Background: The aims of this study was to
assess the reliability and validity of recentlydeveloped
new hand-foot segmental bioelectrical
impedance body composition analyzer in determination
of the % body fat (%BF) and fat-free mass (FFM)
among Korean adults.
Methods: The study subjects were all volunteers
composed by 35 males and 22 females. The %BFuw
measured by underwater weighing technique (UW)
was the reference values. The %BFHK estimates
obtained from bioelectrical impedance body
composition anlyzer (Healthkeeper, HK). Gender-specific
equations were cross-validated. Means (M), standard deviations (SD), correlation coefficients (r), standard
errors of estimate (SEE) and total errors (TE) were
compared to the criterion test of underwater
weighing (%BFUW) at residual lung volume.
Results: There were high correlation coefficients
as ry,y'=.89 and .80 for men and women,
respectively, The prediction errors were moderate as
SEE=2.5%, and TE=2.9% for men, SEE=2.8%, and
TE=2.3% for women, respectively. The difference
between the average %BFUW and %BFHK were
small for men (0.7%) and women (0.9%). For both
gender, the lines of identity did not differ
significantly (p>.05) from the lines of best fit.
Conclusion: Use of the Heathkeeper body
composition analyzer is suitable for the assessing the
% body fat (%BF) and fat-free mass (FFM) among
Korean adults with normal range of percentage body
fat.

Keywords: Reliability, Validity, Bioimpedance, Body fat, Fat-free mass