Resting Heart Rate: What Your Wearable Shows and What Your Health Report Explains

Learn what resting heart rate means, what a normal RHR is, why it rises, and which health report markers, from thyroid and haemoglobin to HbA1c and hs-CRP, help explain your number.

Genie Health Editorial Team · 12 August 2026 · 13 min read

What your resting heart rate is telling you

Resting heart rate (RHR) is the number of times your heart beats per minute when you are fully at rest, relaxed and not recently active. For most adults it sits between 60 and 100 beats per minute (bpm). A lower, steady RHR usually reflects a fitter and more efficient heart.

Wearables such as Oura, WHOOP, Fitbit, Garmin, Apple Watch and Google's Pixel Watch now track RHR every day, which makes it one of the easiest health signals to follow over time. They can show you when your RHR changes, but they cannot tell you why.

Often, part of the answer sits in your health report. Thyroid hormones, haemoglobin and inflammation markers can push your RHR up or down, while a persistently high RHR tends to travel with higher blood sugar, blood pressure and other signs of metabolic strain. Reading your wearable data alongside your health screening results helps you understand what your number means.

What is resting heart rate?

Your heart rate changes constantly. It climbs when you walk up stairs, drink coffee or feel anxious, and falls when you sit down and relax. Resting heart rate is your heart rate at its calmest point, when your body only needs enough blood flow to keep its basic functions running. That makes it a baseline, and a much more useful number to track than your heart rate at any random moment.

RHR is set largely by the autonomic nervous system, the part of the nervous system that runs automatically. Its "rest and digest" branch slows the heart, while its "fight or flight" branch speeds it up. A fit heart pumps more blood with each beat, so it needs fewer beats per minute at rest. Thyroid hormones, oxygen levels in the blood, inflammation and stress hormones all influence this balance, which is why RHR connects so closely to other health markers.

How wearables measure resting heart rate

Each wearable calculates RHR a little differently, so numbers are not directly comparable between devices.

• Apple Health (Apple Watch) estimates RHR by combining heart rate readings with motion data during periods of inactivity, which includes both sedentary moments during the day and overnight sleep if you wear the watch to bed.
• Oura focuses on your heart rate during sleep, highlighting your lowest overnight heart rate and comparing it with your recent baseline.
• WHOOP measures RHR during sleep, weighted towards your last period of deep (slow-wave) sleep.
• Fitbit and Google (Pixel Watch) combine heart rate data from periods when you are awake and still with data from sleep.
• Garmin uses the lowest 30-minute average heart rate over the day.

Because sleep-based readings tend to be lower than daytime readings, devices that rely only on sleep, such as Oura and WHOOP, may show a few beats lower than devices that also use daytime readings. What matters most is following your own trend on the same device.

What is a normal resting heart rate?

The American Heart Association and Mayo Clinic describe a normal adult RHR as 60 to 100 bpm. In practice, many healthy adults sit somewhere in the 50s to 70s, and well-trained endurance athletes often have an RHR in the 40s. Women tend to have a slightly higher RHR than men, and fitness, age, body weight, medications and even the time of year all play a part.

Within that wide range, your own baseline matters more than any population figure. A study of more than 92,000 wearable users found that average RHR varied from 40 to 109 bpm between individuals, yet each person's RHR stayed fairly stable over time. That means a change from your usual number is often more meaningful than where you sit in the range. Oura, for example, treats a rise of around 3 to 5 bpm above your normal RHR as a sign of physical stress, strain or illness.

As a general guide:

• Below 60 bpm: common and usually healthy in fit, active people.
• 60 to 80 bpm: within the typical range for most adults.
• 80 to 100 bpm: still technically normal, but at the higher end. A persistent RHR here is worth paying attention to.
• Consistently above 100 bpm at rest: a reason to see a doctor.

Mayo Clinic advises speaking to a doctor if your RHR is consistently above 100 bpm, or below 60 bpm if you are not an athlete, especially if it comes with dizziness, fainting or shortness of breath. A sudden, unusually high or low heart rate alongside chest pain or breathlessness needs urgent medical attention.

Why your resting heart rate rises

Most day-to-day rises in RHR have everyday causes, and they settle once the trigger passes. These are the most common.

