Slow-Twitch Muscle Fiber

**Semantic type:** Cell

**Definition:** A skeletal muscle fiber that utilizes aerobic respiration to fuel muscle contraction. Slow twitch muscle fibers, which have a high concentration of myoglobin and mitochondrial oxidative enzymes, are resistant to fatigue.

**Synonyms:** - Muscle Fiber, Slow-Twitch - Type I Muscle Fiber - Type I Skeletal Muscle Fiber