By Bhagwan T. Shahani
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Additional info for Electromyography in CNS Disorders. Central EMG
Neurosurg. Psychiatry 37(8):927-937. -J. 1973. Discharge characteristics of single motor units in normal subjects and patients with supraspinal motor disturbances. In New developments in electromyography and clinical neurophysiology, vol. 3, ed. J. E. Desmedt. Basel: S. Karger, pp. 242-250. ; and Homberg, V. In press. The muscle activity pattern (MAS): a method monitoring motoneurone pool action. ; and Dietz, V. 1975. Activity of single motor units from human forearm muscles during voluntary isometric contractions.
The compensatory increase of motor unit firing rates has also been observed in patients suffering from neuropathies. In these cases the higher firing rates could compensate for the decrease in the number of motor units that can be recruited. The M A S seem to provide a method for assessment of certain aspects of the activity of a motoneuron pool. Changes in the net force output are displayed as well as synchronization between motor units. In addition, M A S provide semiquantitative information about the proportion of motor units firing at various rates.
For this reason, a diagnostic approach holding so much potential information about characteristic changes in pathologic conditions—including central motor disorders—is barely applied. 38 ELECTROMYOGRAPHY I N C N S D I S O R D E R S : CENTRAL E M G THE ACTIVITY O F A M O T O N E U R O N P O O L A N D THE MUSCLE ACTIVITY SPECTRUM The search for a method suitable to monitor the activity of many motor units and of the motoneuron pool itself led to the consideration of a number of techniques that could be useful in that respect.
Electromyography in CNS Disorders. Central EMG by Bhagwan T. Shahani