Im attempting a proper winter base of running for the first time so was calculating an appropriate HR to stay beneath. I had previously used Coggan’s Zone Calculator so used this and then cross referenced with Joe Friels Training Bible. The results for lower end zones are markedly different and have left me really confused!
Average HR for recent 20minute test - 184bpm
Estimate Heart Rate Threshold 184bpm - 5% = 175bpm
Coggan - below 119bpm Friel - below 142bpm
ENDURANCE / AEROBIC
Coggan - 120-145bpm Friel - 143-154bpm
Where on earth should I pitch base with this level of professional variance?