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Forerunner 405 Owner’s Manual 35
Using Accessories
Synthetic fabrics that rub or ap
against the heart rate monitor
can create static electricity that
interferes with heart rate signals.
• Move away from sources of
strong electromagnetic elds and
some 2.4 GHz wireless sensors,
which can interfere with your
heart rate monitor. Sources of
interference may include very
high voltage power lines, electric
motors, microwave ovens,
2.4 GHz cordless phones, and
wireless LAN access points.
Heart Rate Zones
Consult your
physician to specify heart
rate zones/targets that are
appropriate for your tness
level and health condition.
Many athletes are using heart rate
zones to measure and increase their
cardiovascular strength and improve
their level of tness. A heart rate
zone is a set range of heartbeats per
minute. The ve commonly accepted
heart rate zones are numbered from
1–5 according to increasing intensity.
The Forerunner sets the heart rate
zone ranges (see the table on page
45) based on your maximum and
resting heart rates set in your user
prole (see page 29).
You can also customize your heart
rate zones in your user prole of
Garmin Connect or Garmin Training
Center. After customizing your heart
rate zones, transfer data to your
Forerunner.