• Illness and infection: Your RHR often rises when your immune system is fighting an infection, sometimes a day or two before you feel unwell. A fever pushes it higher still.
• Poor sleep and overtraining: Short sleep, or hard training without enough recovery, keeps the "fight or flight" side of the nervous system switched on and lifts your RHR the next morning.
• Alcohol: Even moderate drinking in the evening can raise overnight heart rate and disrupt sleep, which is why Oura and WHOOP users often see a jump after a night out.
• Dehydration and heat: Less fluid in the blood means the heart has to beat faster to keep blood flowing.
• Stress: Ongoing mental or emotional stress raises stress hormones such as cortisol and adrenaline, which keep your heart rate elevated even at rest.
• Caffeine, nicotine and some medications: Stimulants, decongestants and certain asthma inhalers can all raise heart rate.

When your RHR stays above your baseline for weeks rather than days, and none of these explain it, that is when your health report becomes especially useful.

What a high resting heart rate means for long-term health

A persistently high RHR is more than a fitness statistic. It reflects how hard your heart has to work every minute of the day, and large studies link it to long-term health.

A meta-analysis of 46 studies covering more than 1.2 million people found that every 10 bpm increase in RHR was associated with a 9% higher risk of death from any cause and an 8% higher risk of death from cardiovascular disease. Compared with people at the lowest end, those with an RHR above 80 bpm had a 45% higher risk of death from any cause. These links held even after accounting for traditional risk factors such as blood pressure and cholesterol.

This does not mean a high RHR causes these outcomes on its own. It is better seen as a signal of what is happening underneath, such as lower fitness, a nervous system stuck in "fight or flight" mode, or metabolic strain. The encouraging part is that RHR responds to change. Regular aerobic exercise, better sleep, less alcohol and managing stress can all bring it down over weeks to months.

Connecting the dots: why wearable data alone falls short

Your wearable is good at spotting change. Oura, WHOOP or Fitbit can show that your RHR has crept up by 6 bpm over a month, and may suggest familiar reasons such as alcohol, late meals or poor sleep. What it cannot see is what is happening inside your body, such as an overactive thyroid or low haemoglobin on your last blood test.

Your health report has the opposite limitation. It captures your biology at a single point in time, but says nothing about how your heart has been behaving day to day. RHR is not a habit you change directly. It is an indicator, a reading that reflects what is going on in the rest of your body. Health report markers relate to it in two ways: some can directly push your RHR up or down, while others tend to rise alongside a persistently high RHR as part of the same underlying picture.

Health markers that can push your resting heart rate up or down

When your RHR moves away from your usual baseline and stays there, a few common conditions that show up on a blood test are worth ruling out. Each of these can directly change how fast your heart beats at rest.

Thyroid function (TSH, free T3 and free T4)

Your thyroid sets the pace of your metabolism, and it acts directly on the heart's natural pacemaker. Research on thyroid disease and the heart shows that thyroid hormones increase heart rate and the amount of blood the heart pumps. An overactive thyroid (hyperthyroidism) often raises RHR, sometimes well above 100 bpm, along with symptoms such as palpitations, heat intolerance, weight loss and anxiety. An underactive thyroid (hypothyroidism) does the opposite and can slow your RHR, often alongside tiredness, feeling cold and weight gain.

This makes thyroid function the one common marker that can explain both an unusually high and an unusually low RHR. TSH is the usual first test and is included in many standard health screening panels, with free T4 and free T3 checked if TSH is out of range. Restoring normal thyroid levels usually brings heart rate back to normal.

Haemoglobin and iron stores (ferritin)

Haemoglobin is the protein in red blood cells that carries oxygen. When it runs low, as in anaemia, each heartbeat delivers less oxygen to your tissues, so the heart compensates by beating faster. Mayo Clinic lists anaemia as one of the causes of a faster-than-normal heart rate.

Iron deficiency is the most common cause of anaemia, and ferritin, which reflects your iron stores, can fall well before haemoglobin does. Low vitamin B12 or folate can also lead to anaemia. On a wearable, this may show up as a gradual rise in RHR, often with fatigue, breathlessness on exertion or a lower tolerance for exercise. A full blood count (including haemoglobin) and ferritin are the key markers to check.

Infection and inflammation (CRP and white blood cell count)

When your body is fighting an infection, your RHR rises as part of the immune response, and wearables frequently pick this up before symptoms appear. Higher C-reactive protein (CRP) and a raised white blood cell count on a blood test point to an active infection or inflammation. In this case, the RHR rise is usually temporary and returns to baseline after recovery, so it is worth rechecking your trend once you are well.

