Which are characteristics of glycolytic fibers?

Glycolytic fibers, also known as fast-twitch fibers or Type IIb fibers, primarily rely on anaerobic metabolism for energy, allowing for rapid and powerful contractions. They have a high concentration of glycogen and enzymes for glycolysis, enabling quick energy release, but they fatigue quickly due to lactic acid accumulation. These fibers are typically larger in diameter and have fewer mitochondria compared to oxidative fibers, making them less efficient for prolonged activities but ideal for short bursts of high-intensity exercise.