Equation of Sergi et al for Appendicular Skeletal Muscle Mass (ASMM) in an Adult Using Bioelectric Impedance Analysis (BIA)

Appendicular skeletal muscle is that in the limbs. It comprises > 75% of total skeletal muscle mass.

Patient selection: Caucasian adults, age > 60 years

Parameters:

(1) height in centimeters

(2) weight in kilograms

(3) resistance in Ohms at 50 Hz

(4) reactance in Ohms at 50 Hz

(5) sex (male 1, female 0)

resistive index =

= ((height in cm)^2) / (resistance in Ohms)

skeletal muscle mass in kilograms =

= (0.227 * (resistive index)) + (0.095 * (weight)) + (0.064 * (reactance)) + (1.384 * (points for sex)) - 3.964