Health markers that tend to rise alongside a high resting heart rate

A persistently high RHR, without an obvious cause like illness or a thyroid problem, often travels with other markers of heart and metabolic strain. These markers do not usually cause the high RHR directly. Instead, they share the same underlying drivers: low cardiovascular fitness, a nervous system tilted towards "fight or flight", excess body fat and insulin resistance. In this sense, a rising RHR can be an early signal that is worth reading alongside your health report.

The Project Baseline Health Study, which compared wearable-measured RHR with a wide range of clinical measures, found that higher RHR was associated with differences in medical conditions, vital signs and lab results in both women and men.

Blood sugar (HbA1c and fasting glucose)

Higher RHR is consistently linked to poorer blood sugar control. A meta-analysis of 13 studies found that each 10 bpm increase in RHR was associated with a 17% higher risk of developing type 2 diabetes. Insulin resistance and high blood sugar can affect the nerves that regulate heart rate, while low fitness and excess weight raise both RHR and blood sugar at the same time. If your RHR has been trending up and your HbA1c or fasting glucose is creeping towards the higher end, the two are worth looking at together.

Blood pressure

RHR and blood pressure are both shaped by the autonomic nervous system, and the two often rise together. People with a higher RHR are more likely to have high blood pressure, and an elevated RHR has been linked to a greater chance of developing it in the future. Blood pressure is not a blood test, but it is part of almost every health screening and is one of the most useful numbers to pair with your wearable RHR.

Low-grade inflammation (hs-CRP)

High-sensitivity CRP (hs-CRP) measures the low-level, long-term inflammation linked to heart disease, which is different from the short-term spike seen during an infection. Large cohort studies have found that people with a higher RHR tend to have higher hs-CRP, even after accounting for other risk factors. Researchers believe the link reflects the nervous system's role in regulating both heart rate and inflammation.

Cholesterol and triglycerides

A higher RHR is also linked to metabolic syndrome, a cluster of risk factors that includes high triglycerides, low HDL ("good") cholesterol, high blood pressure, high blood sugar and excess abdominal fat. The connection with your lipid profile is mostly indirect and runs through shared causes such as low physical activity and excess weight. Seeing a high RHR alongside rising triglycerides or falling HDL adds weight to the case for more regular aerobic exercise.

Reading your RHR alongside your health report

Here's a quick guide to common wearable patterns and the health report markers that can help explain them.

What about a low resting heart rate?

A low RHR is usually good news. In people who exercise regularly, an RHR in the 50s, or even the 40s for endurance athletes, reflects a strong, efficient heart. A low RHR is only a concern when it is unusual for you, or when it comes with symptoms such as dizziness, fainting, unusual tiredness or shortness of breath. An underactive thyroid is one of the more common explanations a blood test can reveal, and certain heart medications can also slow the heart. If your RHR drops well below your normal range and you feel unwell, speak to a doctor.

How Genie brings your heart rate and health data together

Genie connects with Oura, WHOOP, Fitbit, Apple Health and Google Health, and lets you upload health reports and screening results into your Health Locker, where markers are tracked across reports over time.

Sparks surfaces the connections between these sources through insight cards. A Connected Signals card might point out that your RHR has risen over the past two months while the TSH on your latest report has dropped below range, or that a steadily higher RHR coincides with an HbA1c that has crept up across two reports. Genie helps you see relationships that are easy to miss when you look at one number at a time.

Ask Genie lets you ask questions in plain language, such as "Why has my resting heart rate gone up?" or "Is my heart rate linked to my blood test results?". Genie considers your wearable trends, report history and family history together, and answers in that wider context. It can also help you prepare questions for your next doctor's visit.

Conclusion: a simple number that connects to the rest of your health

Resting heart rate is one of the simplest numbers your wearable tracks, and one of the most revealing. Short-term rises usually point to illness, poor sleep, alcohol or stress. A sustained change from your baseline can reflect thyroid function, anaemia or inflammation, while a persistently high RHR often travels with higher blood sugar, blood pressure and other signs of metabolic strain.

Viewing your RHR trend alongside your health reports helps you understand what your number means and gives you more focused conversations with your doctor. Connect your wearable and upload your lab reports to Genie to see your complete health picture in context.

Note: This article is for education and awareness only. Genie does not provide medical advice. Please consult a healthcare professional for anything specific to your health.

Read Next: Heart Rate Variability: What Your Wearable Shows and What Your Health Report Explains

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