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  The purpose of this study was to investigate the effect of exercise to mentally retarded women"s bone mineral density. Subjects were divided into three groups: Group A(age:27.9yr, n=8)-This group was mentally retarded exercise women, who had been doing regularly exercise for over three years. Group B(age:28.8yr, n=8)-This group was mentally retarded non exercise women, who hadn"t been doing it as usual. Group C(age:29.0yr, n=8) This group was normal women, who hadn"t been doing it as usual.
  This study analysed and compared the bone mineral density between these three groups. The results were summarized as follow.
  1. The BMI of group A(Mentally retarded exercise group) was 22.8±3.28 ㎏/㎡, group B(mentally retarded non exercise group) was 22.6±5.6 ㎏/㎡, and Group C(normal group)was 22.0±2.2 ㎏/㎡. There were no significant differences in BMI between three groups.
  2. There were significant difference in grip strength and back strength between three groups(p＜.001). The grip strength of group A was 16.9±6.5 ㎏, group B was 12.2±4.0 ㎏, and group C was 31.8±2.1 ㎏. The back strength of group A was 36.9±16.1 ㎏, group B was 34.2±8.4 ㎏, and group C was 96.9±32.7.
  3. These were significant difference bone mineral density of lumbar between these groups. Group A was 0.1±0.08 g/㎠, Group B was 0.888±0.10 g/㎠, and group C was 1.05±0.04 g/㎠(p＜.01).
  4. These were very significant difference bone mineral density of femur between these groups. Group A was 0.91±0.09g/㎠, group B was 0.74±0.08 g/㎠, and group C was 0.97±0.l4 g/㎠(p＜.000l).
  5. These were very significant difference bone mineral density of Forearm between these groups. Group A was 0.6±0.02 g/㎠, group B was 0.56±0.03g/㎠, and group C was 0.63±0.02 g/㎠(p＜.000l).
  6. Group A were correlations between bone mineral density of femur(neck) and BMI, weight(p＜.05).
  7. Group B were correlations between bone mineral density of forearm(MID, total) and age(p＜.05).
  8. Group C were correlations between bone mineral density of lumbar(L1) and age, BMI, back strength(L4).

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