NUTR3000 Study Guide - Quiz Guide: Square Enix Europe, Vo2 Max, Exercise Intensity

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28 Sep 2018
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Exercise intensity will affect the mix of fat and glycogen. Low intensity exercise > burning predominately fat rather than glycogen. Moderate/high intensity exercise > muscle glycogen makes a greater contribution. If the muscle can use more fat, especially during the early stages of exercise, this may spare the muscle glycogen and delay the onset of fatigue. Caffeine mobilises fat use during exercise and delays the onset of fatigue. Caffeine promotes release of free fatty acids (ffa) via an increased sympatho-adreno response and that exercise capacity was improved. Taking caffeine an hour or so before exercise, you would mobilise the fat. Muscles would then use the fat and spare the glycogen. Caffeine causes the sympatho-adreno response which releases free fatty acids to the blood. New study: caffeine improves performance, but not via the release of fat into the blood. The reason: exercise events which are relatively brief can be improved following caffeine intake.

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