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Normal Bone Mass in Bulimic Women

Address all correspondence and requests for reprints to: Jorunn Sundgot-Borgen, Ph.D., University of Sport and Physical Education, P.O. Box 4014, Ullevål Hageby, 0806 Oslo, Norway. E-mail: jorunn{at}brage.idrettshs.no

The aim of this study was to examine the relationship among exercise, menstrual function, and bone mineral density (BMD) in different groups of age-matched patients with eating disorders. Dieting and eating disorder history, physical activity history, and menstrual history were assessed by clinical interview in 43 bulimic and 13 anorectic young women as well as in 17 healthy control subjects (18–29 yr). BMD was assessed by dual x-ray absorptiometry. All the anorectics but only 30% of the bulimics exercised regularly from the onset of their eating disorder (P < 0.01), mainly using aerobic dancing and running. All of the anorectics had been amenorrheic since the start of their symptoms, and 68% of the bulimics had a history of menstrual dysfunction. Within the exercise subgroups of bulimic patients, there was no significant relationship between BMD and current or previous menstrual function. Anorectic patients had lower BMD than bulimics and controls in all skeletal regions studied (P < 0.01). Bulimic patients who had exercised regularly during their illness had higher total body BMD than bulimics classified as sedentary (P < 0.01). Bulimics who had exercised regularly or intermittently since the onset of their eating disorder had higher BMD than sedentary bulimics in the lumbar vertebrae, femoral neck, and legs (P < 0.05). It appears that weight-bearing exercise can prevent or attenuate bone loss at specific skeletal sites in normal weight bulimic patients, but not in anorectics.

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