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KMID : 1135520110070030153
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Korean Journal of Exercise Rehabilitation
2011 Volume.7 No. 3 p.153 ~ p.163
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Relationship of Leg Muscle Strength and Body Fat on Bone Mineral Density in Healthy Women Aged Over 60 to 80 Years
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Park Jin-Kook
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Abstract
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The purposes of the present study were to examine the association between Fat mass and muscle strength and bone mineral density(BMD) the elderly women. The muscle strength is also regarded as predictive factor to the bone mineral density. Therefore, the present study was designed to investigate the correlation between muscle strength and body composition and bone mineral status. The subject consists of 137 old women. The subjects were tested for anthropometry. At the same time the heel(calcaneus bone) BMD(HBMD) were measured by quantitative ultrasonography(QUS). body composition was measured by inbody 7.0(bioelectrical impedance analysis). Isokinetic knee flexion, extension peak torque measured using a BIODEX system 4 dynamometer. Correlation analyses showed that HBMD of old women was correlated isokinetic variable, but not percent fat, waist-hip ratio, visceral fat. The cut-off value of 60˚/sec extenstion peak torque, according to the receiver operating characteristic curve, was 66.1Nm(sensitivity 84.48%, specificity 53.16%, p<.05) and 180˚/sec flexion peak torque, according to the receiver operating characte- ristic curve, was 22.3.1Nm(sensitivity 81.03%, specificity 50.63%, p<.05) and 180˚/sec extenstion peak torque, according to the receiver operating characte- ristic curve, was 44.6Nm(sensitivity 87.93%, specificity 49.37%, p<.01). In conclusion LBM, lower leg strength of old women is believed to the best factor predictive to HBMD. however the relationship of HBMD with body fat is attenuated with old women.
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KEYWORD
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elderly women, osteoporosis, bone mineral density, isokinetic
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