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Impact of sports participation on adolescent bone health: ABCD - Growth Study


OBJECTIVES: To analyze, over a year of follow - up, the impact of sports participation on bone health parameters among adolescents of both sexes. METHODS: A longitudinal study with a 12-month follow-up, in which at least 202 adolescents of both sexes and age between 11 and 18 years will be evaluated. As outcomes, bone density, bone geometry, bone fractures and blood parameters of bone remodeling will be considered. Sports participation will be the independent variable, in which adolescents will be stratified into: 1- Control group, 2- Swimming Group, 3- Impact Sports Group (athletics, basketball, baseball, artistic gymnastics and field tennis) and 4- Combat Sports Group (Karate, Judo and Kung Fu). As adjustment variables, gender, age, biological maturation, ethnicity, sleep quality, physical activity, nutritional, hormonal and inflammatory variables will be considered. The statistical analysis will be essentially composed of analysis of covariance, with measures of effect size (eta-squared). EXPECTED RESULTS: It is expected to identify if sports participation is able to boost the natural bone mass gain that occurs during adolescence, and, if so, it is expected to identify through which pathways the sport can promote bone health (hormonal or structural). (AU)