A physiological mechanism of bradykinesia.

  title={A physiological mechanism of bradykinesia.},
  author={Mark Hallett and Shahram Khoshbin},
  journal={Brain : a journal of neurology},
  volume={103 2},
Patients with Parkinson's disease were asked to make ballistic elbow flexion movements of 10, 20 and 40 degrees. Normal subjects made all these movements in the same amount of time with a single 'triphasic' EMG pattern of successive bursts in biceps, triceps and biceps. Almost all the patients made some movements requiring additional cycles of alternating biceps and triceps activity. Most of the patients exhibited at least one example of a longer movement taking more cycles than a shorter… CONTINUE READING
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