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your heart rate zones in comparison to your normal level.
Benefits of the ZoneOptimizer feature
Each Sport Zone has a different physiological response which is described briefly in the Polar Sport Zones
(page 40). The ZoneOptimizer measurement takes your personal information, including your heart rate
variability, into account and personalizes your sport zones before every training session.
ZoneOptimizer measurement
Polar ZoneOptimizer recommends lower intensity training when little heart rate variability is detected and
higher intensity training, when plenty of heart rate variability is detected at a given heart rate. It also gives
you feedback if your current limits are higher, normal or lower than your normal level, when compared to
your earlier measurements. You may get feedback on your daily physiological status by paying attention to
how fast and how easily you can do training at the recommended heart rates.
Polar ZoneOptimizer determination is done in three phases and will be completed when 10 minutes of
determination at maximum is reached.
Action Heart rate in beats per
minute
Duration How to achieve
Keep your heart rate
between 70 and 100
beats per minute.
70 - 100 bpm Minimum of 2 minutes Standing or training
with very light training
intensity, for example,
walking slowly.
Increase heart rate
gradually from 100 to
130 beats per minute
within two minutes.
100 - 130 bpm Minimum of 2 minutes Walking briskly or
cycling/ jogging at low
intensity during warm
up.
Gradually increase your
heart rate above 130
beats per minute.
130 bpm < Minimum of 30
seconds, 6 minutes at
maximum
Gradually increasing
heart rate and
continuing as planned.
Measurement phases
1. Preparing for training session: Lots of heart rate variability. Because at this stage there is still a lot of
heart rate variability, it’s easy to detect daily changes. In absolute figures this means heart rates from 70
to 100 beats per minute.
2. Warming up: heart rate rises slowly and heart rate variability decreases. During this phase heart rate
variability starts decreasing, and the body prepares for higher intensities. In absolute figures this means
heart rates from 100 to 130 beats per minute.
3. Heart rate variability levels off. After this phase heart rate variability stays at a very low level or almost
disappears. This usually takes place at around 130 beats per minute and higher. All Zone limits are
updated after heart rate has been continuously, for at least 30 seconds, above the upper limit of Phase2
(130 beats pre minute / 75% of HR
max
).
ZoneOptimizer guidance normally uses absolute figures (70-100-130 beats per minute), but the two
uppermost figures change if personal HR
max
is very low. The second phase upper limit, which is normally
130 beats per minute, is limited not to exceed 75% of HR
max
. This is done automatically without actions
from you.
ZoneOptimizer allows different durations of Phase1 (preparing for training session, heart rate in between
70-100 beats per minute) and Phase2 (warming up, heart rate in between 100-130 beats per minute).
The recommended minimum durations to get the limits successfully determined are 2 minutes at Phase1,
2 minutes at Phase2 and half a minute or six minutes at maximum in Phase3.
ZoneOptimizer function is developed for the use of healthy people. Some health conditions may cause heart rate
variability-based ZoneOptimizer determination to fail or give lower intensity targets. These conditions include high
blood pressure, cardiac arrhythmia, and certain medications.
ENGLISH
42 Background Information
42


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