| Summary: | 碩士 === 國立陽明大學 === 臨床護理研究所 === 92 === Abstract
This study examined the calcium intake, urinary calcium excretion and bone mass of young females. Forty-two Taiwanese Women, aged 20-30 years, participated in the study. Physical activity data, 3-d dietary intake record, 24-h urine samples and hair samples were collected. The bone mass was measured at the spine（lumbar vertebrae 1-4）, the non-dominant femur（neck, trochanter, intertrochanter, ward’s trangle and total hip）Using dual energy x-ray absorptiometry. The average dietary intake of calcium and sodium was 390.1 ± 184.6 mg/d and 3558.5 ± 871.5 mg/d, respectively. Urinary calcium excretion was 87.8 ± 50.1 mg/d. About 26﹪of the studied young women had regular physical activity. The bone densities of various sites were as follows：Femur neck 0.778 ± 0.097 g/cm2, trochanter 0.665 ± 0.090 g/cm2, intertrochanter 1.040 ± 0.117 g/cm2, total hip 0.885 ± 0.101 g/cm2, Ward’s triangle 0.739 ± 0.122 g/cm2 and lumar1-4 1.003 ± 0.106 g/cm2. These bone densities values were lower than the published values of young women. The bone mineral content and bone density of spine and femur were not related to the calcium intake. The sodium intake was negatively correlated （p＜0.05）with bone mineral content at four femur sites（neck, trochanter, intertrochanter, and total hip）.The hair calcium content correlated well（p＜0.05）with bone mineral content of lumbar1-4. Positive relationships were observed between the physical activity level in the previous year and bone mineral content of intertrochanter and total hip, as well as the bone density of femur neck and trochanter（p＜0.05）.The low values of bone density in association with the low level of physical activity and high intake of sodium of these young women are cause of concern.
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