Heart
Your resting heart rate is a trend, not a number.
One of the simplest things a band can measure is also one of the most telling — as long as you read it over weeks, not mornings.
By Mana4 min read
A lower resting heart rate is broadly associated with better long-term outcomes — but the useful signal is your own trend over weeks, not any single reading.
What “resting” really means
Resting heart rate is how many times your heart beats in a minute when you’re still — not after the stairs, not mid-conversation, not with a coffee in hand. Because so much can nudge it, the reading is only as good as the moment it’s taken in.
That’s why we think the best time to measure it is the one you don’t have to think about: overnight, while you sleep. Taken the same way every night, the numbers become comparable with each other — which is what makes them useful.
Why it’s worth watching
In 2016, a meta-analysis in the Canadian Medical Association Journal pooled 46 prospective studies covering more than 1.2 million people. For every 10 beats per minute higher a person’s resting heart rate, the relative risk of death from any cause was 1.09 — about 9% higher — and 1.08 for cardiovascular death.
People resting above 80 beats per minute had a relative risk of 1.45 for all-cause mortality compared with the lowest category. These are associations across large populations, not a diagnosis for any one person — but they’re a good reason to keep an eye on the number.[1]
Resting HR · 8 weeks
56bpm
6 bpm from week 1
Read the trend, not the day
A single morning can mislead. A short night, a late meal, a drink or the start of a cold can lift your resting heart rate for a day or two, and that’s normal. Reacting to each reading turns a calm signal into noise.
What matters more is the direction over weeks. A slow drift down often follows steady training and good sleep; a rise that sticks around is worth noticing. Your own baseline is the only one that’s really comparable with you.
Where a band fits
Wrist-worn devices estimate heart rate optically, and researchers who study them stress that accuracy depends on the device, its algorithms and how it’s validated. A band is a way to see your trend effortlessly — not a medical test.
Mana is designed around that: it measures quietly through the night, compares each reading with your own recent baseline, and shows you the trend in the app. If your resting heart rate stays unusually high, or you have symptoms, talk to a doctor.[2]
References
The sources behind the figures in this article. Interpretation and advice are our own.
- 1Zhang D, Shen X, Qi X. Resting heart rate and all-cause and cardiovascular mortality in the general population: a meta-analysis. Canadian Medical Association Journal, 2016; 188(3): E53–E63. Read source
- 2de Zambotti M, Cellini N, Goldstone A, et al. Wearable Sleep Technology in Clinical and Research Settings. Medicine & Science in Sports & Exercise, 2019; 51(7): 1538–1557. Read source
General information, not medical advice. Mana is in development and isn’t intended to diagnose, treat or prevent any condition. If you’re concerned about your health, talk to a doctor.
