Introduction: Chronic obstructive pulmonary disease (COPD) is a major cause of chronic morbidity and mortality worldwide. COPD is characterized by persistent expiratory    flow limitation which is usually progressive. Dyspnea is the most prominent exercise-limiting symptom of the disease, which leads to chronic avoidance of physical activities.1 Inspiratory muscle training (IMT) has frequently been applied in patients with chronic obstructive pulmonary disease (COPD) to improve inspiratory muscle function, exertional dyspnea, and exercise tolerance. Results of the latest meta-analysis indicate that IMT as a stand-alone treatment yields clinically meaningful improvements in inspiratory muscle strength and endurance, functional exercise capacity, dyspnea, and quality of life.8 Aim of Study: “To Compare the Effectiveness of Inspiratory Muscle Training and Threshold device (IMT) in patients with Chronic Obstructive Pulmonary Disease” Methodology: This is a comparativestudy and study done in OPD and IPD of SMIH Patel Nagar, Dehradun (UK). A total of 30 subjects of either gender, diagnosed to have mild, moderate and severe COPD were included in thestudy and randomly divided into 2 groups 15 in each i.e. (Group A) Inspiratory muscle training and Threshold group (IMT) (group B). Limitation of Study: The study is conducted for a short duration and study shows only immediate effects and not the long term effects. Proper follow up is not done with the patients due to COVID-19 Pandemic. Total size of population group studied was small. In this study, the effects of extrinsic factors such as administration of drugs like Bronchodilators, Beta blockers, Corticosteroids, etc. and intakes of caffeine in the diet are not considered while including patients in the study. Future Research: Study can be done on largerpopulation. Further study can be done to check the combined effects of Inspiratoy muscle training and Threshold Devices. The exact mechanism behind the reduction of dyspnea following Inspiratory muscle training and the relationship between the reduction of dyspnea and Threshold Device can be studied in more detail. The duration of study can be increased. Conclusion: Analyzing and comparing both groups pre and post data, although both group shows significant differences with in the groups and between the groups but group A (Exercise Group) shows slightly more significant improvement in both outcome measures. Therefore, results suggest that after 4 week of Inspiratory muscle training and threshold device(IMT), both group shows improvement in Dyspnea but Inspiratory muscle training shows more improvement in Dyspnea in COPD patients.

Keywords: COPD, Dyspnoea, Inspiratory Muscle Training, Threshold device, forced expiratory volume, BDI/ TDI scale, mMRC.