Abstract
Sports participation plays an important role in bone gain during childhood and adolescence. The aim here was to identify sex-related determinants of bone mineral density (BMD) differences between male and female adolescents, with emphasis on the role of sports participation. Longitudinal study conducted in a public university in Presidente Prudente, Brazil. The sample comprised 48 adolescents aged 11-17 years, of both sexes, who were matched according to sex, age and sports participation. BMD was the main outcome, while muscle mass, sports participation, calendar age and biological maturation were treated as covariates. Participants were followed up after nine months. At baseline, BMD values were similar between the sexes. However, adjustment for covariates showed that BMD was higher among girls at all sites, with a contribution from lean soft tissue (LST) in the model (partial eta-squared, ES-r = 0.619 in upper limbs; 0.643 in lower limbs; 0.699 in spine; and 0.599 in whole body). Sports participation only explained the upper-limb variance (ES-r = 0.99). At the follow-up, the results resembled the baseline except in the lower limbs (P = 0.109), in which BMD was similar between the groups. BMD gain over time was similar between girls and boys in all segments, and baseline LST affected upper-limb and whole-body BMD accrual (ES-r = 0.396 and 0.107, respectively). Whole-body and specific-site BMD differed between baseline and follow-up. However,BMD accrual was similar between the sexes, given that muscle mass constituted the most relevant determinant of the difference between them.
Highlights
Bone health has become a concern in modern society due to the economic burden and impairment in quality of life caused by osteoporosis.[1]
The peak bone mass reached during this period is a determinant of bone mineral density (BMD) observed during adulthood, and this constitutes a relevant determinant of the risk of osteoporosis in adulthood.[7]
SD = standard deviation; 95% confidence intervals (95% CI) = 95% confidence interval; PHV = peak height velocity; LST = lean soft tissue
Summary
Bone health has become a concern in modern society due to the economic burden and impairment in quality of life caused by osteoporosis.[1] Osteoporotic fractures increase both healthcare costs and the risk of early mortality.[2,3,4] Taking into account the epidemiology of osteoporosis, women exhibit greater risk of developing osteoporosis than do men This greater risk for the female sex is strongly determined by specific events that occur during adolescence.[5]. The aim here was to identify sex-related determinants of bone mineral density (BMD) differences between male and female adolescents, with emphasis on the role of sports participation. BMD accrual was similar between the sexes, given that muscle mass constituted the most relevant determinant of the difference between them
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