Originally Posted by
rubiksoval
That's been the traditional thinking. That's why Gastin's work was so interesting. It showed that aerobic changeover happening substantially earlier than anyone else believed. Maybe it's not 40. Maybe it's 45 or 50. I was going off memory.
Ah, 46 + / -4%. for 400m, which is around 43-44 seconds. So about 45-50 seconds for majority work.
Here's an old thread. Some links are dead, but maybe that can lead you to the original study if interested.
https://www.letsrun.com/forum/flat_r...?thread=927991
In any case, despite all the minutiae, it's not 5 minutes. And it's apparently not 1:20, either.
So much aerobic need for even short durations, which was the point all along.
The study I posted was from the same year as that thread (and newer than the Gastin study), and was almost identical (59% anaerobic vs 57% for the 400m which is longer than 40 seconds) with the numbers in the OP. In fact, it is posted on that very thread further down. Based on the numbers from either study, it's highly unlikely that the total anaerobic contribution drops below 50% before a minute.
Edit to add: also, the average 400m time in the study I posted was 52 seconds. So, at 52 seconds, 59% of the work was still anaerobic.