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NotificationsNotify me of updates to Impaired Coordination between Oscillatory Firing FF and FR-Type Motor Units in Parkinsonís Disease and Patients with Spinal Cord Injury, pp. 501-517
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Impaired Coordination between Oscillatory Firing FF and FR-Type Motor Units in Parkinsonís Disease and Patients with Spinal Cord Injury, pp. 501-517 $100.00
Authors:  Giselher Schalow
Abstract:
In a previous contribution it was shown that, in the rather physiologic functioning
human central nervous system (CNS), oscillatory firing motor units coordinate their
firing so as not to fire synchronously. In this paper I will show that, in spinal cord injury
and in Parkinsonís disease patients in whom coordination is impaired, some motor units
fire spontaneously oscillatory according to the muscle fibre type. Additionally, in
Parkinsonís disease patients numerous oscillatory firing motor units synchronized their
firing resulting in rhythmic muscle movement and shaking of body parts (tremor). Using
surface electromyography (sEMG) it can be shown that tremor in different muscles is
partly coordinated. Motor program bursts during coordinated low-load movements were
structured in Parkinsonís disease patients by rhythmic firing at ≈ 10Hz (firing frequency
of FF-type motor units) and 5Hz (frequency of oscillatory firing FR-type motor units and
frequency of tremor). In patients with partially injured spinal cord, motor bursts during
high-load exercising were structured with the oscillation frequencies of FR and FF-type
motor units and higher frequencies. Since α1 and α2-motoneurons which innervate FF and
FR-type muscle fibres respectively, were reported earlier to fire oscillatory in the isolated
spinal cord, in Parkinsonís disease patients rhythmic firing of motor units and tremor is
thought to primarily originate in the spinal cord rather than in the basal ganglia. 


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Impaired Coordination between Oscillatory Firing FF and FR-Type Motor Units in Parkinsonís Disease and Patients with Spinal Cord Injury, pp. 501-517