ANATOMY

Detailed explanation-1: -Slow oxidative (SO) fibers contract relatively slowly and use aerobic respiration (oxygen and glucose) to produce ATP. Fast oxidative (FO) fibers have fast contractions and primarily use aerobic respiration, but because they may switch to anaerobic respiration (glycolysis), can fatigue more quickly than SO fibers.

Detailed explanation-2: -Slow-twitch fibers rely on aerobic respiration to fuel muscle contractions and are ideal for long term endurance. Fast-twitch fibers rely on anaerobic respiration to fuel muscle contractions and are ideal for quick contractions of short duration.

Detailed explanation-3: -When you do aerobic endurance activities–think long-distance running, cycling and swimming–you’re relying on slow-twitch muscles.

Detailed explanation-4: -Slow-twitch muscle fibers use an aerobic energy system. This means that they run on oxygen. Fast-twitch muscles mainly run on an energy system that doesn’t need oxygen. This is called an anaerobic energy system.

Detailed explanation-5: -Fast oxidative (also called fast twitch or Type IIa) fibers have relatively fast contractions and primarily use aerobic respiration to generate ATP.