Quantitative analysis of the velocity related pathophysiology of spasticity and rigidity in the elbow flexors

H. M. Lee, Y. Z. Huang, Jia Jin J. Chen, I. S. Hwang

研究成果: Article同行評審

92 引文 斯高帕斯(Scopus)

摘要

Objective: To quantify velocity dependent and position related properties of increased muscle tone measured during a constant velocity stretch. Methods: Elbow flexors were vertically stretched under four different velocities (40, 80, 120, and 160°/s) through a 75° range of motion in 12 patients with hemiparesis, 16 with parkinsonism, and 12 normal controls. From reactive torque measurement, a linear second order model was adopted to dissociate velocity dependent viscous and velocity independent elastic components. The averaged speed dependent reflex torque (ASRT) - defined as the deviation of measured torque from baseline torque - was used to quantify the viscous component of hypertonia. Velocity sensitivity of ASRT (VASRT) and segmented ASRT (SASRT), derived from the slope of the regression line among ASRT velocity plots and from segmentations of reactive torque, respectively, were used to differentiate the increased muscle tone of spasticity and rigidity. Results: ASRT and VASRT were significantly higher in both spasticity and rigidity than in normal controls. SASRT analysis showed three different position related patterns among spasticity, rigidity, and normal groups: spasticity showed progressively increasing muscle tension relative to position; rigidity showed increased (relative to the norm) but constant muscle tone over the entire stretch range; the normal control group showed a consistently low reactive torque over the entire range. Conclusions: Velocity dependence analysis indicates that rigidity and spasticity have approximately equal velocity dependent properties. For differentiating these two types of hypertonia, position dependent properties my be employed.

原文English
頁(從 - 到)621-629
頁數9
期刊Journal of Neurology Neurosurgery and Psychiatry
72
發行號5
DOIs
出版狀態Published - 2002

All Science Journal Classification (ASJC) codes

  • 手術
  • 神經病學(臨床)
  • 精神病學和心理健康

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