Effects of physical activity on cardiovascular outcomes and mortality in Korean patients with diabetes: a nationwide population-based cohort study

Background: Since a sedentary lifestyle is considered a modifiable risk factor for cardiovascular disease (CVD), physical activity (PA) is recommended for type 2 diabetes mellitus (T2DM) patients to prevent CVD. We investigated the association between different levels of PA and the risk for CVD and all-cause mortality in patients with T2DM using nationwide data. Methods: We examined health examination data and claims records of 2,745,637 participants with T2DM at baseline from the Korean National Health Insurance Service who underwent health examinations between 2009 and 2012. We excluded subjects with a history of myocardial infarction or stroke. Each participant was asked to report their weekly PA levels according to three categories: vigorous, moderate, and walking. The incidence of CVD and death was analyzed until 2017.Results: The risk of CVD was lower in regular exercisers than in nonexercisers after adjusting for confounding variables. A dose-response trend was evident in the association between the degree of PA and CVD risk. All categories of PA were inversely associated with CVD risk and mortality. The reduction in CVD risk and all-cause mortality was more profound in patients aged ≥65 years. Conclusions: Augmenting PA might have positive effects on the prevention of CVD and all-cause death, especially in the elderly. The benefits of PA were consistently observed in various subgroups regardless of the presence of chronic conditions. Therefore, clinicians should encourage elderly patients with T2DM to increase their daily PA.