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Abstract (Ohkawara K in BC 2005)
Serial measurements of human body composition during the weight-loss
intervention in Japanese men
Ohkawara K, Tanaka K, Ono Y, Nakata Y, Katayama Y, Numao S, Nakadomo
F
Few studies have reported on serial measurements of human
body composition during weight-loss intervention in Japanese men. The
purpose of this study was to investigate the changes in human body composition
during the 13-week weight-loss intervention. Eight overweight Japanese
men (age; 49.8}11.3 yr, body mass index; 28.2}0.6 kg/m2) participated
in this study. Fat mass (FM) and fat-free mass (FFM) were measured by
dual energy x-ray absorptiometry at baseline, and at weeks 1, 4, and
13. Total body water (TBW) was measured by deuterium dilution technique
at baseline, and at weeks 4 and 13. With the diet, weight loss averaged
-1.9}0.6 kg (22.3% for total weight loss) by week 1, -4.4}1.3 kg (52.4%)
by week 4, and finally -8.4}2.1 kg. FM loss averaged -1.1}0.5 kg (15.1%
for total FM loss) by week 1, -3.6}1.0 kg (48.3%) by week 4, and finally
-7.5}2.5 kg. FFM loss averaged -0.7}0.9 kg by week 1, which corresponded
to 83.4 % for total FFM loss (-0.9}1.5 kg). TBW decreased by -1.9}4.1
L for the whole intervention, almost all of which occurred during initial
four weeks. These results suggest that 1) the loss in FM per day decreases
gradually with the lapse of the weight-loss intervention period, and
2) FFM loss is attributed to almost TBW loss during an early phase of
the intervention.