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ERIC Number: EJ885682
Record Type: Journal
Publication Date: 2010-Jun
Pages: 7
Abstractor: As Provided
Reference Count: 0
ISSN: ISSN-0012-1622
Characterization of Spasticity in Cerebral Palsy: Dependence of Catch Angle on Velocity
Wu, Yi-Ning; Ren, Yupeng; Goldsmith, Ashlee; Gaebler, Deborah; Liu, Shu Q.; Zhang, Li-Qun
Developmental Medicine & Child Neurology, v52 n6 p563-569 Jun 2010
Aim: To evaluate spasticity under controlled velocities and torques in children with cerebral palsy (CP) using a manual spasticity evaluator. Method: The study involved 10 children with spastic CP (six males, four females; mean age 10y 1mo, SD 2y 9mo, range 7-16y; one with quadriplegia, six with right hemiplegia, three with left hemiplegia; Gross Motor Function Classification System levels I [n = 2], II [n = 3], III [n = 2], IV [n = 2], and V [n = 1]; Manual Ability Classification System levels II [n = 5], III [n = 4], and V [n = 1]) and 10 typically developing participants (four males, six females; mean age 10y 3mo, SD 2y 7mo, range 7-15y). Spasticity and catch angle were evaluated using joint position, resistance torque, and torque rate at velocities of 90 degrees, 180 degrees, and 270 degrees per second, controlled using real-time audio-visual feedback. Biomechanically, elbow range of motion (ROM), stiffness, and energy loss were determined during slow movement (30 degrees/s) and under controlled terminal torque. Results: Compared with typically developing children, children with CP showed higher reflex-mediated torque (p less than 0.001) and the torque increased more rapidly with increasing velocity (p less than 0.001). Catch angle was dependent on velocity and occurred later with increasing velocity (p = 0.005). Children with CP showed smaller ROM (p less than 0.05), greater stiffness (p less than 0.001), and more energy loss (p = 0.003). Interpretation: Spasticity with velocity dependence may also be position-dependent. The delayed catch angle at higher velocities indicates that the greater resistance felt by the examiner at higher velocities was also due to position change, because the joint was moved further to a stiffer position at higher velocities.
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Publication Type: Journal Articles; Reports - Research
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A