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Influence Of Sports Practice On Bone Status In Female Adolescent Athletes: 202 Board #53 May 27, 9

Adolescence is critical period for an adequate development of the peak bone mass and participation in sports has been recommended, due to the positive effect of mechanical load on bone mineralization. However, different sport modalities (i.e, handball and swimming) result in different mechanical loads on the bone and it is still unclear the effects on bone status assessed in the no weight-bearing site, as the proximal phalanges of hand, during sports practice in adolescents. PURPOSE: To verify the influence of different sports’ practice on the bone tissue in female adolescents. METHODS: Total of 329 female adolescents were analyzed separated into three groups: Handball athletes (n=55: 14.5±0.8 yrs, 162.4±5.7 cm and 60.6±10.4 kg), Swimming athletes (n=49:14.8±1.0 yrs, 163.3±5.9 cm and 56.6±9.7 kg) and Control group (n=225: 14.8±1.0 yrs, 163.8±5.6 cm and 56.5±6.2 kg). The Quantitative Ultrasound was used to evaluate the Amplitude Dependent Speed of Sound (AD-SoS in m/s) and Bone Transmission Time (BTT in μs) parameters, and their z-scores (SDS) were calculated for each group. To compare AD-SoS and zADSoS between groups was used the analysis of variance (ANOVA). The Kruskal Wallis test was performed for BTT and zBTT. The training time between the groups of athletes was compared using the Mann-Whitney test. RESULTS: All participants were in Tanner’s stage IV or V. No differences were observed for age and height among groups. The swimmers showed significantly higher values (p=0.03) of AD-SoS and zAD-SoS (2088±43.8 m/s and 0.47±0.8) than controls (2067±54.0 m/s and 0.09±1.0) and both swimmers and handball athletes had their BTT (handball: 1.44±0.2 μs, swimming: 1.45±0.2 μs, control: 1.37±0.2 μs) and zBTT (handball: 0.71±0.8, swimming: 0.72±1.1, control: 0.32±0.9) levels higher than the control group. No difference in the bone parameters was seen between the athletes groups, though the swimmers showed more training time and in weekly sessions those handball players (p≤ 0.002) (all athletes were ask about session and age of onset of training). CONCLUSIONS: We conclude that the sports practice does influence on the bone mass parameters and their higher values are related with the frequency and the time of training and independently of weight bearing intensity.