Key findings
- Normal adult resting heart rate is 60–100 bpm; well-conditioned athletes can sit nearer 40 bpm. (American Heart Association; Mayo Clinic)
- In 92,457 adults wearing a fitness tracker, mean resting heart rate was about 65 bpm, and individual values ranged from 40 to 109 bpm — a spread of nearly 70 bpm between healthy people. (Quer et al., PLOS ONE, 2020)
- Standing up alone typically adds about 10–15 bpm. A sustained rise of 30 bpm or more within ten minutes of standing is the clinical threshold used to define postural tachycardia syndrome in adults. (Heart Rhythm Society consensus statement, 2015)
- Laboratory public-speaking stress raises heart rate by roughly 15–25 bpm above resting baseline in the standard Trier Social Stress Test protocol. (Kirschbaum et al., 1993, and subsequent TSST literature)
- Maximum heart rate is estimated at 220 minus age (the common rule) or 208 minus 0.7 × age (Tanaka et al., Journal of the American College of Cardiology, 2001). Moderate exercise is 50–70% of that maximum; vigorous is 70–85%. (AHA)
- Apple Watch had the lowest heart rate error of seven wrist devices tested, with a median error of about 2%; energy-expenditure estimates on the same devices were off by 27–93%. (Shcherbina et al., Stanford, Journal of Personalized Medicine, 2017)
- Wrist optical sensors agree closely with ECG at rest and less well during exercise: Apple Watch concordance with ECG was 0.91 overall versus 0.99 for a chest strap. (Wang et al., Cleveland Clinic, JAMA Cardiology, 2017)
- In the 419,297-person Apple Heart Study, 0.52% of participants received an irregular-pulse notification; the positive predictive value of an individual notification was 0.84. (Perez et al., New England Journal of Medicine, 2019)
- Each 10 bpm increase in resting heart rate was associated with about a 9% higher all-cause mortality risk across 46 studies and more than a million participants. (Zhang et al., CMAJ, 2016)
- Apple Watch’s default high heart rate alert fires at 120 bpm and its low alert at 40 bpm, in each case only after the rate has held there for ten minutes of inactivity. (Apple Support)
Resting heart rate: reference ranges
| Population | Resting heart rate | Source |
|---|---|---|
| Healthy adults (guideline range) | 60–100 bpm | American Heart Association |
| Well-trained athletes | Can approach 40 bpm | Mayo Clinic |
| 92,457 tracker-wearing adults, mean | ≈65 bpm | Quer et al., 2020 |
| Same cohort, range across individuals | 40–109 bpm | Quer et al., 2020 |
Population figures describe the spread between people. Your own baseline is a narrower band inside that spread, which is why a change against your own history is more informative than where you sit in the table.
Heart rate by activity type
Where a calendar is involved, the useful comparison is not against the population but against your own resting level. These are the expected shifts, in order of how easily they explain an elevated reading:
| Situation | Typical change from resting | Source |
|---|---|---|
| Sleeping | Below daytime resting; lowest usually in the first half of the night | See the sleep guide |
| Seated, at rest | Baseline (60–100 bpm in adults) | AHA |
| Standing up | +10–15 bpm within minutes; ≥30 bpm sustained is the adult POTS criterion | Sheldon et al., 2015 |
| Public-speaking stress test (TSST) | ≈+15–25 bpm during the task | Kirschbaum et al., 1993 |
| Moderate exercise (brisk walk, easy cycle) | 50–70% of maximum heart rate | AHA |
| Vigorous exercise (running, hard intervals) | 70–85% of maximum heart rate | AHA |
A one-hour meeting sits in the “seated” row unless you stood, walked in, or spoke a lot. Those three account for most of the elevation people attribute to stress.
Maximum heart rate and exercise bands by age
Two formulas are in common use. The AHA chart uses 220 − age. Tanaka and colleagues found 208 − 0.7 × age fit measured data better across the adult range; the two agree at 40 and diverge either side. The zone columns use the AHA formula.
| Age | 220 − age | 208 − 0.7 × age | Moderate (50–70%) | Vigorous (70–85%) |
|---|---|---|---|---|
| 20 | 200 bpm | 194 bpm | 100–140 bpm | 140–170 bpm |
| 30 | 190 bpm | 187 bpm | 95–133 bpm | 133–162 bpm |
| 40 | 180 bpm | 180 bpm | 90–126 bpm | 126–153 bpm |
| 50 | 170 bpm | 173 bpm | 85–119 bpm | 119–145 bpm |
| 60 | 160 bpm | 166 bpm | 80–112 bpm | 112–136 bpm |
| 70 | 150 bpm | 159 bpm | 75–105 bpm | 105–128 bpm |
Computed from the published formulas; rounded to the nearest whole beat. Both are population estimates with a standard deviation of roughly 10 bpm, so an individual’s true maximum can differ from either.
How accurate is a wrist sensor?
Apple Watch and most fitness trackers measure heart rate by photoplethysmography: green LEDs and photodiodes reading blood-flow changes at the wrist. The published accuracy figures matter because they bound what a day chart can and cannot tell you.
- Shcherbina et al., 2017 (Stanford). Seven devices, 60 volunteers, sitting, walking, running and cycling against ECG. Apple Watch had the lowest heart rate error (median about 2%); no device’s energy-expenditure estimate came within 20% of the reference.
