foot placement variability at foot contact when approaching an obstacle, similar to the normal ground terrain. Limb trajectory over the obstacle showed that toe elevation was maintained while clearance over the obstacle was lower in the compliant surface condition due to depression of the surface during push off. This illustrates that the CNS controls toe elevation, not toe clearance when stepping over an obstacle. Work done in the knee during elevation and hip during lowering was similar in the compliant and ground conditi...Continue Reading

References

Aug 5, 1999·Journal of Biomechanics·D P FerrisC T Farley
May 8, 2003·IEEE Engineering in Medicine and Biology Magazine : the Quarterly Magazine of the Engineering in Medicine & Biology Society·Aftab E Patla
May 6, 2004·Medicine and Science in Sports and Exercise·Elizabeth C HardinJoseph Hamill
Jun 1, 2004·Journal of Applied Physiology·Chet T Moritz, Claire T Farley
Nov 3, 2004·Journal of Biomechanics·A L HofW E Sinke
Dec 29, 2004·Clinical Biomechanics·Thomas Uthmann, Peter Dauscher
May 13, 2005·Journal of Neurophysiology·Daniel S Marigold, Aftab E Patla
Feb 24, 2006·Experimental Brain Research·Michael J MacLellan, Aftab E Patla

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Citations

Mar 10, 2016·Journal of Physical Therapy Science·Gi-Deok ParkYoung-Min Kim
Feb 24, 2009·Gait & Posture·Rachel A BradyJacob J Bloomberg
Feb 6, 2007·Journal of Biomechanics·Keith E Gordon, Daniel P Ferris
Sep 13, 2008·Movement Disorders : Official Journal of the Movement Disorder Society·Alison R OatesFay B Horak
Apr 15, 2014·Gait & Posture·Alexander D WrightAndrew C Laing
Aug 28, 2020·Frontiers in Neuroscience·Daniel-Robert ChebatMaurice Ptito

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