Lumbar Spine Mineral Density Research Articles

Bone mineral density of lumbar spine and its relations to biological and lifestyle factors in middle-aged and aged Japanese women (Part 2). Effects of age and menopause on bone mineral density evaluated by biochemical markers of bone metabolism

Bone mineral density of the lumbar spine (BMD) and biochemical markers for bone turnover were examined to study the mechanisms of age-related and menopause-related bone loss. We measured BMD of the lumbar spine and serum bone alkaline phosphatase (B-AIP) and bone gla-protein (BGP) as markers of bone formation and fasting urinary creatinine-adjusted hydroxyproline (Hyp/Cr) and calcium (Ca/Cr) as those of bone resorption in 166 community-dwelling Japanese women. A highly significant positive correlation between age and each of the biochemical markers, except for Ca/Cr, was observed. This relationship was not linear. Marked elevation in the levels of the markers was found in women in their sixth decade women compared with those in their fifth. All the markers correlated inversely with the BMD and these relationships remained significant after elimination of the effect of age by partialization. When analyzing the subjects in each five-year age group, the positive correlation of Hyp/Cr with Ca/Cr was significant in the subjects aged 45 to 49 and the negative correlation of Hyp/Cr with BMD was significant in those aged 50 to 54. B-AIP correlated positively with BGP in the subjects aged between 50 and 54 and inversely with BMD in those aged between 55 and 59. These correlations were significant. Thus, intercorrelations between the markers were observed five years earlier than were correlations between the markers and BMD. Such associations appeared earlier in terms of the markers for bone resorption than in terms of the markers for bone formation.(ABSTRACT TRUNCATED AT 250 WORDS)

Effect of ipriflavone on bone mineral density of lumbar spine of aged women

Aged women with osteoporosis were followed for 6 months with or without ipriflavone (IP) 600 mg/day, and lumbar bone mineral density (BMD) and bone mineral content (BMC) were evaluated by dual-photon absorptiometry. Although a significant reduction of lumbar BMD was observed in the control group at the end of the experiment, the group treated with IP showed insignificant change. The frequency of deterioration was lower in the IP group compared to the control group. Additionally, the IP effect was more apparent in patients with lower calcitonin and higher bone gla-protein (BGP) levels. These results suggest that IP effectively maintains BMD and BMC of lumbar bone among aged women with osteoporosis, and its activity may be enhanced in patients with low calcitonin and high BGP levels.

A study of bone mineral density of lumbar spine by dual energy x-ray absorptiometry (DEXA) in children

The bone mineral density(BMD) of the lumbar spine (L2-L4) was measured by using dual energy x-ray absorptiometry(Norland XR26 DEXA) in 80 children aged between 2months and 15years (group 1 : 2month-1years, group 2 : 1year-5years, group 3 : 6years-10years, group 4 : 11years-15years). The correlation coefficient of BMD with age, body weight, height and Tanner stage were 0.696, 0.693, 0.717 and 0.636 respectively. There were significant difference in BMD() between group 1(BMD : ) and group 2(BMD : ). and group 3(BMD : ) and group 4(BMD : )(P, Tanner stage 2 : , Tanner stage 3 : )(P

Normative values of lumbar spine mineral density and fracture threshold in Japanese measured by dual photon absorptiometry based on scinticamera methods (Dualomex HC-1)

Using a dual photon absorptiometer Dualomex HC-1 based on the scinticamera system utilizing153Gd, bone density of the lumbar vertebrae was measured to set up normative values for each group in both sexes along with fracture threshold.

Reversible bone loss in women treated with GnRH-agonists for endometriosis and uterine leiomyoma

Oestrogen deficiency at the menopause is associated with changes in calcium and bone metabolism. Hypo-oestrogenism induced by the use of GnRH-agonists is clinically useful in the treatment of oestrogen-dependent diseases. This study was done to investigate calcium homeostasis and bone metabolism of pre-menopausal women in a GnRH-agonist-induced pseudo-menopause. Eighteen patients with endometriosis or uterine leiomyoma received monthly i.m. injections of 3.2 mg of long-acting D-Trp-6-LHRH over a 6-month period. Plasma oestradiol-17 beta and progesterone levels under treatment were significantly decreased to the levels of the early follicular phase. Plasma total calcium, serum osteocalcin and plasma alkaline phosphatase concentrations increased, while plasma phosphate levels did not change. Levels of 1,25-dihydroxyvitamin D3 decreased significantly, but 25-hydroxyvitamin D3 values remained constant. Trabecular bone mineral density of lumbar spine decreased continuously during the 6-month period. Nine women completed 6-9 months follow-up. In these women bone loss was reversible. Cortical bone measurements at the proximal radius showed no change during oestrogen deficiency. In conclusion, our findings demonstrate that GnRH-agonist-induced bone loss is reversible. Furthermore, they suggest that the state of pseudo-menopause induced by GnRH-agonist may serve as a model for further pathophysiological studies on calcium homeostasis and bone metabolism in the post-menopause.

Menstrual function and bone mass in elite women distance runners. Endocrine and metabolic features.

Bone mass and metabolic features were studied in 17 women distance runners. Eleven of the women had secondary amenorrhea for 1 to 7 years. Six women have maintained regular menses since menarche. Both groups were matched for aerobic capacity, body fat, exercise intensity, and age of menarche. Mineral density of lumbar spine in the amenorrheic runners was lower than that in the cyclic women and age-matched controls, but higher than that in runners with secondary amenorrhea who are less physically active. Mineral density of the radius was normal in both groups. Running-related fractures were more frequent in amenorrheic women. Metabolic assessment showed no differences between groups, except that serum triiodothyronine was lower in the amenorrheic group, perhaps reflecting low calorie intake. Intense exercise may reduce the impact of amenorrhea on bone mass; however, amenorrheic runners remain at high risk for exercise-related fractures.