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This is interesting also. Do you have any good links?
I reckon that I've experienced low GI a heap of times during workouts - based on the way my thinking/focus deteriorates.
But yeah. I don't think there's been a correlation to me between low GI and nausea.
But lactic acid build-up makes sense.
Don't know about lactic acid relating to "burn" though. It's been over a decade since I went for a "burn" activity-wise. But... my recollection is that not only does the muscle feel hot mentally, but it is actually extremely hot to touch. Much more than during a "pump" experience or normal training set.
Based on that - it seemed to me more that the "burn" most likely arisese from the energy consumption (exothermic reactions) during activity itself, not so much from the by-products.
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