Bryan Johnson· Author
Wearing a facemask during a walk in highly polluted air was associated with lower blood pressure, and increased heart rate variability (a good marker for relaxation and heart health) (11).
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
Wearing a facemask during a walk in highly polluted air was associated with lower blood pressure, and increased heart rate variability (a good marker for relaxation and heart health) (11).
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