Document Detail


Differential leg function in a sprawled-posture quadrupedal trotter.
MedLine Citation:
PMID:  16391347     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Legs of sprawled-posture, quadrupedal trotting geckos (Hemidactylus garnotii) each functioned differently during constant average-speed locomotion. The center of mass decelerated in the first half of a step and accelerated in the second half, as if geckos were bouncing in fore-aft and side-to-side directions. Forelegs decelerated the center of mass only in the fore-aft direction. Hindlegs provided all the acceleration in the latter half of the step. Lateral ground reaction forces were always directed toward the midline and exceeded the magnitude of fore-aft forces. The differential leg function of sprawled-posture geckos resembled sprawled-posture hexapods more than upright-posture quadrupeds. The pattern of leg ground reaction forces observed may provide passive, dynamic stability while minimizing joint moments, yet allow high maneuverability. Integrating limb dynamics with whole body dynamics is required to resolve the trade-offs, if any, that result from stable sprawled-posture running with differential leg function.
Authors:
J J Chen; A M Peattie; K Autumn; R J Full
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  The Journal of experimental biology     Volume:  209     ISSN:  0022-0949     ISO Abbreviation:  J. Exp. Biol.     Publication Date:  2006 Jan 
Date Detail:
Created Date:  2006-01-04     Completed Date:  2006-11-08     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0243705     Medline TA:  J Exp Biol     Country:  England    
Other Details:
Languages:  eng     Pagination:  249-59     Citation Subset:  IM    
Affiliation:
Department of Integrative Biology, University of California Berkeley, 94720-3140, USA.
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MeSH Terms
Descriptor/Qualifier:
Analysis of Variance
Animals
Biomechanics
Forelimb / physiology*
Gait*
Hindlimb / physiology*
Lizards / genetics*
Locomotion / physiology*
Posture*

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


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