Wang et al developed equations for predicting whole-body skeletal muscle mass from total body potassium (TBK). The authors are from St. Luke’s-Roosevelt Hospital and Columbia University in New York City.
Method for measuring TBK: whole body gamma counting with 40-K
skeletal muscle mass in kilograms =
= (TBK in mmol) * 0.0085 =
= (TBK in mmol) * (1 / (123.7 – (age in years)))
where:
• The equation is similar to lean body mass from TBK in 02.01.08.
• The values in the second equation range from 0.00816 at 10 years of age to 0.008873 at 100 years of age.
skeletal muscle mass in kilograms =
= (0.0093 * (TBK in mmol)) – (1.31 if male) + (0.59 if Black) + (0.024 * (age in years)) – 3.21
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