Effect of training mode and calcium intake on bone mineral density in female master cyclists, runners, and non-athletes

The focus of this prospective, observational study was to determine the eff ect of sport-specific training and calcium intake on bone mineral density ( BMD) in female master cyclists, runners and non-athletes. Thirty women (12 cyclists, 9 runners, 9 controls), mean age of 49.6 +/- 7.9 years, were asse ssed at baseline and 18 months for calcium intake (4-day records), current exercise activity (recall questionnaire), and BMD of the lumbar spine and h ip (DXA). A three (cyclists, runners, controls) by two (0 and 18 months) re peated measures ANOVA demonstrated a significant interaction effect of spor t and time at the femoral neck (p < .04). Tukey post hoc analysis indicated that the BMD of the femur was maintained in cyclists and runners but decli ned in controls (p < .05). A significant time effect was noted in BMD at th e lumbar spine (p < .001) and the trochanter (p < .003). BMD of the lumbar spine was maintained in runners but declined in cyclists (p < .007) and in controls (p < .03), while trochanteric BMD declined in all groups (p < .01) . No significant interaction effect of sport and dietary calcium intake was noted for BMD at any site.