RS800CX

To help you train safely and effectively, the training computer determines your heart rate target zone limits automatically according to your age-based maximum heart rate (220 minus age). The limits are determined either in beats per minute (bpm), as a percentage (%) of your maximum heart rate, or as a heart rate reserve (% HRR), meaning the difference between your resting heart rate and maximum heart rate (HRR = HRmax - HRrest). See also Manual target zone.

Heart rate is the measurement of the work your heart does. Heart rate can be expressed as the number of beats per minute (bpm) or as a percentage (%) of your maximum heart rate or as a percentage of your heart rate reserve (% HRR), meaning the difference between your resting heart rate and maximum heart rate (HRR = HRmax - HRrest).

This feature enables you to define the target zone as you want and is suitable for your training. You can set the target zone for your training as beats per minute (bpm), as a percentage (%) of your maximum heart rate, or as a percentage of your heart rate reserve (HRR%).

Polar OwnCal calculates the number of kilocalories expended during training. This feature allows you to follow the kilocalories expended during one training session and cumulative kilocalories expended during several training sessions. The effect of the ambient air pressure is taken into account in the calorie expenditure calculations: in moderate and high altitude there is less oxygen in the air so you can do less work and expend fewer calories at the same heart rate.