Rehabilitation sessions on treadmill will occur at Physical Medicine and Rehabilitation Regional Institute (IRR), on the University Hospital's site, three times per week during 4 weeks, and each will last 45 min. They will begin with 10 min of warm-up, then 30 min of walking, where intensity of effort can be modulated by speed and inclination of treadmill. Sessions will end cool-down during 5 min, which will be a reduction of intensity every 30 sec. Rehabilitation will be carried out by physiotherapist chosen for the study.

Conventional rehabilitation sessions will occur in private practices in which patients receive their habitual care (same physiotherapist). This care will be guided by prescription delivered by the neurologist. This prescription suggests to work on active and passive upper and lower limb stretching, on hip and shoulder dissociation, and balance control management on unstable ground.

Questionnaire score for NMS (non motor signs) in its globality.

Parkinson's Anxiety Scale, evaluating anxiety (between 0 and 30, a lower score being a better outcome).

King's Parkinson's Disease Pain Scale (KPPS, between 0 and 168, a lower score being a better outcome)

Visual Analogic Scale (VAS) (between 0 and 10, a lower score being a better score)

Corresponding to the mean path length travelled by displacement of the Centre of Foot Pressure in four conditions (eyes open or closed, firm or foamed support).

Corresponding to the mean ellipse area covered by displacement of the Centre of Foot Pressure in four conditions (eyes open or closed, firm or foamed support)

Ratio of sensory inputs in postural control (somatosensory, visual and vestibular ratios).

Entropy mathematically evaluates the displacements regularity of the Center of Foot Pressure (CoP). If the CoP displacements are regular (lower entropy), intentionally processes are more implicated in postural control regulation. If the CoP displacements are not regular (higher entropy), automatic processes are more implicated in postural control regulation. Entropy comparison between a single and a dual task is analyzed.

Timed Up and Go

Distance walked during the 6 min walk test

Mean velocity during the 6 min walk test.

Mean step high during the 6 min walk test.

Mean step length during the 6 min walk test.

Mean step width during the 6 min walk test.

Ratio of Perceived Exertion (RPE) score, evaluated by Borg Scale (according to the 6 min walk test). Score is between 6 and 20, 6 being a better outcome.