Proceedings of the 12th International Conference on Kinanthropology. Sport and Quality of Life. 7. – 9. 11. 2019Kapitola
Reliability and validity of the newly developed tests of football specific change of direction speed and reactive agility in youth playersRok vydání: 2020
Purpose: Agility is an important determinant of success in football (soccer), but there is a lack of reliable and valid tests applicable in the evaluation of different agility components in youth football players. In this study we evaluated the reliability and factorial validity of the two newly developed tests of agility in male youth football players.<br />Methods: The sample comprised 44 youth football players (all males, 14–15 years of age) who were tested on anthropometrics (body height and mass), newly developed tests of foot-ball specific reactive agility (FS-RAG) and change of direction speed (FS-CODS), one stand-ard test of CODS (20-yards), and sprinting over 20-m distance (S20M). The relative reliability is evaluated by calculation of Intra-Class-Correlation coeficients (ICC), while the absolute reliability was evaluated by calculation of the coeficient of variation (CV). Further, systematic bias was checked by analysis of variance for repeated measurements (ANOVA). The asso-ciations between studied variables were evidenced by Pearson’s correlation. Finally, factor analysis was calculated to define the factorial validity of agility tests (FS-RAG, FS-CODS, 20-yards).<br />Results: The newly developed football-specific tests were found to be reliable, with better re-liability of FS-CODS (ICC: 0.81, CV: 6%), than of FS-RAG (ICC: 0.76, CV: 9%). The ANOVA evidenced significant (p < 0.05) learning effects for FS-RAG, but post-hoc analysis indicated stabilization of the results until the third testing trial. Factor analysis extracted one significant factor under the Guttmann-Kaiser criterion (Explained Variance: 1.67), showing the appro-priate factorial validity of newly developed tests in comparison to standard agility indicator 20-yards. Meanwhile, the significant correlations between all agility performances with S20M (Pearson’s R: 0.52–0.63; all p < 0.01) revealed that sprinting capacity significantly influence agility performances and that conditioning capacities of youth football players are not yet discriminated.<br />Conclusion: Results showed appropriate reliability and validity of the newly developed tests of football specific change of direction speed and reactive agility. Therefore, here proposed FS-CODS and FS-RAG can be used as reliable and valid measures of agility components in youth football players. Further studies should evaluate the discriminative validity of the here proposed tests (i.e. identification of position-specific or performance-related differences), as well as reliability in younger players than those studied herein.
soccer; agility; sport-specific tests; reliability; validity
Bangsbo, J. (1992). Time and motion characteristics of competitive soccer. Science and football(6), 34–42.
Benvenuti, C., Minganti, C., Condello, G., Capranica, L., & Tessitore, A. (2010). Agility assessment in female futsal and soccer players. Medicina-Lithuania, 46(6), 415–420. https://doi.org/10.3390/medicina46060058
Freitas, T. T., Alcaraz, P. E., Bishop, C., Calleja-Gonzalez, J., Arruda, A. F. S., Guerriero, A., . . . Loturco, I. (2019). Change of Direction Deficit in National Team Rugby Union Players: Is There an Influence of Playing Position? Sports, 7(1). https://doi.org/10.3390/sports7010002
Gabbett, T. J. (2006). A comparison of physiological and anthropometric characteristics among playing positions in sub-elite rugby league players. Journal of Sports Sciences, 24(12), 1273– 1280. https://doi.org/10.1080/02640410500497675
Pojskic, H., Åslin, E. V., Krolo, A., Jukić, I., Uljevic, O., Spasić, M., & Sekulic, D. (2018). Importance of reactive agility and change of direction speed in differentiating performance levels in junior soccer players: reliability and validity of newly developed soccer-specific tests. Frontiers in Physiology, 9, 506. https://doi.org/10.3389/fphys.2018.00506
Sekulic, D., Pehar, M., Krolo, A., Spasic, M., Uljevic, O., Calleja-González, J., & Sattler, T. (2017). Evaluation of basketball-specific agility: applicability of preplanned and nonplanned agility performances for differentiating playing positions and playing levels. The Journal of Strength & Conditioning Research, 31(8), 2278–2288. https://doi.org/10.1519/JSC.0000000000001646
Sheppard, J. M., & Young, W. B. (2006). Agility literature review: Classifications, training and testing. Journal of Sports Sciences, 24(9), 919–932. https://doi.org/10.1080/02640410500457109
Sisic, N., Jelicic, M., Pehar, M., Spasic, M., & Sekulic, D. (2016). Agility performance in high-level junior basketball players: the predictive value of anthropometrics and power qualities. J Sports Med Phys Fitness, 56(7–8), 884–893.
Sporis, G., Jukic, I., Milanovic, L., & Vucetic, V. (2010). Reliability and factorial validity of agility tests for soccer players. The Journal of Strength & Conditioning Research, 24(3), 679–686. https://doi.org/10.1519/JSC.0b013e3181c4d324
Uljevic, O., Spasic, M., & Sekulic, D. (2013). Sport-Specific Motor Fitness Tests in Water Polo: Reliability, Validity and Playing Position Differences. Journal of Sports Science and Medicine, 12(4), 646–654.
Wisloeff, U., Helgerud, J., & Hoff, J. (1998). Strength and endurance of elite soccer players. Medicine and Science in Sports and Exercise, 30(3), 462–467. https://doi.org/10.1097/00005768-199803000-00019