APOB and chronic obstructive pulmonary disease: Considering the extensive researches on identifying the factors affecting the development and progression of COPD, and the need for new methods for the better management of this disease and its associated disorders, which cardiovascular diseases are of the most important ones, the current study aimed at determining the effect of aerobic exercises on the serum levels of Apo A1 and Apo B, their ratio, and their roles in improving lung efficacy and reducing the risk of cardiovascular diseases in patients with COPD.