User Manual

HEART RATE VALUE IN A SITTING POSITION
HR
sit
is your average heart rate when completely still (i.e. while sitting). To easily determine HR
sit
, wear your transmitter,
sit down, and do not engage in any physical activity. For a more precise measurement, repeat the procedure several times
and calculate your average.
HEART RATE RESERVE
Heart rate reserve (HRR) is the difference between maximum heart rate (HR
max
), and resting heart rate (HR
rest
)*. HRR is
used to calculate exercise heart rates. It is the range within which heart rate varies depending on exertion level. HRR
equals oxygen uptake reserve (VO
2
R).
Exercise heart rate can be determined by using the Karvonen formula**. Add the given percentage of heart rate reserve to
resting heart rate.
Exercise HR = % of target intensity (HR
max
– HR
rest
) + HR
rest
Example:
Target intensity 70 % HRR for a person with HR
max
201 bpm and HR
rest
50 bpm
Exercise HR= 70% (201-50) + 50
Exercise HR=156 bpm
For a precise exercise heart rate, you need your exact HR
max
and HR
rest
. When using estimated HR
max
, exercise heart
rate values are always estimates.
*In Polar CS400 and CS600 cycling computers, the heart rate value during a resting state is measured in a sitting position
(HR
sit
). This is for practical reasons since HR
sit
is used in energy expenditure calculation because of accuracy. HR
sit
matches the low intensity to which different exercise intensities can be compared.
**Karvonen M, Kentala K, Mustala O. The effects of training on heart rate: a longitudinal study. Ann Med Exp Biol Fenn
1957; 35: 307-315.
HEART RATE VARIABILITY
Heart rate varies with every heartbeat. Heart rate variability (HRV) is the variation of beat-to-beat intervals, also known as
R-R intervals.
Pa
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