Bone Structure and Geometric Properties at the Radius and Tibia in Adolescent Endurance-Trained Cyclists

Objective: To describe cortical and trabecular volumetric bone mineral density (vBMD), bone mineral content (BMC), cross-sectional area (CSA), and bone strength indexes (BSIs) in adolescent endurance-trained cyclists (CYC) and compare them with controls (CON). Design: Descriptive cohort study. Participants: Twenty-five male adolescent CYC and 17 CON. Assessment of Risk Factors: Peripheral quantitative computed tomography was used to evaluate proximal and distal sites of the radius and tibia. Main Outcome Measures: Total, trabecular, and cortical BMC, vBMD, and CSA were measured. Also, cortical thickness, endosteal and periosteal circumferences, and different BSIs were calculated. Unadjusted analysis of variance and body weight-adjusted analysis of covariance tests were applied between cyclist and control groups. Results: Cyclists were almost 12% lighter than CON (P

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