Hormonal
For very short bouts of physical activity (less than 1 minute), a minimum proportion of vigorous intensity (at least 12-15%) is required to significantly reduce the risk of Major Adverse Cardiovascular Events (MACE), though all-cause mortality benefits may appear at lower vigorous thresholds.
If you can only manage very short bursts of activity (under a minute), make sure they include some vigorous effort, like running up stairs quickly or walking very fast. This high-intensity component is crucial for protecting your heart when the duration is minimal.
Short bouts (<1 min) were associated with lower MACE risk only when bouts were comprised of at least 15% vigorous activity. MV-ILPA bouts of less than 1 min were associated with lower risk of all-cause mortality when at least 12% of the MV-ILPA duration was comprised of vigorous intensity physical activity.
Why this rating
Same high-quality cohort data, but this is a subgroup/interaction finding.
Source
Brief bouts of device-measured intermittent lifestyle physical activity and its association with major adverse cardiovascular events and mortality in people who do not exercise: a prospective cohort study
Matthew Ahmadi et al. · The Lancet Public Health · 2023
DOI 10.1016/s2468-2667(23)00183-4
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