Characterization of the mechanical and neural components of spastic hypertonia with modified H reflex

Cheng Ya Huang, Chun Hou Wang, Ing Shiou Hwang

研究成果: Article同行評審

29 引文 斯高帕斯(Scopus)

摘要

As the H reflex remains unable to assess mechanical changes intrinsic to a muscle, the aim of this study was to modify the H reflex techniques and to characterize the neural and mechanical components of muscle spasticity, relating the two components to clinical observations. Thirty-four patients featuring either a spinal-cord lesion (n = 15) or stroke (n = 19) and 23 neurologically normal subjects were recruited. Soleus H reflex and maximal M response (Mmax) were measured with electromyography and mechanomyography (MMG). The motoneuronal excitability was represented with the adjusted ratio of the H reflex to the Mmax (H/Mmax) and the ratio of the paired H reflexes (H2/H1). Muscle mechanical properties were characterized by the amplitude and median frequency of maximal M response recorded with MMG (MMGMmax). The results showed that spastic patients exhibited a larger H/Mmax, H2/H1 and amplitude of MMGMmax than the control group. H/Mmax and amplitude of MMGMmax accounted for 55.7% of the variance in the Modified Ashworth Scale, the clinical hypertonia assessment. The amplitude of MMGMmax correlated with functional impairments, as assessed with the Barthel index and Fugl-Meyer motor-assessment scale. It was concluded that spastic hypertonia involved an atypical increase in motoneuronal excitability and muscle mechanical properties, while impairment of functional performance and daily activity was attributable primarily to altered mechanical properties of a spastic muscle.

原文English
頁(從 - 到)384-391
頁數8
期刊Journal of Electromyography and Kinesiology
16
發行號4
DOIs
出版狀態Published - 2006 8月

All Science Journal Classification (ASJC) codes

  • 神經科學(雜項)
  • 生物物理學
  • 神經病學(臨床)

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