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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.
The Lean Body Mass (LBM) is a part of the body. It is normally defined to be the body weight minus the body fat. Typically lean body mass is 60-90% of the total body mass. Normally, men have higher port of lean body mass than women. Some anaesthetic agents dosage, especially water-soluble drugs, are routinely based on the lean body mass value.