- Wang et al., 2017 (Cleveland Clinic). 50 adults on a treadmill against ECG. Chest strap concordance 0.99; Apple Watch 0.91; the other wrist devices lower. Accuracy on every wrist device fell as intensity rose.
- Perez et al., 2019 (Apple Heart Study). 419,297 participants over a median of 117 days. 0.52% received an irregular-pulse notification; among those who then wore an ECG patch, atrial fibrillation was confirmed in 34%; the positive predictive value of a single notification was 0.84.
The practical reading: at rest and during ordinary desk work, a wrist reading is close enough that a shift of 15 bpm against your baseline is real. During a run, the same sensor is best treated as a trend, not a measurement.
Apple Watch sampling and alert thresholds
- Apple Watch takes background heart rate readings periodically throughout the day when you are still, and records continuously during workouts. Those samples are what Apple Health stores and what a calendar-context app displays.
- The high heart rate notification defaults to 120 bpm and the low notification to 40 bpm; both trigger only if the rate stays past the threshold for ten minutes while you appear inactive. Thresholds are adjustable in the Watch app.
- Resting heart rate in Apple Health is Apple’s own daily estimate derived from those background samples, not a single measured reading.
Resting heart rate and long-term health
Zhang and colleagues pooled 46 prospective studies with 1,246,203 participants. Each 10 bpm increase in resting heart rate was associated with about a 9% higher risk of death from any cause and an 8% higher risk of cardiovascular death. Two cautions belong next to that figure: it is an association in population data, not a cause, and it says nothing about a single week’s readings. A resting rate that has drifted up over months is a question for a doctor. A rate that is high on Tuesday afternoon is a question for your calendar.
Reading these figures against a calendar
The population numbers set the frame; the calendar supplies the explanation. Three rules make the combination useful rather than alarming:
- Subtract the mechanical causes first. Standing, walking to a room, talking and caffeine can together account for 20–30 bpm before any stress is involved. A meeting reading of resting + 20 is unremarkable if you presented; it is worth noting if you sat and listened.
- Watch recovery, not peaks. Two events with the same peak can differ entirely in how long the rate takes to return to baseline. Recovery time is less confounded by movement and is the figure that identifies the expensive meeting. The meeting stress guide covers the method.
- Compare like with like over four to six weeks. One instance is anecdote. The same recurring event, across several weeks, against other instances of itself, is data.
Definitions used on this page
- Resting heart rate
- Beats per minute while awake, still and calm; measured after several minutes seated or, in Apple Health, estimated daily from background samples.
- Maximum heart rate
- The highest rate the heart can reach under maximal exertion; usually estimated from age rather than measured.
- Heart rate recovery
- The time, or the drop in bpm over a fixed interval, for heart rate to return toward baseline after an event or exercise.
- Calendar context
- Displaying heart rate samples on the same time axis as the events that were scheduled at the time, so a reading can be attributed to what was happening rather than interpreted in isolation.
Sources
- American Heart Association. All About Heart Rate (Pulse).
- American Heart Association. Target Heart Rates Chart.
- Mayo Clinic. What’s a normal resting heart rate?
- Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol. 2001;37(1):153–156. doi:10.1016/S0735-1097(00)01054-8
- Shcherbina A, et al. Accuracy in wrist-worn, sensor-based measurements of heart rate and energy expenditure in a diverse cohort. J Pers Med. 2017;7(2):3. doi:10.3390/jpm7020003
- Wang R, et al. Accuracy of wrist-worn heart rate monitors. JAMA Cardiol. 2017;2(1):104–106. doi:10.1001/jamacardio.2016.3340
- Perez MV, et al. Large-scale assessment of a smartwatch to identify atrial fibrillation. N Engl J Med. 2019;381:1909–1917. doi:10.1056/NEJMoa1901183
- Zhang D, Shen X, Qi X. Resting heart rate and all-cause and cardiovascular mortality in the general population: a meta-analysis. CMAJ. 2016;188(3):E53–E63. doi:10.1503/cmaj.150535
- Quer G, Gouda P, Galarnyk M, Topol EJ, Steinhubl SR. Inter- and intraindividual variability in daily resting heart rate and its associations with age, sex, sleep, BMI, and time of year. PLOS ONE. 2020;15(2):e0227709. doi:10.1371/journal.pone.0227709
- Kirschbaum C, Pirke KM, Hellhammer DH. The ‘Trier Social Stress Test’: a tool for investigating psychobiological stress responses in a laboratory setting. Neuropsychobiology. 1993;28:76–81. doi:10.1159/000119004
- Sheldon RS, et al. 2015 Heart Rhythm Society expert consensus statement on the diagnosis and treatment of postural tachycardia syndrome, inappropriate sinus tachycardia, and vasovagal syncope. Heart Rhythm. 2015;12(6):e41–e63. doi:10.1016/j.hrthm.2015.03.029
- Apple Support. Your heart rate. What it means, and where on Apple Watch you’ll find it.
- Apple Support. Heart rate notifications on your Apple Watch.
Where 70 BPM fits
70 BPM shows the heart rate samples Apple Health already holds on a day chart with your calendar events underneath, so a reading can be checked against the rows above: was this the seated baseline, standing, speaking, or something worth a second look. Free on the App Store for iPhone, on-device, no account.
70 BPM displays data Apple Health already holds. It is not a medical device and cannot diagnose anything. The figures on this page are population reference values, not thresholds for any individual. If a pattern worries you, or you notice symptoms alongside it, speak to a doctor rather than an app.