Passive mechanical properties of gastrocnemius muscles of people with ankle contracture after stroke

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

Passive mechanical properties of gastrocnemius muscles of people with ankle contracture after stroke

Kwah, LK

Herbert, RD Harvey, LA Diong, J Clarke, JL Martin, JH Clarke, EC Hoang, PD Bilston, LE Gandevia, SC

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Publication Type:: Journal Article
Citation:: Archives of Physical Medicine and Rehabilitation, 2012, 93 (7), pp. 1185 - 1190
Issue Date:: 2012-01-01

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Field	Value	Language
dc.contributor.author	Kwah, LK https://orcid.org/0000-0002-9809-9859	en_US
dc.contributor.author	Herbert, RD	en_US
dc.contributor.author	Harvey, LA	en_US
dc.contributor.author	Diong, J	en_US
dc.contributor.author	Clarke, JL	en_US
dc.contributor.author	Martin, JH	en_US
dc.contributor.author	Clarke, EC	en_US
dc.contributor.author	Hoang, PD	en_US
dc.contributor.author	Bilston, LE	en_US
dc.contributor.author	Gandevia, SC	en_US
dc.date.available	2012-02-13	en_US
dc.date.issued	2012-01-01	en_US
dc.identifier.citation	Archives of Physical Medicine and Rehabilitation, 2012, 93 (7), pp. 1185 - 1190	en_US
dc.identifier.issn	0003-9993	en_US
dc.identifier.uri	http://hdl.handle.net/10453/43222
dc.description.abstract	Objective: To investigate the mechanisms of contracture after stroke by comparing passive mechanical properties of gastrocnemius muscle-tendon units, muscle fascicles, and tendons in people with ankle contracture after stroke with control participants. Design: Cross-sectional study. Setting: Laboratory in a research institution. Participants: A convenience sample of people with ankle contracture after stroke (n=20) and able-bodied control subjects (n=30). Interventions: Not applicable. Main Outcome Measures: Stiffness and lengths of gastrocnemius muscle-tendon units, lengths of muscle fascicles, and tendons at specific tensions. Results: At a tension of 100N, the gastrocnemius muscle-tendon unit was significantly shorter in participants with stroke (mean, 436mm) than in able-bodied control participants (mean, 444mm; difference, 8mm; 95% confidence interval [CI], 0.2-15mm; P=.04). Muscle fascicles were also shorter in the stroke group (mean, 44mm) than in the control group (mean, 50mm; difference, 6mm; 95% CI, 1-12mm; P=.03). There were no significant differences between groups in the mean stiffness or length of the muscle-tendon units and fascicles at low tension, or in the mean length of the tendons at any tension. Conclusions: People with ankle contracture after stroke have shorter gastrocnemius muscle-tendon units and muscle fascicles than control participants at high tension. This difference is not apparent at low tension. © 2012 American Congress of Rehabilitation Medicine.	en_US
dc.relation.ispartof	Archives of Physical Medicine and Rehabilitation	en_US
dc.relation.isbasedon	10.1016/j.apmr.2012.02.009	en_US
dc.subject.classification	Rehabilitation	en_US
dc.subject.mesh	Muscle, Skeletal	en_US
dc.subject.mesh	Ankle Joint	en_US
dc.subject.mesh	Humans	en_US
dc.subject.mesh	Contracture	en_US
dc.subject.mesh	Ultrasonography, Doppler	en_US
dc.subject.mesh	Severity of Illness Index	en_US
dc.subject.mesh	Likelihood Functions	en_US
dc.subject.mesh	Linear Models	en_US
dc.subject.mesh	Follow-Up Studies	en_US
dc.subject.mesh	Cross-Sectional Studies	en_US
dc.subject.mesh	Muscle Contraction	en_US
dc.subject.mesh	Torque	en_US
dc.subject.mesh	Aged	en_US
dc.subject.mesh	Aged, 80 and over	en_US
dc.subject.mesh	Biomechanical Phenomena	en_US
dc.subject.mesh	Female	en_US
dc.subject.mesh	Male	en_US
dc.subject.mesh	Middle Aged	en_US
dc.subject.mesh	Muscle Fibers, Skeletal	en_US
dc.subject.mesh	Reference Values	en_US
dc.subject.mesh	Stress, Mechanical	en_US
dc.subject.mesh	Stroke	en_US
dc.subject.mesh	Stroke Rehabilitation	en_US
dc.title	Passive mechanical properties of gastrocnemius muscles of people with ankle contracture after stroke	en_US
dc.type	Journal Article
utslib.citation.volume	7	en_US
utslib.citation.volume	93	en_US
utslib.for	1103 Clinical Sciences	en_US
utslib.for	1117 Public Health and Health Services	en_US
utslib.for	1106 Human Movement and Sports 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	7	en_US
pubs.publication-status	Published	en_US
pubs.volume	93	en_US

Abstract:

Objective: To investigate the mechanisms of contracture after stroke by comparing passive mechanical properties of gastrocnemius muscle-tendon units, muscle fascicles, and tendons in people with ankle contracture after stroke with control participants. Design: Cross-sectional study. Setting: Laboratory in a research institution. Participants: A convenience sample of people with ankle contracture after stroke (n=20) and able-bodied control subjects (n=30). Interventions: Not applicable. Main Outcome Measures: Stiffness and lengths of gastrocnemius muscle-tendon units, lengths of muscle fascicles, and tendons at specific tensions. Results: At a tension of 100N, the gastrocnemius muscle-tendon unit was significantly shorter in participants with stroke (mean, 436mm) than in able-bodied control participants (mean, 444mm; difference, 8mm; 95% confidence interval [CI], 0.2-15mm; P=.04). Muscle fascicles were also shorter in the stroke group (mean, 44mm) than in the control group (mean, 50mm; difference, 6mm; 95% CI, 1-12mm; P=.03). There were no significant differences between groups in the mean stiffness or length of the muscle-tendon units and fascicles at low tension, or in the mean length of the tendons at any tension. Conclusions: People with ankle contracture after stroke have shorter gastrocnemius muscle-tendon units and muscle fascicles than control participants at high tension. This difference is not apparent at low tension. © 2012 American Congress of Rehabilitation Medicine.

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http://hdl.handle.net/10453/43222