Association of fatal myocardial infarction with past level of physical activity: a pooled analysis of cohort studies

Abstract

Aims To assess the association between past level of physical activity (PA) and risk for death during the acute phase of myocardial infarction (MI) in a pooled analysis of cohort studies.

Methods and results European cohorts including participants with a baseline assessment of PA, conventional cardiovascular (CV) risk factors, and available follow-up on MI and death were eligible. Patients with an incident MI were included. Leisure-time PA was grouped as sedentary (<7 MET-hours), low (7–16 MET-hours), moderate (16.1–32 MET-hours), or high (>32 MET-hours) based on calculated net weekly energy expenditure. The main outcome measures were instant and 28-day case fatality of MI. Pooled odds ratios (ORs) with 95% confidence intervals (CIs) were calculated using multivariate random-effects models. Adjustments for age, sex, CV risk factors, alcohol consumption, and socioeconomic status were made. From 10 cohorts including a total of 1 495 254 participants, 28 140 patients with an incident MI comprised the study population. A total of 4976 (17.7%) died within 28 days—of these 3101 (62.3%) were classified as instant fatal MI. Compared with sedentary individuals, those with a higher level of PA had lower adjusted odds of instant fatal MI: low PA [OR, 0.79 (95% CI, 0.60–1.04)], moderate PA [0.67 (0.51–0.89)], and high PA [0.55 (0.40–0.76)]. Similar results were found for 28-day fatal MI: low PA [0.85 (0.71–1.03)], moderate PA [0.64 (0.51–0.80)], and high PA [0.72 (0.51–1.00)]. A low-to-moderate degree of heterogeneity was detected in the analysis of instant fatal MI (I2 = 47.3%), but not in that of 28-day fatal MI (I2 = 0.0%).

Conclusion A moderate-to-high level of PA was associated with a lower risk of instant and 28-day death in relation to a MI.