A resting heart rate of 57 beats per minute is not bad for most people. While the standard “normal” range is 60 to 100 bpm, a heart rate just below that threshold is common in healthy adults and almost never a problem on its own. What matters far more than the number itself is whether you feel fine at that rate.
Why 57 BPM Falls in a Gray Zone
The textbook definition of bradycardia, or a slow heart rate, is anything below 60 bpm. By that strict cutoff, 57 bpm technically qualifies. But that definition is misleading for a lot of people. Population studies frequently use a lower cutoff of 50 bpm to define a meaningfully slow heart rate, and the American Heart Association uses a rate below 50 bpm (not 60) as one component when evaluating possible heart rhythm problems.
In other words, 57 bpm sits in a range that’s below the textbook normal but well above the level that cardiologists consider potentially problematic. Many people walk around with a resting heart rate in the mid-to-upper 50s and have zero health issues because of it.
When a Heart Rate in the 50s Is Completely Normal
Several everyday situations produce a resting heart rate around 57 bpm without anything being wrong.
Fitness. If you exercise regularly, your heart muscle is stronger and pumps more blood per beat. It doesn’t need to beat as often to move the same volume, so your resting rate drops. Athletes commonly have resting heart rates in the 40s and 50s, but you don’t need to be an elite athlete to see this effect. Consistent cardio exercise, even moderate amounts like brisk walking or cycling a few times a week, can lower your resting rate into the upper 50s over time.
Sleep and relaxation. Your heart rate naturally drops 20% to 30% below your daytime resting rate while you sleep. A healthy sleeping heart rate typically falls between 50 and 75 bpm. If you’re seeing 57 bpm on a smartwatch overnight or right after waking up, that’s completely expected.
Individual variation. Some people simply have a lower baseline heart rate. Genetics, body size, and overall cardiovascular health all influence where your resting rate settles. A consistent rate of 57 bpm without symptoms is just your normal.
Symptoms That Would Make It Concerning
Doctors don’t treat a slow heart rate based on the number alone. There is no established minimum heart rate below which treatment is automatically needed. The deciding factor is whether the slow rate is causing your brain and body to get too little blood flow. Symptoms of that include:
- Dizziness or lightheadedness
- Fainting or near-fainting episodes
- Unusual fatigue, especially during physical activity
- Shortness of breath
- Confusion or memory problems
- Chest pain
If you’re experiencing any of these alongside a heart rate in the 50s, the combination is worth investigating. The tricky part is that symptoms like fatigue can have many causes, so linking them specifically to a slightly low heart rate takes some clinical detective work. A doctor would typically look for a clear pattern: the symptoms appear when your heart rate drops and resolve when it comes back up.
If you have none of these symptoms, a resting rate of 57 bpm is almost certainly harmless.
Medications That Lower Heart Rate
If you take medication for high blood pressure, heart rhythm issues, or migraines, your prescription may be pulling your heart rate down. Beta-blockers and certain calcium channel blockers are specifically designed to slow the heart. A resting rate in the upper 50s can be a sign the medication is working as intended. If you’re concerned that it’s dropped too low or you’re noticing new fatigue or dizziness, that’s a conversation to have with whoever prescribed the medication rather than a reason to stop taking it on your own.
Non-Heart Causes of a Slower Pulse
A few medical conditions outside the heart can nudge your resting rate lower. The most common is an underactive thyroid (hypothyroidism), which slows your heart rate because thyroid hormones help regulate the pace of your heartbeat. Electrolyte imbalances, particularly low potassium or issues with calcium and magnesium levels, can also affect heart rhythm. These conditions come with their own sets of symptoms: weight gain, cold sensitivity, and dry skin for thyroid issues, or muscle cramps and weakness for electrolyte problems. If those symptoms sound familiar, a simple blood test can rule them in or out.
What to Actually Do With This Number
If you checked your pulse or glanced at your fitness tracker and saw 57 bpm, the most useful thing you can do is notice whether it’s a one-time reading or a consistent pattern. A single reading can be influenced by how relaxed you are, whether you just woke up, or even the accuracy of the device. Wearable heart rate monitors are reasonably accurate at rest but not perfect.
If your resting heart rate consistently sits in the upper 50s and you feel good, there’s nothing to fix. If it recently dropped from, say, the 70s to the 50s without a clear explanation like starting an exercise routine, or if you’re experiencing dizziness or unusual fatigue, that’s worth mentioning at your next medical visit. The rate itself isn’t dangerous. The question is always whether it’s causing problems you can feel.