Abstract
Background: Rigidity is one of the cardinal symptoms in Parkinson's disease. Based on the findings of microneurography, Burke D et al. (1977) suggested that, in Parkinson patients, the spindle afferent responses look like those of normal subjects who are not fully relaxed and in whom there is a co-activation of the skeletomotor and fusimotor activity. In previous paper (J Physiol, 1998), we showed the existence of dynamic and static fusimotor actions on the human muscle spindle during voluntary contraction.
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