noun
fast-twitch muscle fiber; fast muscle fiber
Anatomical term for muscle fibers that contract quickly and are used for explosive movements.
速筋線維は短距離走に重要です。
Fast-twitch muscle fibers are important for sprinting.
Slow-twitch muscle fiber; used for endurance activities, contrasting with 速筋線維 which is for quick, powerful movements.
Compound of 速 (fast), 筋 (muscle), and 線維 (fiber). A straightforward technical term.