To study how the body was composed through Dual energy X-ray absorptiometry this study was processed, from 1 January to 30 April, 1990, in Department of Nuclear Medicine, Kyung Hee Medical Center. The authors sampled patients executed whole body
examination from those who were carried out Dual energy X-ray absorptiometry examination and than dealt with, except under nineteen year-old patients who were not stopped the growth and development completely. The total number of subjects was
184,
including 65 persons of male and 119 persons of female, The authors measured the physical status of all subjects, and was acquired of body fat weight, body composition between left and right sides, body composition according to body position,
bone
mineral content, bone mineral density and total bone calcium from the Bone densitometry reports.
On the basis of these results, the authors calculated the values of each body structure, physical indices and fatness, and compared the differences between the fatness which was calculated indirectly and the one which gained from the Bone
densitometry
and analyzed other indices in accordance with age and sex.
@ES The results were as follows :
@EN 1. The mean body height was 166.85±6.31 cm in male and 153.78±5.10cm in female, The mean body weight was 64.23±9.64kg in male and 56.27±9.28kg in female.
2. In male, body surface was 1.7182±1.441m2, body volume was 60.00±9.40ι, and body density was 1.076±0.0080kg/ι. In female, body surface was 1.5294±1.272m2, body volume was 51.41±9.00ι, and body density was 1.0398±0.0071kg/ι.
3. Compared body fat (%) calculated by indirect method to body fat (%) by Bone densitometry, in case of indirect method 12.30±3.20% in male and 25.35±3.04% in female, but in case of Bone densitometry 20.63±7.06% in male and 34.90±7.58% in
female,
so there was a considerable difference between two values (p<0.005).
This fact was due to the matter of interpretation according to the aspect of examination and body composition while Dual energy X-ray absorptiometry processing. But nowadays, this interpretation programs are developed and improved, so we should
research
about the body composition continuously through new methods.
In the distribution of body fat (%) according to body position, male showed even distribution, but trunk showed lower distribution than upper and lower limbs in female (p<0.005).
4. In the comparison of body composition between left and right sides, in case of upper and lower limbs, the right side was superior to the left side (p<0.01), but in case of trunk, the left side was superior to the right side (p<0.025) in male.
In
case of lower limb, the right side was superior to the right side (P<0.05), but in case of upper limb, however, there was no difference in female.
In the body composition a according to body position, there seemed to be a similar aspect in both sexes, so the upper limb was 10.59±0.93%, lower limb was 32.79±79%, trunk was 48.86±2.08% and head was 7.76±0.83% in male.
5. In the bone mineral content (%), the mean value of upper limb was 5.51±0.82% and there was no difference according to increasing ages in male. But, in female, the mean value was 3.69±0.96% and lower than that of male (P<0.005), and showed a
decreasing tendency according to increasing ages, so correlation coefficiency r=-0.470 (P<0.005) and regression equation was Y (BMC %) =5.370-0.0312 X (Age).
In lower limb, the mean value was 4.67±0.61% in male and there was also no difference according to increasing ages, in female, the mean value was 3.76±0.56% and showed also a decreasing tendency and correlation coefficiency r=-0.295 (p<0.005),
which
showed lower correlation than upper limb's. In trunk part, BMC (%) showed a decreasing tendency according to increasing ages in male and correlation coefficiency r=-0.322 (p<0.001). In female, there was a considerable decreasing tendency,
correlation
coefficiency r=-0.804 (p<0.005) and regression equation was Y=4.02-0.314 X.
In case of whole body, the mean value of BMC (%) was 4.32±0.50% for male and 3.57±0.64% for female. There was no difference according to increasing ages in male, but in female, showed considerable decreasing tendency and correlation
coefficiency
r=-0.629 (p<0.005) and regression equation was Y=5.08-0.279 X.
6. In the total bone calcium (%), the mean value was 1.64±0.19% for male and 1.37±0.22% for female, so total bone calcium (%) of male was higher than female's (p<0.005). And there was no difference according to increasing ages in male, but in
female,
showed aiso a decreasing tendency and r=-0.691 (p<0.005) and regression equation was Y (Ca)=1.94-0.0107 X (Age).
In the regression analysis between total bone calcium (%) and body height and body weight, considerable high correlation was to be both sexes.
7. In the bone mineral density, the mean value was 1.12±0.10g/cm2 for female, so bone mineral density of male was higher than female's (p<0.005). And there was no difference according to increasing ages in male, but in female, showed also a
decreasing
tendency and r=-0.591 (p<0.005) and regression equation was Y (BMD)=1.27-0.00496 X (Age).
As mentioned above, it seems the study of body composition through Dual energy X-ray absorptiometry to have many problems. But nowadays, the interpretation programs are developed and improved, so the use of this method will be increased
hereafter.
In study of body composition during growth and development, it is possible to show the values of each body structure, physical indices and fatness which can not be measured in general, therefore, the study through Dual energy X-ray
absorptiometry
will
have to be continued.
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