POLAR RS 800 SD - Manual (Page 14)

OwmOptimizer™
Successful training requires temporary overloading: longer exercise
duration, higher intensity and frequency, or higher total volume. However,
if you overload too much the effect to overall performance gains can be
negative. To avoid this, overloading must always be followed by an
adequate recovery period.
Polar OwnOptimizer measures heart rate and beat to beat variability
during a simple orthostatic (laying down to standing) test. In this way
it is able to identify the level of your training status and recovery, helping
you to obtain optimal longer term performance benefits by ensuring you
don’t over or under train.
OwnOptimizer values range from 1 (Good Recovery) to 9 (Parasympathetic
Overtraining). Using OwnOptimizer minimizes the risk of negative
progression through excessive overtraining.
By testing yourself in the morning after a training session and after recovery days you
are able to determine your level of recovery and adjust training intensities accordingly
OwnOptimizer reading
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*HEART RATE VARIABILITY