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

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Hypertonia
Excessive muscle tone

The followng references are relevant:-

Wright et al (2007)  Axial hypertonicity in Parkinson’s disease: Direct measurements of trunk and hip torque 

Goldenberg(2008) Medical Management of Parkinson’s Disease

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

Further Research
References