NDLI: Energy flow analysis of the lower extremity during gait in persons with chronic stroke.

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Energy flow analysis of the lower extremity during gait in persons with chronic stroke.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Novak, Alison C. Li, Qingguo Yang, Shuozhi Brouwer, Brenda
Description	Country affiliation: Canada Author Affiliation: Novak AC ( Toronto Rehabilitation Institute, Toronto, ON, Canada); Li Q ( Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada.); Yang S ( Department of Mechanical and Materials Engineering, Queen's University, Kingston, ON, Canada.); Brouwer B ( School of Rehabilitation Therapy, Queen's University, Kingston, ON, Canada. Electronic address: brouwerb@queensu.ca.)
Abstract	BACKGROUND: A decline in walking capacity and high energy cost can limit mobility following stroke. Mechanical energy exchange between lower limb and trunk segments can reflect gait inefficiencies, but reveals little about active energy flow between adjacent segments through muscle actions. This study evaluated mechanical energy expenditures (MEEs) during walking in stroke and healthy groups to understand movement control and explore the impact of walking speed on mechanical energy exchanges. METHODS: Thirteen adults with hemiparesis and six healthy controls walked at self-selected speed. Power curves for each lower limb joint were segmented into concentric and eccentric sources of muscle power and transfer/no-transfer modes to calculate MEEs during stance. FINDINGS: MEEs were lower in the stroke group on the affected side compared to the less affected side and compared to controls. Specifically, the affected plantarflexors transferred less energy distally via concentric action in late stance compared to the less affected side. However, the stroke group generated greater energy at the ankle in the absence of transfer compared to controls. Less concentrically transferred energy through midstance and absorbed in late stance was evident by the knee extensors bilaterally in stroke. At the hip, the total energy (no transfer) was reduced on the affected side. Classifying stroke subjects by walking speed (<.6m/s, >.6m/s) revealed disruptions in harnessing energy through motion and transfer energy across segments in the slower group. INTERPRETATION: The limited ability of those with stroke to exploit intersegmental energy transfer to optimize efficiency may limit endurance and functional independence.
File Format	HTM / HTML
ISSN	09666362
Issue Number	2
Volume Number	41
e-ISSN	18792219
Journal	Gait & Posture
Language	English
Publisher	Elsevier
Publisher Date	2015-02-01
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Research Support, Non-u.s. Gov't Discipline Orthopedics Stroke Gait Humans Middle Aged Male Journal Article Physiopathology Young Adult Ankle Joint Walking Energy Metabolism Lower Extremity Adult Female Physiology Energy Transfer Muscle, Skeletal Chronic Disease
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Rehabilitation Biophysics Sports Science

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