POLAR M21 - Manual (Page 52)

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POLAR GLOSSARY
Indicates coded transmission of heart rate. The inner
heart flashes to the beat of your heart.
In the Time of day mode indicates that the alarm is on.
In the measure mode indicates that the sound signal will
alarm if you are exercising outside your Target Zone.
Progress bullets in the measure mode.
In models M21 and M22 one bullet= 100 kcal energy
expenditure. In models M51 and M52 one bullet= 10
minutes in target zone.
AGE: Insert your age in User settings.
ALARM: Indicates the alarm clock in watch settings.
AM/PM: 12 hour mode of time.
AVERAGE Hr: Average heart rate of the exercise.
Coded heart rate transmission: Polar coded transmitter
automatically locks in a code to transmit your heart rate to
your wrist receiver. In coded transmission the receiver
accepts heart rate from your Polar coded transmitter only.
Coding significantly reduces crosstalk caused by other users
of heart rate monitors. However, it does not necessarily
reduce all environmental interference.
Electrodes: The grooved areas of the transmitter, against
the skin. Pick up the heart’s electrical impulses.
EXERCISE: Heart rate measurement mode, stopwatch is on
and the exercise information is recorded.
EXE. TIME: Total exercise time.
FAT: Indicates the fat percentage of the total calorie
expenditure.
FILE: File mode to recall training information.
Heart rate: The number of heart beats per minute (bpm)
Heart rate variability: Fluctuations of interbeat intervals.
Heart rate variability of a healthy subject is in general large
in resting conditions and during light exercise. Heart rate
variability gradually disappears when exercise becomes
more intense and heart rate increases.
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