[fpernett]

This Eric theory make a lot of sense to me.
I decide to listen my brother, on how to make the beath-up for a max static, this is the pattern:
6 min breath-up
Doing some packs every minute or 30 secs (for me 6-10)
Stop packing for the last 2 min of breath-up
Maximal performance (without packing) no special numbers, just until you can't hold it anymore.
8 min breathe-up (without packing)
Final attempt after full packing
With this method I could get my PB in the first attempt and improve it in the final.
I think this is related not only with pH but also with O2 stores.
In the CO2 movement we have to take into account that after a extreme breath-hold the venous CO2 is very low, the build-up during the apnea remain local (cell), after some minutes it start to be released to the circulation. If we remember and old study in AMA divers, the etCO2 was very low inmediatly after the dive.
I think we are still far to found "the key" but I love to see people like Eric, that is always looking for answers.