A slow pulse can mean fitness, while an irregular one deserves a closer look

Key takeaways

• The American Heart Association puts a normal adult resting heart rate at 60 to 100 beats a minute, and it can dip below 60 in fit people or during sleep without any problem¹⁴.
• In a 2016 analysis of 46 studies with more than 1.2 million people, each 10 extra resting beats a minute went with about 9% higher risk of death, a link that doesn’t prove the pulse itself is the cause⁵.
• The “220 minus your age” formula traces back to about 10 studies; a 2001 analysis of 18,712 adults found it underestimates older adults’ top heart rate by about 10 beats by age 70⁶.
• In a six-month Australian trial of heavy drinkers with atrial fibrillation, AFib came back in 53% of those who cut from about 17 drinks a week to 2, versus 73% of those who kept drinking¹⁰.
• Call 911 if your pulse turns suddenly much faster or slower than your normal and you have chest pain, shortness of breath, dizziness or fainting, the AHA says¹.

Can a person with atrial fibrillation, the most common heart rhythm problem⁸, keep drinking coffee? In November 2025, a trial put that question to a direct test¹¹.

Researchers at five hospitals in the United States, Australia and Canada enrolled 200 current or recent coffee drinkers with persistent AFib or a related rhythm who were about to have their heartbeat reset with an electric shock¹¹. Half were told to drink at least one cup of caffeinated coffee a day. The other half gave up coffee, decaf included, and other caffeine¹¹.

Six months later, AFib had come back in 47% of the coffee drinkers and 64% of those who abstained¹¹. By our math, that’s about 17 fewer people with a recurrence for every 100 who kept their coffee.

It was one trial, and everyone knew their group. But it shows how much ordinary advice about the heart’s rhythm is being retested.

Your watch now reports your pulse all day, and some will flag AFib. Below, we cover what those numbers mean, which patterns deserve a visit, and what habits and screening can and can’t do.

Normal covers a 40-beat range, and lower often means fitter

The AHA defines a normal resting heart rate as 60 to 100 beats per minute, measured while you’re sitting or lying down, calm and well¹. Athletes often run lower because their heart muscle is well conditioned and doesn’t have to work as hard¹.

Doctors call a resting rate under 60 bradycardia and one over 100 tachycardia³⁴. Neither always means trouble. Your heart can drop below 60 while you sleep, and a rate over 100 can be a short-lived response to something else¹⁴.

Plenty of everyday things push your pulse up. The AHA lists heat and fever, stress, anxiety, strong emotions and pain¹. Dehydration, too much caffeine or alcohol, and lack of sleep can trigger a fast rhythm in some people³. Anemia, infection and an overactive thyroid can raise it, too³.

Standing up can nudge it higher for a few minutes, while some medicines, such as beta blockers and calcium channel blockers, slow it¹.

One more sign of fitness: after exercise, a trained heart returns to its resting rate sooner¹. Our wearable baselines article explains why your own usual number matters most.

Your resting pulse carries a risk signal, with fine print

In 2016, researchers at Qingdao University in China pooled 46 long-term studies of the general population⁵. For death from any cause, the analysis covered more than 1.2 million people followed for 3 to 40 years⁵.

Each 10 extra resting beats per minute went with about a 9% higher risk of death from any cause and an 8% higher risk of cardiovascular death⁵. People above 80 beats had about 45% higher risk than those in each study’s lowest group⁵.

Those are relative numbers. By our math, about 6 in 100 people in these studies died during follow-up, so a 9% bump adds roughly half a death per 100 people for each 10 beats.

The authors named real limits⁵. The studies were observational, so other differences between people may explain part of the link. After adjusting for signs that smaller negative studies went unpublished, the risk per 10 beats shrank to about 4%⁵. The authors also note a drug trial in people with stable heart disease where slowing the heart brought no benefit, so lowering the number by itself isn’t proven to help⁵.

The practical reading: a resting rate that runs high, or creeps up over months, is a nudge to look at fitness, sleep, alcohol and possible medical causes with a clinician.

The famous maximum heart rate formula rests on thin data

The AHA’s target heart rate chart estimates your maximum as about 220 minus your age². Moderate exercise is about 50% to 70% of that number, and vigorous exercise about 70% to 85%².

