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Continuous Heart Rate

Continuous Heart Rate

Track your heart rate around the clock

With continuous heart rate monitoring you can get a comprehensive view on how your heart behaves during the day as well as when you sleep.

Get a complete overview of your daily activity

Continuous heart rate tracking helps you to see how your heart behaves during your day and sleep. Heart rate measurements combined with activity information can help you to learn what are the most meaningful physical activity moments during your day.

More precise activity data

With continuous heart rate tracking even the activities where your physical effort is increased but arms are not moving, such as cycling, can be counted towards your daily activity goal. Learn more

Learn how your activities stack

Continuous Heart Rate feature tracks all your daily activities, so you can see what kind of health benefits your activity has.

Understand how your heart behaves 24/7

Different things can cause your heart rate to change during the day. Your heart rate changes in response to the demands of your muscles during daily activities or fluctuate over the course of night. Also stress and emotions can cause changes in your heart rate.

Learn more

How Continuous heart rate tracking works

Polar’s proprietary optical heart rate solution tracks your heart rate from the wrist easily and comfortably every day and night. Continuous Heart Rate is a feature that complements the 24/7 Activity Tracking feature of Polar devices.

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Compatible products

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Continuous Wrist-Based Heart Rate

To help you achieve your health and fitness goals we're proud to introduce continuous heart rate tracking – available on the new Polar A370 fitness tracker.

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Make every activity count

If your choice of physical activity includes physical effort with minimal wrist movements, like when you’re pushing a baby stroller, carrying groceries or cycling, your overall activity will be tracked better with the Continuous Heart Rate feature, and also this kind of activity will now add to your progress towards reaching your Activity Goal.

The higher your measured heart rate during physical activity, the higher the recorded activity level will be, therefore also physical effort can be taken into account, e.g. when walking uphill or carrying a heavy backpack.

What causes the changes in my heart rate during the day?

Demand to your muscles

Your heart rate mainly changes in response to the demands of your muscles during daily activities. For example, your heart has to pump harder when you’re cycling than when you’re sitting down because your heart delivers the oxygen and energy nutrients that your muscles need in order to provide more energy for your activities through your bloodstream.

Stress and emotions

Other reasons that cause changes in your heart rate can also be stress and emotions. For example, excitement can raise your heart rate. If you are competing athlete, you probably see elevated heart rate before the race and during it. The nervousness or anxiety that you feel before competitions seems to push your heart rate up. Your body's natural hormones prepare you to the challenge.


During sleep, your heart rate normally slows due to the complex regulatory mechanisms in your body. There is no standard range for heart rate during sleep, because it is affected by your age, sex, cardiovascular fitness level and medications.

Your heart rate also fluctuates over the course of night. The changes in your heart rate during a typical night’s sleep partly reflect the changes in the depth of your sleep.

The lowest heart rate during sleep can occur at different times on different nights. This reading often occurs when you’re in one of the deepest states of sleep. You should, however, be aware that the lowest heart rate during your sleep is different from the resting heart rate. The resting heart rate is measured when you’re awake and lying down.