VALIDITY OF BIOELECTRICAL-IMPEDANCE ANALYSIS TO MEASURE BODY-FAT IN AIR-FORCE MEMBERS

This study determined if the bioelectrical impedance analysis (BLA) me thod was a more valid assessment of body fat in Air Force members than the current Air Force circumference (AF) method. Both methods were co mpared with hydrostatic weighing, which is the presumed standard for i dentifying body fat. Subjects included 50 male and 50 female active du ty Air Force members between the ages of 19 and 47 years. The AF metho d had higher correlation coefficients and lower standard error of esti mates for both male and female subjects (r = 0.91 [3.00%] and r = 0.79 [3.28%], respectively) than the BIA method (r = 0.84 [3.25%] and r = 0.75 [4.30%], respectively). The false-positive rates for individuals having excess body fat mere greater for the AF method (14.7 and 29.3% for males and females, respectively) than the BIA method (7.3 and 8.8% for males and females, respectively). The data suggest that caution s hould be used when the current AF method or the BIA method is used to make individual Air Force career decisions.