That formula has humble roots. In 2001, Tanaka and colleagues traced it to 1970s reviews drawing on about 10 studies, with no one older than 65⁶. The team then pooled 351 studies of 18,712 healthy adults and found a better fit: 208 minus 0.7 times your age⁶.

The two formulas agree near age 40⁶. After that, 220 minus age runs low, by about 10 beats at age 70⁶. By our math, a 60-year-old gets 160 from the old formula and 166 from the newer one.

Neither formula is personal. Real maximums scatter about 10 beats around the prediction⁶. Sex and training didn’t change the pattern in the Tanaka data, but the formulas may not fit people with heart disease or those taking heart medicines⁶. The AHA says some medicines lower your maximum and target zone, so ask your clinician what your range should be².

For everyday exercise, your breathing is often a better gauge than a formula. Our cardio fitness article explains the talk test.

The pulse check routine

You don’t need a device to learn your own rhythm. Two fingers and a clock will do.

1. Pick a calm moment. Sit or lie quietly, rested and feeling well¹.
2. Find your pulse. Place your index and middle fingers lightly on the artery inside your wrist¹.
3. Count for a full 60 seconds¹. A full minute also lets you notice the rhythm.
4. Feel the rhythm, not just the rate. The U.S. Preventive Services Task Force treats feeling the pulse as the usual way clinicians check for AFib¹².
5. Write it down with the date and time, and repeat on a few days to learn your usual range.
6. Compare with your watch, if you wear one, and note any big gaps to mention at your next visit.

Then compare what you find with these patterns.

What you notice	What it may mean	What to do
Resting rate in the 40s or 50s, and you feel fine	Often fitness, sleep or a medicine14	Nothing urgent; note it as your baseline
Slower or faster than your usual, with weakness, dizziness or a faint feeling	A rhythm or medical problem1	Tell your clinician1
A resting rate over 100 with no fever, pain, anxiety or exercise to explain it	Possible tachycardia that needs a look3	Tell your clinician13
An irregular pulse, or an AFib alert on a watch	Possible AFib, which can go undetected812	Book a visit so a clinician can confirm it and weigh your stroke risk9; bring your notes
Racing heart and lightheadedness every time you stand	Possible POTS14	Ask a clinician about heart rate and blood pressure checks or a tilt table test14
A sudden, big jump or drop from your normal rate, with chest pain, shortness of breath, dizziness or fainting	Possible emergency1	Call 9111
Someone collapses and doesn’t respond or isn’t breathing normally	Possible cardiac arrest15	Call 911, start hands-only CPR and use an AED15

AFib is common, often unnoticed, and responds to habits

Atrial fibrillation is an irregular, often fast rhythm in the heart’s upper chambers⁸. In 2024, an NHLBI-supported study of more than 29 million California patients estimated that at least 10.55 million U.S. adults, about 1 in 22, have it⁷. That’s about three times an older projection of 3.3 million for 2020⁷.

AFib matters mainly because of stroke. When the upper chambers beat rapidly and irregularly, they don’t fully move blood along, so it can pool and form a clot that travels to the brain, the Task Force explains⁸. AFib can also go undetected⁸.

The 2023 AFib guideline from the American College of Cardiology, the AHA and two other groups treats AFib as a disease with stages⁹. They run from “at risk” through “pre-AFib” to episodes that come and go and, finally, AFib that persists or becomes permanent⁹.

That staging puts habits at the center. For people with AFib, the guideline calls for⁹:

• weight loss for those with a body mass index above 27;
• moderate to vigorous exercise, aiming for 210 minutes a week;
• quitting tobacco;
• cutting back on alcohol or avoiding it;
• good blood pressure control and screening for breathing problems during sleep.

This is where natural health and cardiology meet. The guideline’s first tools are ones many readers already value: a healthy weight, regular movement, no tobacco and less alcohol⁹. They work alongside the medicines and procedures that prevent strokes, not instead of them.

The alcohol advice has unusually direct proof. In an Australian trial published in 2020, 140 people with AFib who drank at least 10 standard drinks a week were assigned to quit or keep drinking as usual¹⁰. The abstainers dropped from about 17 drinks a week to 2¹⁰.

