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Test-Retest Reliability, Criterion-Related Validity, and Minimal Detectable Change of the Illinois Agility Test in Male Team Sport Athletes

Hachana, Younes1; Chaabène, Helmi2; Nabli, Mohamed A.1; Attia, Ahmed1; Moualhi, Jamel1; Farhat, Najiba3; Elloumi, Mohamed4

The Journal of Strength & Conditioning Research: October 2013 - Volume 27 - Issue 10 - p 2752–2759
doi: 10.1519/JSC.0b013e3182890ac3
Original Research

Hachana, Y, Chaabène, H, Nabli, MA, Attia, A, Moualhi, J, Farhat, N, and Elloumi, M. Test-retest reliability, criterion-related validity, and minimal detectable change of the Illinois agility test in male team sport athletes. J Strength Cond Res 27(10): 2752–2759, 2013—The purposes of this study were first to assess the reliability and criterion-related validity of the Illinois change of direction (COD) Illinois Agility Test (IAGT) and second to determine whether a relationship with power and speed exists. A total of 105 male team sport athletes participated in this investigation. Repeat measurements in 89 subjects out of the 105 were performed to assess the test-retest reliability and the 95% confidence interval (CI) of the difference in the score between paired observations (minimal detectable change [MDC]95) of the COD IAGT. The intraclass correlation coefficient and the SEM values for the COD IAGT test were 0.96 (95% CI, 0.85–0.98) and 0.19 seconds, respectively. The smallest worthwhile change (0.20 seconds) for the IAGT was greater than its SEM (0.19 seconds). The MDC95 value for the IAGT was 0.52 seconds. Criterion-related validity of the COD IAGT was assessed in the 105 subjects. They performed the COD IAGT and the T-test. Both tests were significantly correlated (r = 0.31 [95% CI, 0.24–0.39]; p < 0.05). The correlation between COD IAGT, acceleration, straight speed, and leg power was analyzed in all the 105 subjects. Pearson moment correlation revealed no association between acceleration and the COD IAGT. However, significant correlations were observed between the COD IAGT and leg power (r = −0.39 [95% CI, −0.26 to −0.44]; p < 0.05), and speed (r = 0.42 [95% CI, 0.37–0.51]; p < 0.05). When controlling for speed with partial correlation, the significant relationship between the COD IAGT and leg power disappeared. In conclusion, the COD IAGT seems to be a reliable and valid test, whose performance is significantly related to speed rather than to acceleration and leg power.

1Research Unit, Analysis and Evaluation of Factors Affecting the Sport Performance, Higher Institute of Sports and Physical Education, Ksar said, Tunisia;

2Tunisian Research Laboratory “Sport Performance Optimization,” National Center of Medicine and Science in Sport, Tunisia;

3Faculty of Medicine, “Iben El Jazzar,” University of Sousse, Sousse, Tunisia; and

4Laboraory of physiology, Faculty of Medicine “Iben El Jazzar,” Sousse, Tunisia

Address correspondence to Helmi Chaabène,

Copyright © 2013 by the National Strength & Conditioning Association.