3 ms·
In this case, is the body releasing actual fat into the bloodstream for use by the muscles, rather than the fat stores burning fat directly for ATP?
by mmastrac 4y ago
In this case, is the body releasing actual fat into the bloodstream for use by the muscles, rather than the fat stores burning fat directly for ATP?
- cowmoo728 4y agoYes, fatty acids are bound up in TriAcylGlycerol (TAG). Exercise triggers the breakdown of TAG in fat reserves, sending fatty acids into the blood. These fatty acids go through a pretty complicated process to be delivered into a muscle cell, and then into the muscle cell mitochondria. This transport process cannot keep up with energy expenditure during intense exercise, thus the cutover to stored muscle glycogen (and at even higher peak loads under about 10 seconds, creatine phosphate). Sedentary people lose the ability to rapidly deliver fat into muscle cell mitochondria. This is a good summary of the current state of the research. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5766985/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5766985/
- robbintt 4y agoWhat is meant by intense exercise? For example, vigorous cardio (age dependent but about hr 150 bpm) is one familiar benchmark, but is this considered intense exercise?
- deleted 4y ago[deleted]