Dose Response of Incidental Physical Activity Against Cardiovascular Events and Mortality.
Level 3 - non-randomized controlled study
Prospective observational cohort study
PubMed 40228066 · doi:10.1161/CIRCULATIONAHA.124.072253
What was done
Researchers analyzed 24,139 self-reported non-exercisers (mean age 61.9 years, 56.2% women) from the 2013-2015 UK Biobank accelerometry substudy. Daily energy expenditure and durations of incidental physical activity (IPA) categorized as light (LIPA), moderate (MIPA), and vigorous (VIPA) were measured using a machine learning-based classifier. Incident major adverse cardiovascular events (MACE: stroke, myocardial infarction, heart failure, and CVD death), CVD mortality, and all-cause mortality were tracked over an average of 7.9 years.
What was found
Across follow-up, 908 MACE, 223 CVD deaths, and 1,071 all-cause deaths occurred. Total IPA volume had an L-shaped association reaching a plateau at 35 to 38 kJ/kg/day, corresponding to hazard ratios of 0.49 (95% CI, 0.39-0.61) for MACE, 0.33 (95% CI, 0.22-0.52) for CVD mortality, and 0.31 (95% CI, 0.25-0.38) for all-cause mortality. Protective associations plateaued at approximately 14 minutes per day for VIPA and 34 to 50 minutes per day for MIPA. Median durations of VIPA (4.6 minutes per day) and MIPA (23.8 minutes per day) were associated with CVD mortality hazard ratios of 0.62 (95% CI, 0.46-0.83) and 0.50 (95% CI, 0.31-0.80), respectively. LIPA was significantly associated with reduced CVD mortality only above 130 minutes per day. One minute of VIPA was health-equivalent to 2.8 to 3.4 minutes of MIPA and 34.7 to 48.5 minutes of LIPA.
Why it matters
This study establishes dose-response relationships for daily incidental activity, showing that accumulating even small amounts of moderate or vigorous daily movement outside structured exercise confers substantial cardiovascular and survival benefits.
Limits
As an observational cohort study, residual confounding and reverse causation cannot be fully ruled out. Physical activity was measured during a single baseline accelerometry window and may not capture long-term habit changes, and UK Biobank participants are known to be healthier than the general population.
Cited by
- supports According to the Stamatakis et al. study, light-intensity physical activity produced only minor risk reductions (5-10%) without significant benefit or strong dose-response for cardiovascular mortality, stroke, or heart attacks.