Compound of 筋肉 (muscle) + 量 (amount). The suffix 量 attaches to many nouns to mean "amount of —" (水分量, 脂肪量, 仕事量).
Common collocations
- 筋肉量が増える: muscle mass increases
- 筋肉量が落ちる: muscle mass declines
- 筋肉量を維持する: to maintain muscle mass
- 筋肉量を測定する: to measure muscle mass
Similar words
- 体脂肪: body fat — often discussed alongside muscle mass
- 筋力: muscle strength — about how strong the muscle is, not its quantity