Purpose
We examined the relation between malnutrition, lifestyle factors, and bone health in AN via dual-energy X-ray absorptiometry (DXA) and peripheral quantitative computed tomography (pQCT).
Methods
Seventy adolescent girls with AN and 132 normal-weighted controls underwent pQCT tibial measures including trabecular volumetric bone mineral density (vBMD), cortical vBMD, and cortical thickness. Participants with AN underwent DXA measures of the axial skeleton. We assessed the association of DXA and pQCT measures with clinical and lifestyle variables.
Results
BMI Z-score and ideal body weight percentage were positively correlated with trabecular vBMD, cortical CSA, and section modulus (p<0.04). Exercise was associated with all pQCT measures, but only with hip BMD by DXA. In AN, use of antidepressants was associated with lower pQCT measures (p<0.03).
Conclusions
Antidepressants may negatively, and exercise positively, influence BMD in adolescents with eating disorders. These findings offer a provocative look at two longstanding questions.