Polar Electro S725, User Manual

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If you want to improve your cardiovascular fitness, it takes a minimum of
6 weeks on an average to see a noticeable change in OwnIndex. Less fit
individuals see progress even more rapidly and for more fit individuals
more time is needed.
Cardiovascular fitness is best improved by exercise types which employ
large muscle groups. Such activities include running, swimming, rowing,
skating, cross-country skiing, cycling and walking.
To monitor your fitness progress start with measuring your OwnIndex a
couple of times during the first two weeks, to get a baseline value.
Thereafter, repeat the test approximately once a month.
OwnIndex is based on resting heart rate, heart rate variability at rest, age,
gender, height, body weight and self-assessed physical activity.