https://www.inkling.com/read/textboo...84/figure-84-4
i cant copy the chart here, but if you follow the link, the chart shows that as exercise progresses, glycogen stores decrease, and the percentage of fat usage is increased.
it helps to explain why people believe that fasted and pwo cardio is better. the reasoning is not that glycogen stores are completely depleted at those times. as the glycogen stores decrease, fat usage increase. it does not need to be completely depleted for the statement to be true.
i am aware that there is a recent study done to show that fat usage during fasted cardio is more than fat usage during fed cardio only after 2 hrs of exercise. but i am not sure if that result has been repeated by other researchers or if the conclusion is correctly drawn from the study design. but it seems like that study and its conclusion has not made it into Physiology textbooks yet.
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