Author/Authors :
Ghotbi, N Electrophysiology Laboratory - Faculty of Rehabilitation - Medical Sciences University of Tehran , Hadian, M. R Electrophysiology Laboratory - Faculty of Rehabilitation - Medical Sciences University of Tehran , Olyaei, G. R Electrophysiology Laboratory - Faculty of Rehabilitation - Medical Sciences University of Tehran , Bagheri, H Electrophysiology Laboratory - Faculty of Rehabilitation - Medical Sciences University of Tehran , Talebian, S Electrophysiology Laboratory - Faculty of Rehabilitation - Medical Sciences University of Tehran , Nakhostin-Ansari, N Electrophysiology Laboratory - Faculty of Rehabilitation - Medical Sciences University of Tehran , Nafissi, S Department of Neurology - School of Medicine - Medical Sciences University of Tehran
Abstract :
Despite the large body literature focused on the modified Ashworth Scale (MAS), validity
of the scale for measuring spasticity is still questionable. The purpose of this study was to investigate
the validity of the MAS by using both the conventional (Hmax/Mmax ratio) and the new indicators
(Hslp/Mslp) of motoneuron excitability. Main outcome measures were the MAS and electrophysiologic
assessments. The latter was performed using both conventional and new indicators of alpha motoneuron
excitability. Data on 20 hemiplegic patients (17 men and three women) were analyzed. Correlation
between the MAS and either soleus Hmax/Mmax or soleus Hslope/Mslope was not significant. In 10
patients whose H-reflex could be evoked bilaterally, only new spinal excitability indicator showed
significant difference between the affected and non-affected sides. Based on the results of this study,
there is no relationship between the MAS and the indicators of alpha motoneuron excitability. This
research suggests that the MAS is not a valid measure for the assessment of spasticity in ankle plantar flexors.
Keywords :
Stroke , Spasticity , Ashworth Scale , Hoffmann Reflex , Motoneuron excitability
