Polar CS400 user manual U S T O M E R S E R V I C E I N F O R M At I O N, Heart Rate Variability

Polar CS400 User Manual 39

Target intensity 70 % HRR for a person with HRmax 201 bpm and HRrest 50 bpm

Exercise HR= 70% (201-50) + 50

Exercise HR=156 bpm

For a precise exercise heart rate, you need your exact HRmax and HRrest. When using estimated HRmax, 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 (HRsit). This is for practical reasons since HRsit is used in energy expenditure calculation because of accuracy. HRsit 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 Polar Article Library [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