Progress and Prospects in Parkinson's Research/Symptoms/Gegenhalten

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Gegenhalten
Involuntary variable resistance during passive movement

The following references are relevant:-

Bahram et al (2009)  Exercise therapy, quality of life, and activities of daily living in patients with Parkinson disease: a small scale quasi-randomised trial 

Franzen et al (2009)   Reduced Performance in Balance, Walking and Turning Tasks is Associated with Increased Neck Tone in Parkinson's Disease 

Xia et al (2011)  Differentiation between the contributions of shortening reaction and stretch-induced inhibition to rigidity in Parkinson’s disease