Passive mechanical properties of the gastrocnemius after spinal cord injury

Diong, JHL; Herbert, RD; Harvey, LA; Kwah, LK; Clarke, JL; Hoang, PD; Martin, JH; Clarke, EC; Bilston, LE; Gandevia, SC

Passive mechanical properties of the gastrocnemius after spinal cord injury

Diong, JHL Herbert, RD Harvey, LA Kwah, LK

Clarke, JL Hoang, PD Martin, JH Clarke, EC Bilston, LE Gandevia, SC

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Publication Type:: Journal Article
Citation:: Muscle and Nerve, 2012, 46 (2), pp. 237 - 245
Issue Date:: 2012-08-01

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Field	Value	Language
dc.contributor.author	Diong, JHL	en_US
dc.contributor.author	Herbert, RD	en_US
dc.contributor.author	Harvey, LA	en_US
dc.contributor.author	Kwah, LK https://orcid.org/0000-0002-9809-9859	en_US
dc.contributor.author	Clarke, JL	en_US
dc.contributor.author	Hoang, PD	en_US
dc.contributor.author	Martin, JH	en_US
dc.contributor.author	Clarke, EC	en_US
dc.contributor.author	Bilston, LE	en_US
dc.contributor.author	Gandevia, SC	en_US
dc.date.issued	2012-08-01	en_US
dc.identifier.citation	Muscle and Nerve, 2012, 46 (2), pp. 237 - 245	en_US
dc.identifier.issn	0148-639X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/43221
dc.description.abstract	Introduction: In this study we compared passive mechanical properties of gastrocnemius muscle-tendon units, muscle fascicles, and tendons in control subjects and people with ankle contractures after spinal cord injury. Methods:: Passive gastrocnemius length-tension curves were derived from passive ankle torque-angle data obtained from 20 spinal cord injured subjects with ankle contractures and 30 control subjects. Ultrasound images of muscle fascicles were used to partition length-tension curves into fascicular and tendinous components. Results:: Spinal cord injured subjects had stiffer gastrocnemius muscle-tendon units (stiffness index: 74.8 ± 27.0 m -1) than control subjects (54.4 ± 17.7 m -1) (P = 0.004). Muscle-tendon slack lengths, as well as slack lengths and changes in length of fascicles and tendons, were similar in the two groups. Conclusions:: People with ankle contractures after spinal cord injury have stiff gastrocnemius muscle-tendon units. It is not clear whether this reflects changes in properties of muscle fascicles or tendons. copy; 2012 Wiley Periodicals, Inc..	en_US
dc.relation.ispartof	Muscle and Nerve	en_US
dc.relation.isbasedon	10.1002/mus.23356	en_US
dc.subject.classification	Neurology & Neurosurgery	en_US
dc.subject.mesh	Muscle, Skeletal	en_US
dc.subject.mesh	Tendons	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Spinal Cord Injuries	en_US
dc.subject.mesh	Range of Motion, Articular	en_US
dc.subject.mesh	Muscle Contraction	en_US
dc.subject.mesh	Biomechanics	en_US
dc.subject.mesh	Stress, Mechanical	en_US
dc.subject.mesh	Adult	en_US
dc.subject.mesh	Aged	en_US
dc.subject.mesh	Middle Aged	en_US
dc.subject.mesh	Female	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Biomechanical Phenomena	en_US
dc.subject.mesh	Ultrasonography	en_US
dc.title	Passive mechanical properties of the gastrocnemius after spinal cord injury	en_US
dc.type	Journal Article
utslib.citation.volume	2	en_US
utslib.citation.volume	46	en_US
utslib.for	110317 Physiotherapy	en_US
utslib.for	11 Medical and Health Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Graduate School of Health
utslib.copyright.status	closed_access
pubs.issue	2	en_US
pubs.publication-status	Published	en_US
pubs.volume	46	en_US

Abstract:

Introduction: In this study we compared passive mechanical properties of gastrocnemius muscle-tendon units, muscle fascicles, and tendons in control subjects and people with ankle contractures after spinal cord injury. Methods:: Passive gastrocnemius length-tension curves were derived from passive ankle torque-angle data obtained from 20 spinal cord injured subjects with ankle contractures and 30 control subjects. Ultrasound images of muscle fascicles were used to partition length-tension curves into fascicular and tendinous components. Results:: Spinal cord injured subjects had stiffer gastrocnemius muscle-tendon units (stiffness index: 74.8 ± 27.0 m -1) than control subjects (54.4 ± 17.7 m -1) (P = 0.004). Muscle-tendon slack lengths, as well as slack lengths and changes in length of fascicles and tendons, were similar in the two groups. Conclusions:: People with ankle contractures after spinal cord injury have stiff gastrocnemius muscle-tendon units. It is not clear whether this reflects changes in properties of muscle fascicles or tendons. copy; 2012 Wiley Periodicals, Inc..

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http://hdl.handle.net/10453/43221