The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
if your demand for ATP is incredibly quick usually exceeding the capacity of oxygen to get into the cell you'll make lactate and that's also relatively inefficient meaning you don't get that much more ATP I think you get another two molecules of ATP per unit of pyruvate
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if oxygen is scarce relative to ATP demand you can take a inefficient route but at least you guarantee to get some ATP which is you can turn the pyruvate into lactate and lactate itself is interesting and maybe we can talk about it but you generate some ATP
It's interesting because lactate also is much like ketone bodies, energetically thermodynamically favorable. So it takes less energy to make energy. Yeah. So you're consuming less oxygen because you don't need as many ATP molecules to make ATP.