Dose-Response Relationship Between Physical Activity and Risk of Heart Failure: A Meta-Analysis.
Level 3 - non-randomized controlled study
Meta-analysis of non-randomized prospective cohort studies
PubMed 26438781 · doi:10.1161/CIRCULATIONAHA.115.015853
What was done
Authors conducted a meta-analysis of 12 prospective cohort studies (370,460 participants aged >18 years, 53.5% women, median follow-up 13 years, 20,203 incident heart failure events) evaluating the association between baseline physical activity and incident heart failure. Random-effects models evaluated categorical dose-response relationships, and generalized least-squares regression models assessed quantitative dose-response associations in MET-minutes per week.
What was found
Highest versus lowest physical activity levels were associated with a significant reduction in heart failure risk (pooled HR 0.70; 95% CI, 0.67–0.73). Compared with no leisure-time physical activity, guideline-recommended minimum activity (500 MET-min/wk) showed modest risk reduction (pooled HR 0.90; 95% CI, 0.87–0.92). Greater risk reductions occurred at twice the minimum guideline levels (1000 MET-min/wk; HR 0.81; 95% CI, 0.77–0.86) and 4 times the minimum levels (2000 MET-min/wk; HR 0.65; 95% CI, 0.58–0.73).
Why it matters
This quantitative synthesis confirms a graded dose-response relationship between physical activity and heart failure risk, suggesting that exceeding standard minimum physical activity targets yields substantially greater protection against heart failure.
Limits
The findings derive entirely from observational cohort studies subject to residual confounding and potential reverse causality. The abstract does not report heart failure subtypes (such as preserved versus reduced ejection fraction), objective versus self-reported activity measurements, or whether changes in physical activity during follow-up were accounted for.
Cited by
- supports The nadir where maximal cardiovascular benefit is achieved for heart failure outcomes is about 5 to 10 hours of exercise per week.