A new study finds that increasing the proportion of vigorous activity in total activity is linked to substantially lower risks across eight disease categories and mortality, with those engaging in more than 4% vigorous activity seeing 29%–63% lower risks for diseases and a 46% lower mortality risk versus no vigorous activity.

The research analyzed seven days of wrist-worn accelerometer data from about 62-year-olds and tracked outcomes over roughly 9 to 15 years, examining major adverse cardiovascular events, atrial fibrillation, type 2 diabetes, immune-mediated inflammatory diseases, chronic respiratory disease, metabolic-associated steatotic liver disease, chronic kidney disease, and dementia.

In a UK Biobank analysis including 96,408 device-measured and 375,730 self-reported adults, higher vigorous-intensity activity generally reduced disease risk more than higher total activity across most conditions.

Limitations include potential residual confounding, self-reporting errors, only a short 7-day activity snapshot, and a predominantly White cohort with a low response rate.

Current US guidelines call for 75 minutes of vigorous activity or 150 minutes of moderate activity weekly; the findings suggest meaningful benefits from short, high-intensity bursts even when weekly total time is small.

The study was led by Jiehua Wei of Xiangya School of Public Health and published online March 29 in the European Heart Journal, with disclosures noting funding sources and a consultant relationship for one author.

For many outcomes, benefits rise with more vigorous activity but level off around 4%–5% of total activity for some conditions, based on device data.

Overall conclusion: increasing the share of vigorous activity, when feasible, may offer greater preventive benefits for a range of chronic diseases and mortality, highlighting the value of short, high-intensity exercise in public health guidance.

The study distinguishes intensity from volume, showing that some diseases (like immune-mediated inflammatory diseases) are more strongly influenced by intensity, while others show mixed effects of intensity and volume.

Both higher intensity and higher total activity were associated with reduced risks for metabolic conditions and mortality.