Heart rate variability, Polar article library, Customer service information – POLAR CS400 User Manual
Page 39: Care and maintenance, Caring of your product
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.
HRV indicates the fluctuations of heart rate around an average heart rate. An average heart rate of 60
beats per minute (bpm) does not mean that the interval between successive heartbeats would be
exactly 1.0 sec, instead they may fluctuate/vary from 0.5 sec up to 2.0 sec.
HRV is affected by aerobic fitness. HRV of a well-conditioned heart is generally large at rest. Other
factors that affect HRV are age, genetics, body position, time of day, and health status. During
exercise, HRV decreases as heart rate and exercise intensity increase. HRV also decreases during
periods of mental stress.
HRV is regulated by the autonomic nervous system. Parasympathetic activity decreases heart rate and
increases HRV, whereas sympathetic activity increases heart rate and decreases HRV.
HRV is used in the Ownzone and OwnIndex features.
Polar Article Library
For more facts and know-how to enhance your cycling, visit [http://articles.polar.fi/en/1_segment.html].
1 1 . C U S T O M E R S E R V I C E I N F O R M AT I O N
Care and Maintenance
Caring of Your Product
Like any electronic device, the Polar cycling computer should be treated with care. The suggestions
below will help you fulfill guarantee obligations and enjoy this product for many years to come.
Detach the transmitter connector from the strap after use. Clean the connector with a mild soap and
Polar CS400 User Manual
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