The reliability of a modified 505 test and change-of-direction deficit time in elite youth football players. Issue 2 (3rd April 2019)

• Record Type: Journal Article
• Authors: Taylor, Jonathan M.; Cunningham, Louis; Hood, Peter; Thorne, Ben; Irvin, Greg; Weston, Matthew
• Is Part Of: Science and medicine in football. Volume 3:Issue 2(2019)
• Page Start: 157
• Page End: 162
• Publication Date: 2019-04-03
• Subjects: Peak height velocity -- soccer -- fitness testing -- variability; Soccer injuries -- Periodicals; Soccer -- Physiological aspects -- Periodicals; Sports medicine -- Periodicals; Soccer -- Psychological aspects -- Periodicals; 617.102763
• DOI: 10.1080/24733938.2018.1526402
• Languages: English
• ISSNs: 2473-3938

Abstract

ABSTRACT: Change-of-direction ability is an important performance skill in football. Consequently, several testing protocols are used to assess this component. This study assessed the test–retest reliability of a modified 505 test (M505) and the change-of-direction deficit (CODD) in elite youth football players. Data were collected from 110 players from the Under [u] 12–18 years age groups (u18 n = 26, u16 n = 26, u14 n = 39, u12 n = 19) within two English Premier League Category 1 Football Academies. Players completed the M505 twice in 7-days, and a 10-m sprint test for CODD calculation. Reliability was assessed with respect to chronological and biological age (according to PHV status). Typical error (%), minimal detectable change (MDC) (%) and intraclass correlation coefficients (ICCs) were calculated. Typical errors in M505 were moderate to large (2.0–3.2%), while ICCs ranged from low to high ( r = 0.26–0.82). Typical errors in CODD were moderate to large (7.1–12.0%), with low to high ICC's ( r = 0.19–0.79). MDC's were 5.5 to 8.9% in M505 and 17.7 to 33.3% in CODD. The typical errors and MDC's observed indicate that the M505 and CODD tests have limited practical utility in elite youth football players.