Journal
NEUROREPORT
Volume 13, Issue 9, Pages 1171-1174Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/00001756-200207020-00020
Keywords
air-stepping; body weight unloading; contact forces; foot trajectory; two-thirds power law; walking
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Are there general rules for the generation of curvilinear motion of the end-effector? Form and kinematics of the arm trajectory are typically inter-related. A relationship between velocity and curvature of the endpoint path has been previously described and quantified as the two-thirds power law. Here we show that the two-thirds power law holds also for the foot trajectory (during the swing phase) in human locomotion for a wide range of walking speeds and gravitational loads, but air-stepping. In air-stepping, it was violated systematically. The results suggest that the power law represents a general constrain of biological motion, may be attributed to both mechanical and neural factors and can depend on natural interactions with external environment.
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