Progress and Prospects in Parkinson's Research/Symptoms/Cogwheel rigidity

( To subpage for editing >> ) 

Cogwheel rigidity
Stiffness in the muscles, with a jerky quality when arms and legs are repeatedly moved.

The following references are relevant:-

Lance et al(1963) Action tremor and the cogwheel phenomenon in Parkinson’s disease

Findley et al (1981) Tremor, the cogwheel phenomenon and clonus in Parkinson’s disease 

Ghiglione et al(2005)  Cogwheel Rigidity