Originally Posted by
kcjc
Efficiency Factor (EF) measures aerobic fitness by dividing Normalized Power (NP) by average heart rate (EF = NP / avg HR). Since it's NP, wouldn't it depends on the workout's intensity, with a cap on duration on both the upper and lower range since it's HR, and compared accordingly? For me, it's like HR drift, useful but too narrow in application.
That's interesting. I don't pay much attention to HR measures so I didn't know that EF was NP/HR. However, Terry's charts were either HR vs. power (so I presumed avg HR vs. avg power) or % threshold HR vs. (avg?) power.
Since EF uses NP in the numerator, shouldn't it use something like TRIMP in the denominator?