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TRAINING
WRIST-BASED HEART RATE MEASUREMENT
Your watch measures your heart rate from the wrist with the Polar Precision Prime sensor fusion technology. This heart
rate innovation combines optical heart rate measurement with skin contact measurement, ruling out any disturbances to the
heart rate signal. It tracks your heart rate accurately even in the most demanding conditions and training sessions.
Although there are many subjective clues as to how your body is doing during exercise (perceived exertion, breathing rate,
physical sensations), none of them are as reliable as measuring heart rate. It is objective and affected by both internal and
external factors—meaning that you will have a dependable measure of your physical state.
WEARING YOUR WATCH WHEN MEASURING HEART RATE FROM YOUR WRIST OR TRACKING
YOUR SLEEP
To measure wrist-based heart rate accurately during training, when using the Continuous heart rate and Nightly Recharge
features or while tracking your sleep with Sleep Plus Stages make sure that you wear the watch correctly:
lWear your watch on top of your wrist, at least a finger’s width up from the wrist bone (see the picture below).
lTighten the wristband firmly around your wrist. The sensor on the back must be in constant touch with your skin and
the watch should not be able to move on your arm. A good way to check that the wristband is not too loose is if you
push the wristband lightly up from both sides of your arm and make sure the sensor doesn’t lift from your skin. When
pushing the wristband up you shouldn't see the LED light shining from the sensor.
lFor most accurate heart rate measurement, we advise you to wear your watch for a few minutes prior to starting the
heart rate measurement. Also it's a good idea to warm up the skin if your hands and skin get cold easily. Get the blood
going before starting your session!
During training you should slide the Polar device further up from the wrist bone and wear the wristband a bit
more tightly to try to minimize any extra moving of the device. Give your skin a few minutes to adapt to the Polar
device before starting a training session. After the training session, loosen the wristband a bit.
If you have tattoos on the skin of your wrist, avoid placing the sensor right on them as they may prevent accurate readings.
In sports where it's more challenging to keep the sensor stationary on your wrist or where you have pressure or movement in
muscles or tendons near the sensor, we recommend using a Polar heart rate sensor with a chest strap (Polar H10 or H9) or
Polar OH1 optical heart rate sensor that measures heart rate from your arm or temple. The Polar H10 and H9 heart rate
sensors are more responsive to rapidly increasing or decreasing heart rate, so they are an ideal option also for interval type
of training with quick sprints and provide supreme accuracy in your training. Polar OH1 is a compact optical heart rate
sensor that measures heart rate from your arm or temple. It's versatile and offers a great option to heart rate chest straps
and wrist-based heart rate devices. See Compatible sensors for further information.
To maintain the best possible performance of the wrist-based heart rate measurement, keep your watch clean
and prevent scratches. After a sweaty training session, we recommend that you wash the watch under running
water with a mild soap and water solution. Then wipe it dry with a soft towel. Let it fully dry before charging.
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