title: Validity and reliability of new agility test among elite and subelite under 14-soccer players.
abstract: BACKGROUND
  Agility is a determinant component in soccer performance. This study aimed to evaluate the reliability and sensitivity of a "Modified Illinois change of direction test" (MICODT) in ninety-five U-14 soccer players.
  
  
  METHODS
  A total of 95 U-14 soccer players (mean ± SD: age: 13.61 ± 1.04 years; body mass: 30.52 ± 4.54 kg; height: 1.57 ± 0.1 m) from a professional and semi-professional soccer academy, participated to this study. Sixty of them took part in reliability analysis and thirty-two in sensitivity analysis.
  
  
  RESULTS
  The intraclass correlation coefficient (ICC) that aims to assess relative reliability of the MICODT was of 0.99, and its standard error of measurement (SEM) for absolute reliability was <5% (1.24%). The MICODT's capacity to detect change is "good", it's SEM (0.10 s) was ≤ SWC (0.33 s). The MICODT is significantly correlated to the Illinois change of direction speed test (ICODT) (r = 0.77; p<0.0001). The ICODT's MDC95 (0.64 s) was twice about the MICODT's MDC95 (0.28 s), indicating that MICODT presents better ability to detect true changes than ICODT. The MICODT provided good sensitivity since elite U-14 soccer players were better than non-elite one on MICODT (p = 0.005; dz = 1.01 [large]). This was supported by an area under the ROC curve of 0.77 (CI 95%, 0.59 to 0.89, p<0.0008). The difference observed in these two groups in ICODT was not statistically significant (p = 0.14; dz = 0.51 [small]), showing poor discriminant ability.
  
  
  CONCLUSIONS
  MICODT can be considered as more suitable protocol for assessing agility performance level than ICODT in U-14 soccer players.
authors.affiliation: Research Unit: Analyse et Évaluation des Facteurs Affectant la Performance Sportive, Institut Supérieur du Sport et de l'Éducation Physique, Ksar Said, Tunisia. Université de la Manouba, Tunis, Tunisia.
authors.forename: Younés
authors.initials: Y
authors.lastname: Hachana
authors.affiliation: Tunisian Research Laboratory "Sport Performance Optimization," National Centre of Medicine and Science in Sports (CNMSS), Tunis, Tunisia.
authors.forename: Helmi
authors.initials: H
authors.lastname: Chaabène
authors.affiliation: Research Unit: Analyse et Évaluation des Facteurs Affectant la Performance Sportive, Institut Supérieur du Sport et de l'Éducation Physique, Ksar Said, Tunisia. Université de la Manouba, Tunis, Tunisia.
authors.forename: Ghada
authors.initials: G
authors.lastname: Ben Rajeb
authors.affiliation: Research Unit: Analyse et Évaluation des Facteurs Affectant la Performance Sportive, Institut Supérieur du Sport et de l'Éducation Physique, Ksar Said, Tunisia. Université de la Manouba, Tunis, Tunisia.
authors.forename: Riadh
authors.initials: R
authors.lastname: Khlifa
authors.affiliation: Research Unit: Analyse et Évaluation des Facteurs Affectant la Performance Sportive, Institut Supérieur du Sport et de l'Éducation Physique, Ksar Said, Tunisia. Université de la Manouba, Tunis, Tunisia.
authors.forename: Ridha
authors.initials: R
authors.lastname: Aouadi
authors.affiliation: Athlete Health and Performance Research Centre, ASPETAR, Qatar Orthopaedic and Sports Medicine Hospital, Doha, Qatar.
authors.forename: Karim
authors.initials: K
authors.lastname: Chamari
authors.affiliation: School of Exercise Science, Australian Catholic University, Brisbane, Australia; School of Human Movement Studies, the University of Queensland, Brisbane, Australia.
authors.forename: Tim J
authors.initials: TJ
authors.lastname: Gabbett
mesh_terms: D000293:Adolescent; D054874:Athletic Performance / Q000502:physiology*; D002648:Child; D005080:Exercise Test / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D015203:Reproducibility of Results; D012916:Soccer
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