Abbreviations: FVC, forced vital capacity; % pred., percent predicted; FEV1, forced expiratory volume in 1 s; 6MWT, 6-min walk-test; CAT, COPD assessment test; Mmrc, Modified Medical British Research Council dyspnea questionnaire; BODE, BMI (B), airflow obstruction (O), dyspnea (D) and exercise capacity (E); BBS, Berg Balance Scale; SLS, Single Leg Stance; TUG, Timed Up and Go Test; 5STS, Five Repetition Sit to Stand Test; FSST, Four Step Square Test.