Lower respiratory tract infections are one of the main hospitalization or mortality cause in idiopathic Parkinson's disease. Because of akinesia and articular rigidity these patient develop restrictive syndrome by reduction in the thoraco-lung compliance.The consequence is a progressive loss of the aerobic physical abilities and infection.

The myotensive technique of active muscular stretching seem to increase the range of motion in healthy subject but also in patient with chronic bronchiotisis . These technics also increase the vital respiratory capacity and re enforce the muscles.So adding these technics during the period when the Parkinson's disease patient is stable would be a way of improvement .

To validate if these techniques really improve the the vital respiratory capacity, investigators randomize patient in 2 groups; one will have the standard protocol of stretching + self stretching of the same muscles (experimental group) and the other one (control group) will have the standard protocol and self stretching of forearm . Self stretching of forearm is selected to avoid bias .

Inclusion Criteria:

• Age >18
• with Parkinson's disease
• stable stade of pathology
• without any treatment modification.

Exclusion Criteria:

• rehabilitation support or osteopathic support
• active smoking
• respiratory disease
• cognitives trouble
• any other neurologic pathology