1. Allen TH, Anderson EC, Langham WH (1960) Total body potassium and gross body composition in relation to age. J Gerontol 15:348–357
2. Yamada Y (2015) Assessment of skeletal muscle mass, strength and frailty. In: Shimada H (ed) Prevention and rehabilitation of the frailty (FUREILU NO YOBOU TO RIHABIRITESHON). Ishiyaku Publishers, Inc., Tokyo
3. Janssen I, Heymsfield SB, Wang ZM, Ross R (2000) Skeletal muscle mass and distribution in 468 men and women aged 18–88 year. J Appl Physiol (1985) 89(1):81–88
4. Mitchell WK, Williams J, Atherton P, Larvin M, Lund J, Narici M (2012) Sarcopenia, dynapenia, and the impact of advancing age on human skeletal muscle size and strength; a quantitative review. Front Physiol 3:260. https://doi.org/10.3389/fphys.2012.00260
5. Ferrucci L, de Cabo R, Knuth ND, Studenski S (2012) Of Greek heroes, wiggling worms, mighty mice, and old body builders. J Gerontol A Biol Sci Med Sci 67(1):13–16. https://doi.org/10.1093/gerona/glr046