Chronic obstructive pulmonary disease (COPD) patients with mucus hyper secretion tend to demonstrate increased frequency of infective exacerbations and a steeper slope of decline in lung function. Enhanced mucosal clearance with high frequency chest wall oscillation (HFCWO) devices previously used in cystic fibrosis and bronchiectasis patients may offer the opportunity for community based, self-managed therapy to improve quality of life and lung function. The aim of this study is to compare effects of active cycle of breathing and high frequency chest wall oscillations in chronic obstructive pulmonary disease .This study will be a Randomized Clinical trial and will be conducted at Physical Therapy Department of DHQ Hospital NAROWAL. The study will be completed within the time duration of six months. Consecutive sampling technique will be used to collect the data. A sample size of Total 42 patients will be taken in this study. Patients will be divided into two groups. BODE Index will be used as outcome measurement tool. Group A will receive the Active cycle of breathing technique and it will performed twice a day for 4 week intervention period for 20 minutes. Group B will receive high frequency chest wall oscillations at 13-15Hz oscillating frequency for 20 minutes twice a day for 4 weeks. The collected data will be analyzed on SPSS - 25.

Inclusion Criteria:

• Patient with clear consciousness ,stable vital sign, and ability to cooperate
• Stage 3-4 COPD according to GOLD criteria
• Adult patients
• Patient who had given informed consent

Exclusion Criteria:

• Need for invasive mechanical ventilation
• Active lung tuberculosis
• Chest wall trauma
• Thoracic or abdominal operations in last three months.
• Presence of cardiac pacemaker, artificial stunt or heart failure