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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Osteoporosis in anorexia nervosa: the influence of peak bone density, bone loss, oral contraceptive use, and exercise.
Journal of Bone and Mineral Research 1992 December
Anorexia nervosa occurs early in life and predisposes to osteoporosis. Exercise may be protective. We asked: (1) Does failure to attain peak bone density contribute to the deficit in bone density? (2) Does oral contraceptive use protect against osteoporosis? (3) Is any protective effect of exercise confined to weight-bearing sites? Areal bone density (g/cm2) and body composition were measured by dual x-ray absorptiometry in 65 patients with anorexia nervosa and 52 controls. Comparing the 12 patients with primary amenorrhea and the 37 patients with secondary amenorrhea, bone density (mean +/- SEM) at the lumbar spine was 0.88 +/- 0.04 versus 1.06 +/- 0.03 (P = 0.001), respectively. Bone density at the femoral neck was 0.80 +/- 0.04 versus 0.92 +/- 0.03 (P < 0.05), respectively. These values differed before, but not after, adjusting for the respective duration of illness (73.0 +/- 10.3 versus 34.1 +/- 4.8 months, P < 0.001) and fat-free mass (31.6 +/- 1.3 versus 35.4 +/- 0.5 kg, P < 0.01). Bone density at the lumbar spine in the 16 patients with 31.8 +/- 8.3 months of contraceptive exposure was higher than in the 49 patients with no contraceptive exposure (1.14 +/- 0.05 versus 1.02 +/- 0.02 P < 0.02) but was lower than in controls (1.14 +/- 0.05 versus 1.27 +/- 1.02, P < 0.01). No protective effect of contraceptive exposure was detectable at the femoral neck.(ABSTRACT TRUNCATED AT 250 WORDS)
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