The former aim of this study is to determine whether the arm swings change in patients with Chronic Obstructive Pulmonary Disease (COPD) according to healthy subjects. The latter purposes to investigate the correlation between balance parameters and arm swing, how to change arm swing according to severity of the disease, and to determine the relationship between balance and the severity of disease, the relationship of posture both arm swing and severity of disease in patients with COPD. In accordance with this purposes, 20 patients with COPD who have Global Initiative for Chronic Obstruction Lung Disease (GOLD) stage 1-2-3 and 20 healthy controls will be included between the ages of 40 and 65, respectively. Tests and questionnaires will be used in order to determine the severity of COPD and to evaluate posture. Berg Balance Scale, Time Up and Go Test, 6 Minute Pegboard and Ring Test, 6 Minute Walk Test and gait analysis will be performed. It is expected that by determining the parameters that can be affected by severity of COPD. It is estimate to have information about severity of the disease by means of observational analysis. It will guide professional working in the field.

Inclusion Criteria:

• Who has been clinically stable for the last 4 weeks,
• who will be able to walk independently for 6 minutes,
• According to the Classification of Airflow Limitation in COPD (GOLD) system, the Stage is 1-2-3,
• who declares that he has not taken part in any other research

Exclusion Criteria:

• walking assistive devices,
• receiving chronic oxygen therapy,
• with central and peripheral vestibular disease,
• with orthopedic, neuromuscular, neurological and cardiac diseases that may affect gait and balance,
• with a history of lung cancer, sarcoidosis, tuberculosis and/or lung surgery,
• who has communication problems,
• with mental and cognitive problems

Patients referred by the department of chest diseases of Hacettepe university will be taken.