Does exercise need to happen every day?
Two different weekly activity patterns were associated with lower heart-attack risk in a large observational study.
The 30-second takeaway
People who concentrated much of their activity into one or two days had lower heart-attack risk than less active people. So did people who spread activity out. This supports some flexibility in how an active week can look, but it does not prove the schedules are interchangeable or that activity caused the difference.
Active and less active participants differed in other ways. One tracking week cannot represent every season or establish causation.
What researchers found
Heart-attack hazard ratios
1 means no difference in the modeled heart-attack rate; below 1 means lower. Concentrated / spread-out activity, each versus less active participants. Not absolute-risk reductions.
What counted as concentrated
Both active groups accumulated at least 150 weekly minutes. The concentrated group did at least half in one or two days; these need not be weekends.
What the comparison suggests
Both patterns were associated with fewer cardiovascular events. The study measured habits rather than assigning exercise schedules.
The original publication
Accelerometer-Derived "Weekend Warrior" Physical Activity and Incident Cardiovascular Disease
Shaan Khurshid et al.
JAMA · 2023
- PubMed ID
- 37462704
- Record checked
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