Editing Aerobic exercise (section)

=== Fuel usage ===
Depending on the intensity of exercise, the body preferentially utilizes certain fuel forms to meet energy demands. The two main fuel sources for aerobic exercise in the body include [[fat]] (in the form of [[adipose tissue]]) and [[glycogen]]. Amino acids can also be used as a fuel source during aerobic exercise, however in moderate proportions (around 3% of the total energy expenditure during exercise<ref>Clauss, M., & Jensen, J. (2025). Effect of exercise intensity, duration, and volume on protein oxidation during endurance exercise in humans: A systematic review with meta-analysis. Scandinavian Journal of Medicine & Science in Sports, 35(4): e70038. https://doi.org/10.1111/sms.70038</ref>). At lower intensity aerobic exercise, the body preferentially uses fat as its main fuel source for [[cellular respiration]], however as intensity increases the body preferentially uses [[glycogen]] stored in the muscles and liver or other carbohydrates, as it is a quicker source of energy.<ref>{{cite journal | vauthors = Murray B, Rosenbloom C | title = Fundamentals of glycogen metabolism for coaches and athletes | journal = Nutrition Reviews | volume = 76 | issue = 4 | pages = 243–259 | date = April 2018 | pmid = 29444266 | pmc = 6019055 | doi = 10.1093/nutrit/nuy001 }}</ref> Aerobic exercise at low or moderate intensity is not a very efficient way to lose fat in comparison to high intensity aerobic exercise. Lipolysis (hydrolysis of triglyceride into fatty acids),<ref>{{Cite journal |last1=Merrick |first1=David |last2=Seale |first2=Patrick |date=June 2020 |title=Skinny Fat Cells Stimulate Wound Healing |journal=Cell Stem Cell |volume=26 |issue=6 |pages=801–803 |doi=10.1016/j.stem.2020.04.021 |issn=1934-5909|doi-access=free |pmid=32502400 }}</ref> not fat burning (conversion of fatty acid to carbon dioxide), explains the intensity-dependent fat mass reduction. It has been shown that fatty acid is consumed for wound healing, where moderate intensity exercise does not produce significant damage like high intensity exercise. The size of adipose tissue is determined by the magnitude of nutrient competition from muscle and lungs for cell regeneration and energy replenishment after exercise.<ref>{{cite journal | vauthors = Harris MB, Kuo CH | title = Scientific Challenges on Theory of Fat Burning by Exercise | journal = Frontiers in Physiology | volume = 12 | pages = 685166 | date = 2021 | pmid = 34295263 | pmc = 8290478 | doi = 10.3389/fphys.2021.685166 | doi-access = free }}</ref>{{Failed verification|date=October 2023}}