Abstract
In an effort to define predictors of bone mineral density in competitive female runners, 28 eumenorrheic women (age 24.4±4) were assessed for bone density, body composition, dietary intake, serum IGF-1 and running mileage. Bone mineral density (g/cm2) of the lumbar spine (LSBMD), femoral neck (FBMD), total hip (TBMD), whole body (WBMD) and body composition(%fat) were measured by dual energy x-ray absorptiometry (Hologic QDR-1000/W). Serum samples of IGF-1 (ng/mL) were analyzed by RIA. Daily dietary intake of total calories (Kcals), calcium (Cal, mg) and protein (Pro, g) were assessed by a four day diet record. Weekly average running mileage (Miles) was obtained in combination from self reports and analysis of training logs. Mean and standard deviations for all variables are presented below:Table Multiple regression analysis revealed that calcium intake explained 56% of the variance in femoral neck BMD and 55% in spine BMD (p=.05). No other independent variables studied were found to correlate with bone mineral density. In conclusion, in this group of competitive female runners, calcium intake was an important determinant of bone mass at clinically relevant sites.
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