Over six months, AFib returned in 53% of the abstainers and 73% of the usual drinkers, and the abstainers spent less time in AFib¹⁰. By our math, about 1 in 5 heavy drinkers avoided a recurrence by cutting back. The trial studied heavy drinkers only, and both groups knew their assignment¹⁰.

The guideline uses a stroke risk score to decide who needs a blood thinner, and it says aspirin alone isn’t a substitute⁹. That choice belongs with your clinician.

If you take fish oil pills, our fish oil article covers what large trials found about them and AFib.

Coffee went from suspect to possible ally

The DECAF authors concluded that people with AFib may reasonably keep coffee and other caffeinated drinks¹¹. It was one trial of 200 people, mostly men with an average age of 69, so it isn’t the last word¹¹.

Who paid? Government and charity grants in the U.S. and Australia supported the researchers, and the funders had no role in the study. Several authors disclosed fees from heart-device and drug makers, but no coffee company appears in the disclosures¹¹.

Caffeine isn’t harmless for every rhythm. The AHA still lists it among possible triggers of supraventricular tachycardia, a different fast rhythm³. If coffee reliably sets off pounding or racing in you, that’s your answer, whatever the trials say.

Watches find more AFib, but whether that prevents strokes is unproven

In January 2022, the U.S. Preventive Services Task Force said the evidence was insufficient to weigh the benefits and harms of screening adults 50 and older for AFib when they have no symptoms¹². That “I” grade isn’t a recommendation against screening¹². The Task Force’s page still listed that 2022 statement when we checked in October 2026¹².

The Task Force counted watches, phone apps and patches among the screening tools¹². Its list of harms included anxiety, false alarms, extra testing and bleeding from blood thinners¹².

Two big trials show the puzzle. In LOOP, 1,501 people got a small implanted heart monitor and 4,503 got usual care¹³. Over about five years, the monitors found AFib lasting at least six minutes in 31.8% of people, versus 12.2% with usual care¹³. More people started blood thinners, yet strokes didn’t drop significantly¹³.

In STROKESTOP, people invited to repeated ECG checks had a slightly lower rate of a combined outcome of stroke, clots, serious bleeding and death: 31.9% versus 33.0% over about seven years¹³. By our math, that’s about 11 fewer events per 1,000 people. Ischemic stroke alone didn’t differ significantly¹².

Short episodes are part of the problem. The 2023 guideline says episodes under five minutes, with no other reason for treatment, shouldn’t lead to blood thinners⁹. Bodies also disagree: the European Society of Cardiology’s 2020 guideline recommends checking the pulse or a rhythm strip opportunistically in people 65 and older¹³.

An alert still deserves a proper heart recording and a conversation, not panic. Our smartwatch article covers the big Apple and Fitbit studies and what to do next.

Too slow, too fast, or racing when you stand

Slow. A slow rate becomes a problem when it cuts blood flow to the brain, causing tiredness, dizziness, confusion, fainting or shortness of breath⁴. Causes include wear on the heart’s natural pacemaker, a blocked electrical signal called heart block, low thyroid, certain heart medicines and sleep apnea⁴. Borderline cases may need nothing, while severe ones may need a pacemaker⁴.

Fast. Sinus tachycardia means the normal pacemaker is simply firing fast, as it does during exercise; at rest, it’s worth checking³. Supraventricular tachycardia starts above the main pumping chambers and can come and go³. Ventricular tachycardia starts in the lower chambers and can be life-threatening³. Our vagus nerve article covers a tested maneuver for one fast rhythm.

Racing when you stand. Postural tachycardia syndrome, or POTS, is defined by heart rate: a rise of more than 30 beats, or to over 120, within 10 minutes of standing, or a rise of at least 40 in teens¹⁴. It mostly affects people ages 15 to 50, more often women, and often starts after a viral illness, including COVID-19, or after pregnancy or surgery¹⁴. Salt, fluids, waist-high compression, gradual exercise and some medicines can help, with a clinician’s guidance¹⁴.

