NDLI: The effects of age on stabilization of the mediolateral trajectory of the swing foot.

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The effects of age on stabilization of the mediolateral trajectory of the swing foot.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Krishnan, Vennila Rosenblatt, Noah J. Latash, Mark L. Grabiner, Mark D.
Description	Country affiliation: United States Author Affiliation: Krishnan V ( Department of Kinesiology and Nutrition, University of Illinois at Chicago, IL 60612, United States.)
Abstract	To ensure stability during gait, mediolateral placement of the swinging foot must be actively regulated. Logically this occurs through end-point control of the swing limb trajectory, the precision of which is quantified as step-width variability (SWV). Increased SWV with age may reflect reduced precision of this control, but cannot describe if, and how, age-related changes in lower limb kinematic synergies account for reduced precision. We analyzed joint configuration variance across steps within the uncontrolled manifold (UCM) hypothesis, which assumes that redundant sets of elemental variables are organized by the central nervous system to stabilize important performance variables. We tested whether: (1) regardless of age, the swing limb trajectory would be stabilized by a kinematic synergy of the lower limbs, and (2) the strength of the synergy would be weaker in older adults. Ten younger and ten older adults (65+ years) walked on a laboratory walkway at their preferred speed while kinematic data were collected. UCM analysis of segmental configuration variance was performed with respect to the mediolateral trajectory of the swing-limb ankle joint center. Throughout most of swing, the trajectory was stabilized by a kinematic synergy. Despite the greater segmental configuration variance of older adults, the strength of the synergy was not significantly different between groups. Moreover, the synergy index became negative during terminal swing and was not significantly correlated with SWV. Accordingly, co-variation among individual segmental trajectories is more important for stabilization of the swing trajectory during mid-swing, and, throughout swing, aging does not appear to affect this stabilization.
File Format	HTM / HTML
ISSN	09666362
Issue Number	4
Volume Number	38
e-ISSN	18792219
Journal	Gait & Posture
Language	English
Publisher	Elsevier
Publisher Date	2013-09-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Orthopedics Movement Gait Humans Journal Article Leg Young Adult Ankle Joint Biomechanical Phenomena Aging Adult Physiology Aged
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Rehabilitation Biophysics Sports Science

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