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How does the Withings Pulse measure my heart rate?

The Withings Pulse uses an optoelectronic sensor, as well as a red LED, to measure your heart rate through your finger.
The sensor will pick up small color changes on the surface of your skin that are in sync with your pulse. These changes are caused by blood flow changes from your heart pumping.

Why is tracking my heart rate useful?

Your resting heart rate is an indication of your overall fitness level. A lower heart rate at rest implies more efficient heart function and better cardiovascular fitness. You will see your resting heart rate decrease as you are moving toward a more active lifestyle.
It's also important to be aware of your maximum working heart rate during a run or work-out session.

How many heart rate measurements can the Pulse store?

The Withings Pulse displays your last measurement but is able to save up to 20 measurements. All of the saved measurements will be sent to the Health Mate app during the next synchronization. 

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