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That's a wealth of knowledge now I need to process and studyHaha, sorry about that
I do believe that a solid aerobic base is required for (i) a longer period of peak performance in your periodisation and (ii) to better recover from streneous high-intensity interval sessions.
High metabolic activity in the muscle at rest (during static and you could say to some extent during free immersion) would not be expected to improve performance, would it (higher O2 consumption at rest is not what you want as a freediver)?
That being sad, note that high-intensity interval training also increases muscle capillarization and mitochondrial content - but it is reasonable to postulate that it superiorly increases your pH-handling capacity as well as the capacity to yield ATP in hypoxic conditions ('anaerobic' glycolysis) as compared to moderate-intensity endurance training.
A logical suggestion would be to work on a good aerobic base in the beginning of the season and then start training at high intensities (either or not whilst holding your breath). But there are other more experienced people who might give you a better answer to your question...
Cheers
Does increased muscle capillarization and mitochondrial enzymes hinder freediving performance? It is adaptations that runners cyclists etc have.