When a muscle is exercised, lactic acid is formed in the muscle, and that is what makes the muscle feel tired. With a short rest, the lactic acid is carried away by the blood stream and the tired feeling goes away.
Accumulation of lactic acid in the muscle from anaerobic ATP production.
Lactic acid is a byproduct of muscular over exertion.
Lactic acid (muscular acidification)
Swimming, running, and basketball use the lactic acid system.
The anaerobic energy system produces lactic acid. This system is used for high-intensity activities where the body cannot supply enough oxygen to the muscles. Lactic acid is produced as a byproduct when glucose is broken down for energy without the presence of oxygen.
Exercise induces the lack of oxygen that causes the waste buildup known as lactic acid.
running
The limiting factor of the anaerobic lactic energy system is the accumulation of lactic acid in the muscles. As the intensity of exercise increases, the body produces lactic acid faster than it can be cleared, leading to muscle fatigue and a decrease in performance.
The skeletal system itself does not directly remove lactic acid; instead, lactic acid is primarily processed by the liver and muscles. During intense exercise, lactic acid is produced as a byproduct of anaerobic metabolism. While the skeletal muscles can utilize lactic acid for energy, the liver converts it back into glucose through a process called gluconeogenesis. Thus, the skeletal system plays a role in the overall metabolism of lactic acid, but it does not remove it on its own.
Most team games use the lactic acid system. However, this is more common in Invasion games.
Lactate (also known as lactic acid) and NAD+
The lactic acid energy system relies on the breakdown of glycogen to produce energy. As it does not require oxygen to break down glycogen a by-product called lactic acid is formed. If enough lactic acid is accumulated then the body begins to fatigue. To recover, the lactic acid requires oxygen. Once oxgen is present the lactic acid can be converted back to pyruvic acid which can once again be used to produce energy. Therefore to speed up recovery of the lactic system an "active"recovery at a low intencity is recommended. This then employs the use of the aerobic energy system which requires oxygen to be transported to the working muscles, and at the same time removing the fatiguing lactic acid.