POLAR M21 - Manual (Page 27)

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Heart rate limits for your previously determined
OwnZone appear on the display.
2. Stop the stopwatch by pressing START/STOP/OK.
QUIT? appears in the display.
3. To reset the stopwatch press and hold
SCROLL DOWN.
The stopwatch will start blinking and RESET? text
appears in the display.
To reset the stopwatch keep pressing
SCROLL DOWN.
4. To restart the stopwatch press START/STOP/OK.
O W N Z O N E M E T H O D S
Polar Heart Rate Monitor uses multiple methods for
determining your OwnZone. The primary method is based
on measuring and analysing the heart rate variability
during graded exercise (OZ.V).
If your heart rate exceeds the safety limit during the
determination, Polar Heart Rate Monitor picks up your
latest OwnZone definition based on heart rate variability
(OZ.L). Alternatively, if there is no previous determination
in memory, OwnZone limits, which are based on your age
predicted maximum heart rate (OZ.A), will be used. These
methods ensure that the safest possible exercise zone is
determined for you.
The method used in defining the OwnZone is indicated
after the two beeps as follows:
1. OZ.V (OwnZone Variability) and the currently
determined OwnZone limits appear on the
illuminated display.
2. OZ.L (OwnZone Latest) and your previously
determined OwnZone limits appear on the
illuminated display.
3. OZ.A (OwnZone Age) and your age-predicted
heart rate limits appear on the illuminated display.
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