Plainly written health guides, with the evidence graded
8 guides
Edited by Dev Petrossian, contributor, heart and circulation.
The cuff itself is rarely the problem. Posture, arm position, timing and the ten minutes before you sit down account for most of the gap between what you read at home and what a clinician would actually trust.
Strong evidence18 Sept 2026
A number that would trigger an alarm on a hospital monitor is unremarkable in a marathon runner's chart. The rate alone can't tell you which case you are — a short list of accompanying details usually can.
Strong evidence18 Sept 2026
The chart hasn't drawn a different line for age since the guideline last moved, in 2025. What changed that year was which of two identical-looking readings gets treated — and age had almost nothing to do with it.
Strong evidence18 Sept 2026
Search 'VO2 max chart' and the number for the same age and sex can differ by ten points depending which chart you land on — because a lab gas-exchange test, a submaximal prediction and a wearable's algorithm are three different measurements wearing the same name.
Moderate evidence18 Sept 2026
Wearables now hand out a heart-rate-variability score most mornings, styled like a vital sign with one correct answer. The score is real. Whether it means what the app implies, and whether it means the same thing two mornings running, is a narrower question worth separating out.
Moderate evidence18 Sept 2026
Sixty to a hundred beats a minute is the range every clinician quotes, and it hasn't changed in decades — but it was never built to answer whether your particular 54 or 103 is something to watch.
Strong evidence18 Sept 2026
A cuff that reads 150/95 in the exam room and 118/76 on your own sofa an hour later has not measured two different blood pressures. It has caught the same one on a day when only half the readings included the stress of being measured.
Moderate evidence18 Sept 2026
Cutting sodium lowers blood pressure less for some people than others, and the gap is not willpower or taste. It is a measurable trait tied to age, weight, kidney function and race — with an honest answer for why the guidance still applies broadly anyway.
Moderate evidence18 Sept 2026