L1__Introduction to Muscles(Types)

According to the contraction speed and ability of muscle fibers, skeletal muscles can be divided into slow muscle fibers (Type I) and fast muscle fibers (Type II).

Slow muscle fibers are rich in mitochondria and can continuously produce energy, making them suitable for endurance sports such as long-distance running, swimming, and aerobic exercise. Slow muscle fibers have a slower contraction rate, but can work continuously for a longer period of time, making them suitable for long-term low-intensity exercise. Stimulating and training slow muscle fibers can be achieved through long-term aerobic exercise such as jogging, swimming, and cycling.

Fast muscle fibers are divided into two types:

fast muscle fiber type A (Type IIa) and fast muscle fiber type B (Type IIb or IIx). Fast muscle fiber type A has certain endurance and strength, suitable for moderate intensity exercise such as fast running and weightlifting.

Fast muscle fiber type B has high strength and explosiveness, but fatigue is fast, making it suitable for high-intensity, short-term explosive sports such as sprinting and jumping. Stimulating and training fast muscle fibers can be achieved through high-intensity strength training and explosive exercises such as weightlifting and sprinting training.

That's the basic classification of muscle.

Sources Cited:

Sport Science Insider. "Muscle Fibers Explained: Type I and Type II (Slow & Fast Twitch)." Sport Science Insider, 2023, sportscienceinsider.com/muscle-fibers-explained-type-i-and-type-ii-slow-fast-twitch.

OpenStax Anatomy & Physiology. "10.5 Types of Muscle Fibers." OpenStax, Oregon State University, 2023, open.oregonstate.education/aandp/chapter/types-of-muscle-fibers/.