Heart Rate Zones

Target heart rate zones I have found vary from source to source, but all of them seem to have a 10% spread above 50% HR_max there are also two different methods that I found for determining your target heart rate.

The Zoldaz Method
THR = HR_max - Adjuster +/- 5 bpm

where the adjuster determines the heart rate target zone as below.

Zone 1 = 50 bpm
Zone 2 = 40 bpm
Zone 3 = 30 bpm
Zone 4 = 20 bpm
Zone 5 = 10 bpm

this obviously is not a very good method of determining target zones, as it does not count for general fitness or age etc.

The Karvonen Method

this method takes into account a persons resting heart rate and has a % intensity multiplier (a much better method of calculating zone)

THR = ((HR_max - HR_rest) x % intensity) + HR_rest

This is the method that I shall use and later I will calculate my heart rates based on this method.