Do metabolic “thresholds”/ sudden breakpoints exist? Is there an on/off switch in glycolysis or the LD enzyme? Is there an on/off switch on La diffusion or a “passage” from aerobic to anaerobic metabolism in the muscle fiber? Is this what blood La behaviour tells us?
The term “threshold” was first used to denote the “onset of anaerobic metabolism”(1964, 1973) due to inadequate O2 supply (a passage from aerobic to anaerobic metabolism).
