There are three main energy systems that provide fuel for muscle. Two of these are anaerobic (literally, without oxygen), and the third is aerobic (with air or oxygen).
The final product used by each of these three systems is the high-energy molecule adenosine triphosphate (ATP) which, when split, provides energy for the muscles to contract. For those
Studying exercise performance, it’s the outcomes of these energy systems, particularly muscular contraction, and the types of exercises which improve them, which are important.
The energy systems in relation to exercise have been covered in much more detail elsewhere, and so muscle physiology will only be considered in summary form here. We will then look at the metabolic pathways that provide the options for fuel for muscle. The implications of these for exercise planning for fat loss will be considered in detail. These pathways are complicated and much information is still to be learned from research in this area, but the following will provide an introduction for an understanding of the fat-burning process in humans.
Myth-information. Sit-ups to reduce abdominal fatness will result only in a “tight’ fat waist instead of a ‘loose’ fat waist. Sit-ups can tone muscle but will have little effect on the subcutaneous fat overlaying this muscle.
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