Characterization of spasticity in cerebral palsy: Dependence of catch angle on velocity

Yi Ning Wu, Yupeng Ren, Ashlee Goldsmith, Deborah J Gaebler-Spira, Shu Qian Liu, Li-Qun Zhang*

*Corresponding author for this work

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

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°, 180°, and 270° 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°/s) and under controlled terminal torque. Results: Compared with typically developing children, children with CP showed higher reflex-mediated torque (p<0.001) and the torque increased more rapidly with increasing velocity (p<0.001). Catch angle was dependent on velocity and occurred later with increasing velocity (p=0.005). Children with CP showed smaller ROM (p<0.05), greater stiffness (p<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.

Original languageEnglish (US)
Pages (from-to)563-569
Number of pages7
JournalDevelopmental Medicine and Child Neurology
Volume52
Issue number6
DOIs
StatePublished - Jun 1 2010

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Torque
Cerebral Palsy
Sensory Feedback
Hemiplegia
Articular Range of Motion
Joints
Quadriplegia
Aptitude
Elbow
Reflex

ASJC Scopus subject areas

  • Pediatrics, Perinatology, and Child Health
  • Developmental Neuroscience
  • Clinical Neurology

Cite this

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title = "Characterization of spasticity in cerebral palsy: Dependence of catch angle on velocity",
abstract = "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°, 180°, and 270° 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°/s) and under controlled terminal torque. Results: Compared with typically developing children, children with CP showed higher reflex-mediated torque (p<0.001) and the torque increased more rapidly with increasing velocity (p<0.001). Catch angle was dependent on velocity and occurred later with increasing velocity (p=0.005). Children with CP showed smaller ROM (p<0.05), greater stiffness (p<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.",
author = "Wu, {Yi Ning} and Yupeng Ren and Ashlee Goldsmith and Gaebler-Spira, {Deborah J} and Liu, {Shu Qian} and Li-Qun Zhang",
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Characterization of spasticity in cerebral palsy : Dependence of catch angle on velocity. / Wu, Yi Ning; Ren, Yupeng; Goldsmith, Ashlee; Gaebler-Spira, Deborah J; Liu, Shu Qian; Zhang, Li-Qun.

In: Developmental Medicine and Child Neurology, Vol. 52, No. 6, 01.06.2010, p. 563-569.

Research output: Contribution to journalArticle

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T2 - Dependence of catch angle on velocity

AU - Wu, Yi Ning

AU - Ren, Yupeng

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AU - Gaebler-Spira, Deborah J

AU - Liu, Shu Qian

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AB - 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°, 180°, and 270° 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°/s) and under controlled terminal torque. Results: Compared with typically developing children, children with CP showed higher reflex-mediated torque (p<0.001) and the torque increased more rapidly with increasing velocity (p<0.001). Catch angle was dependent on velocity and occurred later with increasing velocity (p=0.005). Children with CP showed smaller ROM (p<0.05), greater stiffness (p<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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