TY - JOUR T1 - Influence of extracurricular sport activities on body composition and physical fitness in boys: a 3-year longitudinal study. AU - Ara,I, AU - Vicente-Rodriguez,G, AU - Perez-Gomez,J, AU - Jimenez-Ramirez,J, AU - Serrano-Sanchez,J A, AU - Dorado,C, AU - Calbet,J A L, PY - 2006/6/28/pubmed PY - 2007/3/1/medline PY - 2006/6/28/entrez SP - 1062 EP - 71 JF - International journal of obesity (2005) JO - Int J Obes (Lond) VL - 30 IS - 7 N2 - OBJECTIVE: To analyse the effect of extracurricular physical activities on fat mass accumulation and physical fitness during growth in early pubertal males. DESIGN: Longitudinal study. SUBJECTS: A total of 42 male children (9.4+/-1.4 years, Tanner I-II and 12.7+/-1.5 years, Tanner III-IV, before and after the 3.3 years follow-up, respectively), randomly sampled from the population of Gran Canaria (Spain), 26 of them physically active (PA, at least 3 h per week during 3 years) and 16 non-physically active (non-PA). MEASUREMENTS: Body composition (dual-energy X-ray absorptiometry), anthropometrics (body circumferences and skinfolds) and physical fitness variables (dynamic and isometric force, anaerobic capacity and maximal aerobic power) were determined in all subjects. RESULTS: Both groups had comparable body sizes at the start and the end of the study. Body mass index increased with growth more in the PA than in the non-PA group (P<0.05). However, fat mass accumulation with growth was lower in the PA than in the non-PA (P<0.05). There was a positive relationship between the increment of total and trunkal fat mass, especially in non-active children (r2=0.93). In contrast, there was an inverse relationship between the total lean mass growth and the accumulation of total and regional fat mass (r=-0.37 to -0.41, all P<0.05). Physical fitness was maintained in the PA, while it worsened in the non-PA children. CONCLUSIONS: Without any dietary intervention, children who regularly participate in at least 3 h per week of sports activities are more protected against total and regional fat mass accumulation. They also increase their total lean and bone mass to a greater extent than children who do not participate in extracurricular sport activities. In addition, PA children maintain their physical fitness during growth, while it deteriorates in the non-PA children. SN - 0307-0565 UR - https://www.unboundmedicine.com/medline/citation/16801944/Influence_of_extracurricular_sport_activities_on_body_composition_and_physical_fitness_in_boys:_a_3_year_longitudinal_study_ L2 - http://dx.doi.org/10.1038/sj.ijo.0803303 DB - PRIME DP - Unbound Medicine ER -