Site-specific advantages in skeletal geometry and strength at the proximal femur and forearm in young female gymnasts.

Bone
Jodi N DowthwaiteTamara A Scerpella

Abstract

We evaluated site-specific skeletal adaptation to loading during growth, comparing radius (RAD) and femoral neck (FN) DXA scans in young female gymnasts (GYM) and non-gymnasts (NON). Subjects from an ongoing longitudinal study (8-26yr old) underwent annual DXA scans (proximal femur, forearm, total body) and anthropometry, completing maturity and physical activity questionnaires. This cross-sectional analysis used the most recent data meeting the following criteria: gynecological age ≤2.5yr post-menarche; and GYM annual mean gymnastic exposure ≥5.0h/wk in the prior year. Bone geometric and strength indices were derived from scans for 173 subjects (8-17yr old) via hip structural analysis (femoral narrow neck, NN) and similar radius formulae (1/3 and Ultradistal (UD)). Maturity was coded as M1 (Tanner I breast), M2 (pre-menarche, ≥Tanner II breast) or M3 (post-menarche). ANOVA and chi square compared descriptive data. Two factor ANCOVA adjusted for age, height, total body non-bone lean mass and percent body fat; significance was tested for main effects and interactions between gymnastic exposure and maturity. At the distal radius, GYM means were significantly greater than NON means for all variables (p<0.05). At the proximal femur...Continue Reading

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Citations

Apr 20, 2014·Medicine and Science in Sports and Exercise·Jodi N DowthwaiteTamara A Scerpella
Sep 24, 2013·Metabolism: Clinical and Experimental·Maria MichalopoulouIoannis G Fatouros
Sep 10, 2014·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·Qin WangSulin Cheng
Apr 17, 2014·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·Vina P S TanHeather A McKay
Jul 17, 2013·Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research·Michael BehringerJoachim Mester
Mar 6, 2015·Osteoporosis International : a Journal Established As Result of Cooperation Between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA·S A JackowskiM C Erlandson
Dec 8, 2017·Journal of Eating Disorders·Anne DrabkinPhilip S Mehler

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