Operation Manual

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Check your heart rate
Heart-rate zones help you target the training intensity of your choice. Ionic shows
your current zone and progress toward your maximum heart rate next to your heart-
rate reading. On your Fitbit dashboard, you can see your time spent in zones during
a particular day or exercise. Three zones based on American Heart Association
recommendations are available by default, or you can create a custom zone if you
have a specific heart rate you’re targeting.
Default heart-rate zones
Default heart-rate zones are calculated using your estimated maximum heart rate.
Fitbit calculates your maximum heart rate with the common formula of 220 minus
your age.
Icon
Zone
Calculation
Description
Out of Zone
Below 50% of your
maximum heart
rate.
Your heart rate
may be elevated
but not enough to
be considered
exercise.
Fat Burn
Between 50% and
69% of your
maximum heart
rate.
Low-to-medium
intensity exercise
zone. This zone
may be a good
place to start for
those new to
exercise. It’s called
the Fat Burn zone
because a higher
percentage of
calories are burned
from fat, but the
total calorie burn
rate is lower.
Cardio
Between 70% and
84% of maximum
heart rate.
Medium-to-high
intensity exercise
zone. In this zone
you’re pushing
yourself but not
straining. For most
people this is the
exercise zone to
target.