Background: Parkinson disease (PD) is a progressive neurodegenerative disorder and characterized by tremor, rigidity and bradykinesia. Almost 84% of PD patient develops respiratory abnormalities and pointed as the most common cause of death. Airway obstruction, trunk muscle rigidity is the common cause of respiratory abnormalities.

Purpose: The main purpose of the study will evaluate the efficacy of chest PNF on pulmonary function and chest wall mobility in PD.

Methods: 20 participants will be recruited for study purpose and divide into two groups. Group= A will be the control group and participants will receive conventional treatment which includes deep breathing exercise and segmental breathing exercise, incentive spirometry etc for one week. Group= B participants will receive chest PNF exercise along with conventional treatment for a week. Pretreatment and post-treatment data will be recorded by the help of PFT (FVC, FEV1 & FEV1/FVC) and chest wall expansion at axillary and xiphisternal level for data analysis. Data analysis will be done by paired t-test for within group and independent t-test will be used for the between-group variable. The level of significance will be set at 0.05.

Inclusion Criteria:

1. Grade 3 to grade 5 Parkinson patients according to Hoehn Yahar scale
2. MMSE score >23.
3. Age 50-70 yrs.
4. Both Male and Female.

Exclusion Criteria:

1. Previous history of cardiac and pulmonary surgery.
2. History of flail chest.
3. Individual affected by neurological disorder other than PD.
4. Uncooperative patients.
5. Individual with the psychosomatic disorder.