has subject area Anatomy, Cross-Sectional Animals Body Weight Electron Transport Electron Transport Complex IV Female Male Mitochondria, Muscle Muscle Fibers, Fast-Twitch Muscle Fibers, Slow-Twitch Muscle, Skeletal Muscular Atrophy Organ Size Rats Rats, Inbred BN Rats, Inbred F344 Succinate Dehydrogenase