- muscle fibers, intermediate
- muscle fibers, slow-twitch
- skeletal muscle fiber, type I
- Skeletal muscle fibers having low myofibrillar ATPase activity, low glycogen content, and high myoglobin content, high mitochondrial oxidative enzyme activities, and an intermediate mitochondrial content which produce a slow twitch and are fatigue-resistant.
Definition from: NCI Thesaurus via Unified Medical Language System at the National Library of Medicine
See also Understanding Medical Terminology.