To analyze the impact of participation in sports with different cardiorespiratory fitness (CRF) demands on changes in metabolic and cardiovascular markers in adolescents. Longitudinal study with 12 months of follow-up (Analysis of Behaviors of Children During Growth [ABCD Growth Study]). Overall, 184 adolescents (age 15.6 ± 2.1) were classified according to sports participation: non-sport (control), low CRF sports, and high CRF sports. Metabolic outcomes were total cholesterol (TC) and its fractions, triacylglycerol (TG), glucose, insulin levels, and the insulin resistance index. Cardiovascular outcomes were arterial thickness (carotid and femoral [ultrasound]), blood pressure, and resting heart rate. Adolescents engaged in sports classified as high CRF demand presented a significant increase in HDL-c (1.2 mg/dL [95% CI: −0.5 to 3.0]) when compared to the non-sport group (−2.4 mg/dL [95%CI: −4.4 to −0.5]). Regular engagement in high CRF sports was significantly related to changes in TC (β = −0.027 [95%CI: −0.048 to −0.005]), HDL-c (β = 0.009 [95%CI: 0.001 to 0.019]), LDL-c (β = −0.032 [95%CI: −0.049 to −0.016]), and glucose (β = −0.017 [95%CI: −0.025 to −0.008]), while engagement in low CRF sports was related to changes in TG (β = −0.065 [95%CI: −0.112 to −0.019]). No significant relationships for cardiovascular parameters were observed in the low CRF group, but one significant relationship was found between high CRF sports and changes in SBP (β = −0.063 [95%CI: −0.117 to −0.009]). In conclusion, engagement in sports seems to be beneficial for improvements in metabolic and cardiovascular parameters in adolescents, mainly sports with higher CRF demand.

No abstract

No abstract

Background: Resistance training is a known method for weight reduction, but in apparently healthy adolescents the effects on health aspects are not clear. Aims: Was to analyze the relationship between resistance training (RT) and body composition in adolescents over a 12-month follow-up. Methods: Longitudinal study conducted at a public university in Presidente Prudente, SP, Brazil. Data from a study entitled the “ABCD- Growth Study” were used. The sample consisted of 190 adolescents of both sexes from schools (public and private) and sports clubs in Presidente Prudente, Brazil, divided into 3 groups according to RT practice: non-engagement (n=121), irregular engagement (n=44), and frequent engagement (n=25). Engagement in RT was assessed by face-to-face interviews. The bone mineral density (BMD), lean soft tissue (LST), and body fatness (BF) were analyzed using dual-energy x-ray absorptiometry (DXA). All data analyses were performed using BioEstat statistical software (version 5.0) and the statistical significance was set at 5% (p-value <0.05). Results: After 12-months of follow-up, adolescents frequently engaged in RT presented higher gains in LST (6.160 kg [3.727 to 8.593]) and BMD-upper limbs (0.096 g/cm2 [0.072 to 0.121]) when compared to adolescents who were not engaged in RT (2.452 kg [1.461 to 3.442] and 0.096 g/cm2 [0.072 to 0.121], respectively). Findings were more consistent for boys than girls. Conclusion: Regular engagement in RT seems to be related to higher gains in muscle mass and bone density, especially among boys.