POLAR M21 - Manual (Page 45)

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PRECAUTIONS
U S I N G A P O L A R H E A R T R A T E
M O N I T O R I N A W A T E R
E N V I R O N M E N T
Your Polar Heart Rate Monitor is water resistant to 100
feet/ 30 meters. 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 EKG 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 EKG signal.
• The EKG 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.
P O L A R H E A R T R A T E M O N I T O R
A N D I N T E R F E R E N C E
ELECTROMAGNETIC INTERFERENCE
Disturbances may occur near high voltage power lines,
traffic lights, overhead lines of electric railways, electric bus
lines or trams, televisions, car motors, bike computers, some
motor driven exercise equipment, cellular phones or when
you walk through electric security gates.
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