Heart rhythm claims, rated

Claim	Rating	Why
A higher resting heart rate goes with higher death risk	Strong evidence	46 cohort studies; a link, not proof of cause5
Heavy drinkers with AFib who stop drinking have fewer recurrences	Strong evidence	A randomized trial, 53% vs 73%, and the 2023 guideline advises cutting back910
Daily coffee doesn’t make AFib more likely to come back	Promising but early	One open-label trial of 200 people with persistent AFib found fewer recurrences with coffee11
Using a drug to lower your resting heart rate helps you live longer	Not enough evidence	The meta-analysis authors cite one trial in heart patients that found no benefit5
220 minus age predicts your personal maximum	Evidence says no, or unsafe	Real maximums scatter about 10 beats around the formula, and it runs low in older adults6
Screening people without symptoms prevents strokes	Not enough evidence	Task Force “I” grade; LOOP found more AFib, not fewer strokes1213

Questions readers ask

The bottom line

Your pulse is a free, useful health signal. A normal resting rate spans 60 to 100, a slower rate often reflects fitness, and a rate that runs high is worth a look at habits and possible causes. Formulas for your maximum are rough guides, not rules.

The rhythm matters as much as the rate. AFib is common, raises stroke risk and responds to weight, exercise and especially alcohol, while coffee looks less guilty than once thought. Screening finds more AFib without yet showing fewer strokes, so treat an alert as a reason for a proper test. Learn your own pulse, know the emergency signs, and keep a clinician involved in any medicine decision.

Related reading

• Clogged leg arteries often hide, and when they hurt, Medicare pays for walking
• Smartwatch health alerts are better at warning you than reassuring you
• Your wearable’s best number is your own normal, not the average
• Low fitness rivals smoking as a health risk, and cardio can change it
• A Decade of Big Fish Oil Trials Shrank the List of What It Does

Sources

1. American Heart Association. “All About Heart Rate.” Last reviewed May 13, 2024. heart.org
2. American Heart Association. “Target Heart Rates Chart.” Last reviewed August 12, 2024. heart.org
3. American Heart Association. “Tachycardia: Fast Heart Rate.” Last reviewed September 24, 2024. heart.org
4. American Heart Association. “Bradycardia: Slow Heart Rate.” Last reviewed September 25, 2024. heart.org
5. 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. pubmed.ncbi.nlm.nih.gov
6. Tanaka H, Monahan KD, Seals DR. “Age-Predicted Maximal Heart Rate Revisited.” Journal of the American College of Cardiology, 2001;37:153–156 (copy hosted by the University of Murcia). webs.um.es
7. National Heart, Lung, and Blood Institute. “Atrial Fibrillation Estimated to Affect About 1 in 22 Americans.” News release, September 12, 2024. nhlbi.nih.gov
8. U.S. Preventive Services Task Force. “Task Force Issues Final Recommendation Statement on Screening for Atrial Fibrillation.” Bulletin, January 25, 2022. uspreventiveservicestaskforce.org
9. Crawford TC (key perspectives author), on Joglar JA, Chung MK, Armbruster AL, et al. “2023 ACC/AHA/ACCP/HRS Guideline for the Diagnosis and Management of Atrial Fibrillation: Key Perspectives.” American College of Cardiology, November 30, 2023. acc.org
10. American College of Cardiology. “Alcohol Abstinence in Drinkers With Atrial Fibrillation” (journal scan of Voskoboinik A, Kalman JM, De Silva A, et al., New England Journal of Medicine, 2020). January 14, 2020. acc.org
11. Wong CX, et al., Marcus GM (senior author). “Caffeinated Coffee Consumption or Abstinence to Reduce Atrial Fibrillation: The DECAF Randomized Clinical Trial.” JAMA, 2026;335(4):317–325 (published online November 9, 2025). jamanetwork.com (funding, role of funders and disclosures read on the JAMA Network Learning version: edhub.ama-assn.org)
12. U.S. Preventive Services Task Force. “Atrial Fibrillation: Screening.” Final recommendation, January 25, 2022. uspreventiveservicestaskforce.org
13. Greenland P, et al. “Screening for Atrial Fibrillation—More Data Still Needed.” JAMA, 2022 (editorial). pubmed.ncbi.nlm.nih.gov
14. National Institute of Neurological Disorders and Stroke. “Postural Tachycardia Syndrome (POTS).” Last reviewed March 13, 2026. ninds.nih.gov
15. American Heart Association. “Treatment of Cardiac Arrest.” Last reviewed September 14, 2026. heart.org