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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 new 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 exer-
tion, breathing rate, physical sensations), none of them are as reliable as measuring heart rate. It is object-
ive 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
To measure wrist-based heart rate accurately during training (and when using the
feature) make sure that you wear the watch correctly:
Wear your watch on top of your wrist, at least a finger's width up from the wrist bone (see the pic-
l
ture below).
Tighten the wristband firmly around your wrist. The sensor on the back must be in constant touch
l
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
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Continuous Heart Rate
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