Validação e reprodutibilidade do basketball change of direction speed test (B-Cods test)

Abstract

Introduction: Among the various athletic demands found in basketball, agility is one of the main ones. Although there is a plethora of agility tests, both planned and reactive, no protocol was found in the current literature that meets the specific characteristics of the movements performed during a basketball game. OBJECTIVE: to determine the validity and reliability of a new planned agility test for basketball called the Basketball Change of Direction Speed Test (B-CoDS Test). METHODS: a sample composed of 52 male basketball players (age = 18.1 ± 4.0) were evaluated for body mass, height, and performance in the 20 m sprint, Line Drill Test, B-CoDS Test, and Agility T Test. Validity was tested through simple and multiple linear regression analyses. Intraday and interday reliability analyses were performed using Student's paired t-test, intraclass correlation (ICC3,1), typical error of measurement (TEM), smallest worthwhile change (SWC), percentage coefficient of variation (CV%), Cohen’s effect size and Bland-Altman plot. RESULTS: the athletes completed the tests in 12.91 ± 0.72 s and 11.16 ± 0.53 s (B-CoDS Test and Agility T Rest, respectively). Simple linear regression between these two tests showed R² = 0.66 (p < 0.001) and standard error of the estimate of ± 0.31 s. In the predictive model of multiple linear regression, only the Line Drill Test was significant (R² = 0.41; p < 0.001), with the regression equation determined as B-CoDS = 4.03 + 0.288(LDT) ± 0.55. Intraday reliability showed a mean difference between the two attempts of 0.04 ± 0.19 s (95% CI = -0.02 to 0.09 s), ICC3.1 = 0.97 (95% CI = 0.95 to 0.98), ETM = 0.13 and CV% = 3.7%. The mean interday trial differences were 0.02 ± 0.16 s (95% CI = -0.29 to 0.33 s), ICC3.1 = 0.98 (95% CI = 0.96 to 0.99), ETM = 0.11, and CV% = 5.4%. The effect size was below 0.20 (trivial) in both analyses. CONCLUSION: The B-CoDS Test is a valid, reliable, and sensitive protocol for detecting performance changes when assessing planned agility in basketball athletes, in addition to being low-cost, easy to operate, and meeting the specificities of the sport.