RT journal article T1 The Federated Practice of Soccer Influences Hamstring Flexibility in Healthy Adolescents: Role of Age and Weight Status A1 Ponce González, Jesús Gustavo A1 Gutiérrez Manzanedo, José Vicente A1 Castro Maqueda, Guillermo Ramón de A1 Fernández-Torres, Victor Jose A1 Fernández Santos, Jorge del Rosario A2 Didáctica de la Educación FísicaPlástica y Musical K1 adolescents K1 deep trunk flexion K1 sit and reach test K1 soccer AB The aim of this study was to compare the hamstring flexibility between federated soccer and non-federated adolescents, and also to evaluate the effect of age and weight status on hamstring flexibility. The participants were 234 students (11-18 years old) divided into: (i) G1: non-federated (n = 127), and (ii) G2: federated in soccer (n = 107). The deep flexion of the trunk (DF) test and the sit and reach test (SRT) were performed. G2 showed higher values for the DF and SRT compared to G1 (p < 0.05). Both flexibility tests correlated positively (r = 0.4, p < 0.001). Body mass index (BMI) was negatively correlated with the DF test (r = -0.3, p < 0.001), but not with the SRT. Divided by BMI, the underweight and normal weight groups had higher scores in the DF test compared with the overweight and obese groups (p < 0.001). BMI was negatively correlated with hamstring flexibility. Federated soccer students present higher scores of hamstring flexibility. PB MDPI SN 2075-4663 YR 2020 FD 2020-04 LK http://hdl.handle.net/10498/23151 UL http://hdl.handle.net/10498/23151 LA eng DS Repositorio Institucional de la Universidad de Cádiz RD 13-nov-2026