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

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Title Passive muscle mechanical properties of the medial gastrocnemius in young adults with spastic cerebral palsy
Author Barber, Lee Anthony; Barrett, Rod; Lichtwark, Glen
Journal Name Journal of Biomechanics
Year Published 2011
Place of publication United Kingdom
Publisher Elsevier
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.
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1016/j.jbiomech.2011.06.008
Volume 44
Issue Number 13
Page from 2496
Page to 2500
ISSN 0021-9290
Date Accessioned 2011-08-23
Date Available 2011-11-08T08:01:46Z
Language en_AU
Research Centre Centre for Musculoskeletal Research; Griffith Health Institute
Faculty Griffith Health Faculty
Subject Biomechanics
URI http://hdl.handle.net/10072/41440
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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