POLAR M71ti - Manual (Page 35)

35
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
Polar M71 ti Heart Rate Monitor is water resistant to 160
feet/50 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
PRECAUTIONS