Musclechemistry Board Certified Member
Muscles are made up of long cells known as muscle fibers, innervated by a nerve cell (neuron) which stimulates the muscle to contract. Stimulating the right type of muscle fiber can impact your physique!
One nerve cell can stimulate many muscle fibers to contract at once, known as a motor unit. A small motor unit is a neuron which innervates just a few muscle fibers, while a large motor unit innervates many muscle fibers.
Muscle fibers themselves differ as well in that some are more durable but less powerful (slow twitch) while others are more powerful but less durable (fast twitch).
1. Slow twitch fibers (type 1)
2. Fast twitch OXIDATIVE fibers (type 2A).
3. Fast twitch GLYCOLYTIC fibers (type 2X aka 2B aka 2D).