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Lean Muscle Mass. Lean muscle is a concept related to lean body mass, which is the content of the body minus fat. Lean body mass is used to calculate basal metabolic rate.Lean muscle is less of a scientific term and more a term of art that refers to muscle that is independent of, and not obscured by, fat.ean Muscle Mass. Lean muscle is a concept related to lean body mass, which is the content of the body minus fat. Lean body mass is used to calculate basal metabolic rate.
â¢ SKELETAL MUSCLE (noun). The noun SKELETAL MUSCLE has 1 sense: 1. a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes. Familiarity information: SKELETAL MUSCLE used as a noun is very rare. SKELETAL MUSCLE (noun). The noun SKELETAL MUSCLE has 1 sense: 1. a muscle that is connected at either or both ends to a bone and so move parts of the skeleton; a muscle that is characterized by transverse stripes. Familiarity information: SKELETAL MUSCLE used as a noun is very rare.