Sensory Stimulation Effect on Movement Speed in Patients With Parkinson Disease

Movement slowness (bradykinesia) is one of the main motor symptoms in Parkinson Disease (PD). Several studies have shown that patients with PD exhibit slowness because they are unable to modulate, in an optimal way, the velocity of voluntary motor acts not induced by external stimulation. Indeed, these patients have difficulties to integrate multi-sensorial information, mainly proprioception. The investigators investigated changes in shoulder velocity during pointing movements by patients with PD after stimulation of soft tissues (aponeurosis) of upper limb muscles. The stimulation consisted of manipulating, with a hook (the diacutaneous fibrolysis method), the aponeurotic tissues enrobing the heads of the upper limb muscles. This technique has previously been shown to decrease passive tension and the tendon reflex response of the manipulated muscle group. The investigators hypothesis is that aponeurotic manipulation of shoulder muscles therefore creates a modification in the proprioceptive information, which in return temporarily decreases the bradykinesia of shoulder movements.