RT journal article
T1 Age-Related Differences and Reliability of a Field-Based Fitness Test Battery in Young Trained Footballers: The Role of Biological Age
A1 Jiménez Iglesias, José
A1 Gonzalo-Skok, Oliver
A1 Landi Fernández,  Mario
A1 Perez-Bey, Alejandro
A1 Castro Piñero, José
A2 Didáctica de la Educación FísicaPlástica y Musical
K1 soccer
K1 cardiorespiratory fitness
K1 muscular strength
K1 change-of-direction ability
K1 peak height velocity
K1 reproducibility
AB Background: the purpose of this study was to analyze the reliability of a field-based fitnesstest battery in young trained football players, according to biological age. Methods: 197 youngtrained football players (12–19 years old) participated in the study. We measured anthropometricmeasurements (i.e., height, sitting height, length leg, and body mass), a bilateral vertical jumpingtest (CMJ), a progressive loading test of squats and hip thrust, acceleration and speed tests (10 mand 30 m sprint tests), a change-of-direction ability test (V–cut test), and a cardiorespiratory fitnesstest (30–15 intermittent fitness test). Statistical data are shown as the mean ± standard deviationby PHV group in tests and retests. Test reliability was assessed through the intraclass correlationcoefficient (ICC), with an ICC above 0.9 being considered high. To evaluate accuracy and repeatability,standard error of measurement, coefficient of variation, and minimum detectable change at 90%were determined and Bland–Altman diagrams were used, establishing a statistical significance ofp < 0.05. Results: All of the tests showed non-significant differences between the test and retestin the pooled sample (p > 0.05). Furthermore, all of them presented a trivial effect size (<0.2)and high intraclass correlation coefficients (>0.9), which indicates the high reproducibility of thetests, despite some of them presenting a significant difference between trials (i.e., the CMJ, 10 msprint, V–cut, and squat tests). Low measurement errors were found for all tests (coefficient ofvariation [CV] = 4.39–9.39), except for the CMJ and the progressive loading test for squat and hipthrust exercises (CV = 12.2–21.11). Similar results were found irrespective of biological age group.Conclusions: All tests were reliable for the pooled sample as well as for the biological age groups.
PB MDPI
SN 2075-1729
YR 2024
FD 2024-11-08
LK http://hdl.handle.net/10498/35825
UL http://hdl.handle.net/10498/35825
LA eng
DS Repositorio Institucional de la Universidad de Cádiz
RD 10-nov-2026