Convergent validity and reliability of a novel repeated agility protocol in junior rugby league players

Nicholls, Anthony, Leicht, Anthony, Connor, Jonathan, Halliday, Aaron, and Doma, Kenji (2021) Convergent validity and reliability of a novel repeated agility protocol in junior rugby league players. F1000Research, 9. 624.

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Abstract

Background: : Rugby league involves repeated, complex, and high intensity change-of-direction (COD) movements with no existing test protocols that specifically assesses these multiple physical fitness components simultaneously. Thus, the current study examined the convergent validity of a repeated Illinois Agility (RIA) protocol with the repeated T-agility protocol, and the repeatability of the RIA protocol in adolescent Rugby League players. Furthermore, aerobic capacity and anaerobic and COD performance were assessed to determine whether these physical qualities were important contributors to the RIA protocol.

Methods: Twenty-two junior Rugby League players completed 4 sessions with each separated by 7 days. Initially, physical fitness characteristics at baseline (i.e., Multi-stage Shuttle test, countermovement jump, 30-m sprint, single-effort COD and repeated sprint ability [RSA]) were assessed. The second session involved a familiarisation of RIA and repeated T-agility test (RTT) protocols. During the third and fourth sessions, participants completed the RIA and RTT protocols in a randomised, counterbalanced design to examine the validity and test-retest reliability of these protocols.

Results: For convergent validity, significant correlations were identified between RIA and RTT performances (r= >0.80; p<0.05). For contributors to RIA performance, significant correlations were identified between all baseline fitness characteristics and RIA (r = >0.71; p < 0.05). Reliability of the RIA protocol was near perfect with excellent intra-class correlation coefficient (0.87-0.97), good ratio limits of agreement (×/÷ 1.05-1.06) and low coefficient of variations (1.8-2.0%).

Conclusions: The current study has demonstrated the RIA to be a simple, valid and reliable field test for RL athletes that can provide coaches with information about their team’s ability to sustain high intensity, multi-directional running efforts.

Item ID: 71521
Item Type: Article (Research - C1)
ISSN: 2046-1402
Keywords: Change of direction, anaerobic power, sprint, speed, recovery rate
Copyright Information: Copyright: © 2021 Nicholls A et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Research Data: https://doi.org/10.25903/5eb0f568fad20
Date Deposited: 07 Feb 2022 22:35
FoR Codes: 42 HEALTH SCIENCES > 4207 Sports science and exercise > 420799 Sports science and exercise not elsewhere classified @ 100%
SEO Codes: 13 CULTURE AND SOCIETY > 1306 Sport, exercise and recreation > 130699 Sport, exercise and recreation not elsewhere classified @ 100%
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