Lower birth weight has a negative association with adult BMC and body composition in young adult Swedish women.

Recreational physical activity in 25-year-old women in Sweden increases bone mineral density (BMD) in the trochanter by 5.5% when combining regularity and impact. Jogging and spinning were especially beneficial for hip BMD (6.4–8.5%). Women who enjoyed physical education in school maintained their higher activity level at age 25.

S343 A bsracts age 45 and 18.5% reported a fall resulting in a fracture within the past 5 years. The mean (SD) serum 25(OH)D was 30.4 (13.2) ng/mL, median 29 ng/mL (range 7-212 ng/mL). 1.1% had 25(OH)D <9 ng/mL, 8.1% < 15 ng/mL, 18% < 20 ng/mL, 36% < 25 ng/mL and 52% < 30 ng/mL. 16.5% had evidence of secondary hyperparathyroidism as defined by a normal serum calcium and an elevated PTH. The prevalence of D insufficiency (25(OH)D < 25 ng/mL) was significantly higher in subjects who took less than 400 IU of D supplementation daily compared with those who took at least 400 IU daily (47% vs 28% respectively, p<0.001). This study demonstrates that approximately 50% of North American women currently receiving treatment for osteoporosis have suboptimal 25(OH)D levels. Despite routine recommendations for OTC vitamin D supplementation by physicians, D insufficiency is highly prevalent even among women diagnosed and treated for osteoporosis.