V= D/t wrote:
Yawn. 2.7 % better efficiency, whatever that means. If it was really a 2.7 % increase in speed/decrease in time, that would mean about a 3:20 min gain for a 2:03/2:04 marathon runner. Where are all the 1:59-2:00 runners now?
I think it might be more like a 1-2 min improvement at best, if you look at actual performances. However, good enough for Kipchoge to better the WR he was chasing for years, but it won't make a 2:20 runner elite, nor does it really matter if your average hobby jogger runs 4:12 instead of 4:15.
Number refers to efficiency, if I read the article correctly- NOT speed- i.e. can't just drop 2.7% from a specific time.
In that article the authors suggest that at marathon pace you pretty much can. At "slow" paces like marathon pace the relationship between aerobic power, efficiency and pace is nearly linear so a small improvement in power or efficiency corresponds roughly to the same percent improvement in the pace.