Passive muscle mechanical properties of the medial gastrocnemius in young adults with spastic cerebral palsy

Barber, Lee, Barrett, Rod and Lichtwark, Glen (2011) Passive muscle mechanical properties of the medial gastrocnemius in young adults with spastic cerebral palsy. Journal of Biomechanics, 44 13: 2496-2500. doi:10.1016/j.jbiomech.2011.06.008


Author Barber, Lee
Barrett, Rod
Lichtwark, Glen
Title Passive muscle mechanical properties of the medial gastrocnemius in young adults with spastic cerebral palsy
Journal name Journal of Biomechanics   Check publisher's open access policy
ISSN 0021-9290
1873-2380
Publication date 2011-09-01
Year available 2011
Sub-type Article (original research)
DOI 10.1016/j.jbiomech.2011.06.008
Open Access Status Not Open Access
Volume 44
Issue 13
Start page 2496
End page 2500
Total pages 5
Place of publication Kidlington, Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 1304 Biophysics
2732 Orthopedics and Sports Medicine
2204 Biomedical Engineering
2742 Rehabilitation
Abstract Individuals with spastic cerebral palsy (SCP) exhibit restricted joint range of motion and increased joint stiffness due to structural alterations of their muscles. Little is known about which muscle–tendon structures are responsible for these alterations. The aim of this study was to compare the passive mechanics of the ankle joint and medial gastrocnemius (MG) muscle in young adults with SCP and typically developed (TD) individuals. Nine ambulant SCP (17±2 years) and ten TD individuals (18±2 years) participated in the study. Physiological cross sectional area was estimated using freehand 3D ultrasound and found to be 37% lower in the SCP group. An isokinetic dynamometer rotated the ankle through its range while joint torque and ultrasound images of the MG muscle fascicles were simultaneously measured. Mean ankle stiffness was found to be 51% higher and mean MG fascicle strain 47% lower in the SCP group. Increased resistance to passive ankle dorsiflexion in SCP appears to be related to the inability of MG muscle fascicles to elongate with increased force.
Keyword Contracture
Spasticity
Stiffness
Fascicle
Q-Index Code C1
Q-Index Status Confirmed Code
Grant ID 481953
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2012 Collection
School of Human Movement and Nutrition Sciences Publications
 
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