Polar Electro S720i User Manual download pdf (Page 93)

H. PRECAUTIONS

H 91

Using the Polar heart rate monitor in a water environment

Your Polar heart rate monitor is water resistant to 20 metres/ 60 feet. To

maintain the water resistance, do not operate the buttons of the wrist

receiver under water.

Heart rate measurement in a water environment is technically demanding

for the following reasons:

• Pool water with a high chlorine content and seawater may be very

conductive and the electrodes of Polar transmitter may get short

circuited and ECG signals cannot be detected by the transmitter unit.

• Jumping into the water or strenuous muscle movement during

competitive swimming may cause water resistance that shifts the

transmitter on the body to a location where it is not possible to

pick up ECG signal.

• The ECG signal strength varies depending on the individual’s tissue

composition and the percentage of people who have problems in heart

rate measuring is considerably higher in a water environment than in

other use.

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Polar Electro S720i User Manual Page 93