Polar CS600X Heart Rate Value in a Sitting Position, Heart Rate Reserve, Heart Rate Variability

Polar CS600X User Manual 50

heart rate, you can safely take a test to determine your HRmax yourself. Having a training buddy during the test is recommended. If you are uncertain, consult your physician before undertaking the test.

Here is an example of a simple test.

Step 1: Warm up for 20 minutes on a flat surface, building up to your usual training pace.

Step 2: Choose a hill that will take more than 2 minutes to climb. Cycle up the hill once, building to as hard a pace as you can hold for 20 minutes. Return to the base of the hill.

Step 3: Cycle up the hill again, building towards a pace you could just about hold for 10 minutes. Note your highest heart rate. Your maximum is approximately 10 beats higher than the noted value.

Step 4: Cycle back down the hill, allowing your heart rate to drop 30-40 beats per minute.

Step 5: Cycle up the hill once again at a pace that you can only hold for 1 minute. Try to cycle halfway up the hills. Note your highest heart rate. This brings you close to your maximum heart rate. Use this value as your maximum heart rate to set training zones.

Step 6: Make sure you get a good cool-down, a minimum of 15 minutes.

Heart Rate Value in a Sitting Position

HRsit is your average heart rate when completely still (i.e. while sitting). To easily determine HRsit, 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 (HRmax), and resting heart rate (HRrest)*. 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 (VO2R).

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 (HRmax – HRrest) + HRrest

Example:

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 CS600X cycling computer, 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.