Originally Posted by
JimboMartin
The metabolic cost of eccentric cycling is very low. Like 1/5th what you would expect for regular concentric cycling.
I'd like to see some evidence for that.
It is extremely unlikely that anyone can produce 900 watts for 20 minutes: it would require 10 watts per kg from a 90 kg individual. Even for elite XC skiiers, who have the highest aerobic capacities of any sport, 7 watts / kg is the accepted limit for those not relying on "assistance".
Also, since the accepted figure for aerobic conversion in cycling is about 0.22 , for your process to be 5 times as efficient would result in a conversion > 1, obviously impossible.