I was thinking about that phenomenon today during my Z3 intervals. I ran a little hill (55m) 9 times and hiked down as active recovery. What I observed:
I was hiking down, reached the bottom, turned around and the first let’s say one minute my legs burned. After the minute the burn was gone.
My hypothesis is that my FT fibres are either recovered or recruited (by the force impact of the donwhill hike -> central governor theory). So, when I turn around and run/walk uphill again, the FT muscles are still recruited which stresses my cardiac system and results in the leg burn.
Then after the minute (or couple minutes when intensity is higher) the FT fibres are either exhausted, or the central governor is realizing that the FT fibres don’t need ro be recruited.
What do you think?
Best regards
Dada