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1 Department of Medicine, Winthrop-University Hospital, Mineola 11501; and 2 Brookhaven National Laboratory, Upton, New York 11973
Previous cross-sectional studies using delayed gamma
neutron activation analysis and whole body counting suggested that the relationship of total body calcium (TBCa) to total body potassium (TBK)
(muscle mass, body cell mass) remained constant with age. This led to
the hypothesis that the muscle mass and skeletal mass compartments are
integrated in their response to aging. It had also been hypothesized
that loss of skeletal and muscle mass was similar between races. In the
current study, delayed gamma neutron activation analysis and whole body
counting were performed on 90 black and 143 white women 20-69 yr
of age. Black women had higher TBCa and TBK values than white women,
even when the data were adjusted for age, height, and weight. TBCa was
correlated with height and TBK with weight. The estimated decline of
skeletal mass (TBCa) from 20 to 70 yr was 18% in black women and 19%
in white women. However, the lifetime decline of TBK was only 8% for
black women, compared with 22% for white women. Black women may lose
TBK more slowly than TBCa with aging, compared with white women. In
particular, correlation of TBCa and age was similar for blacks and
whites (r = 
0.44 and r = 0.54,
respectively). However, for TBK these correlations were r = 0.14 and r = 0.42. These data confirm a
higher musculoskeletal mass in black women and suggest that the loss of
muscle mass with age may be lower in black than in white women. These
ethnic differences do not support the hypothesis of an integrated
musculoskeletal system, so that these two components should be
considered separately. A prospective study is needed to confirm these findings.
body composition; osteoporosis
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