Modulation of the stretch reflex during volitional sinusoidal tracking in Parkinson's disease.

@article{Johnson1991ModulationOT,
  title={Modulation of the stretch reflex during volitional sinusoidal tracking in Parkinson's disease.},
  author={M. Vaughan Johnson and Andr{\'e} Kipnis and Myung Chul Lee and Rene Loewenson and Timothy J Ebner},
  journal={Brain : a journal of neurology},
  year={1991},
  volume={114 ( Pt 1B)},
  pages={443-60}
}
Sinusoidal visually-guided wrist tracking, in normal and parkinsonian subjects, was perturbed by torque transients every 90 degrees throughout the movement. Long-latency stretch reflex and volitional EMG amplitude modulations were assessed as functions of the tracking phase. Reflex modulation during tracking, both in wrist flexor and extensor muscles, was found to differ significantly between parkinsonian and normal subjects. In the parkinsonian group, the abnormality consisted of an increased… CONTINUE READING

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