<![CDATA[Understanding how the body produces and utilizes energy during exercise is key to enhancing athletic performance and refining training strategies. This systematic review analyzes recent studies on the contributions of the phosphagen (ATP-PCr), glycolytic (anaerobic), and oxidative (aerobic) energy systems in various sports. The review follows PRISMA 2020 guidelines and includes studies published between 2020 and 2025, selected from Scopus, PubMed, Google Scholar, and Web of Science. Energy system contributions were evaluated using markers such as oxygen uptake, substrate utilization, blood lactate levels, and ATP turnover rates. The review finds that in high-intensity, short-duration events like the 100m sprint, the phosphagen system accounts for 70%, while glycolytic and oxidative systems contribute 25% and 5%, respectively. In endurance events such as marathons, oxidative metabolism dominates, contributing 85–95% of total energy. Sports with mixed intensity, such as soccer and basketball, show dynamic contributions, with oxidative metabolism at 50–60%, phosphagen at 20–30%, and glycolytic at 15–25%. These results highlight the importance of sport-specific training to optimize energy system interactions and performance.]]>
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