This is a tiny bit subjective unless you know your anaerobic threshold HR, Max HR and VO2 max...
The traditional formulae don't always hit this, and testing works best......unless you are a cyclist, this is usally done on a treadmill (the test)
So that said, if you feel that you are aerobic, say in the 110-130 range..then it would take momentary bursts near 100% output, and your HR may or may not climb to 150-160 plus..this is age dependant among other things.
So 20-50 beats.....would be considered "Higher Intensity:, but a "Preceived Effort" of 95-100% for 45-60 seconds would be a better measure...as your HR will/may not top that, in that short of time!
DP



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