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• W4387444853 abstract "Introduction: Periodic testing is essential to evaluate changes in key physical and physiological characteristics in response to development strategies employed with adolescent rugby league players; however, the retest reliability of scientifically popular tests to assess these characteristics are yet to be comprehensively examined in this population. Reliability analyses of this nature are essential for practitioners to understand the inherent error in test outcomes when assessing changes, which is essential to appropriately monitor and inform long-term player development. Consequently, the aim of this study was to determine the retest reliability of the most commonly used tests in the literature, to assess key physical and physiological characteristics in adolescent, male rugby league players. Methods: A total of 51 male, adolescent, first-grade, rugby league players were recruited for this repeated-measures study (age: 16.8±0.9 years; height: 178.9±5.3 cm; body mass: 81.6±13.5 kg). The most frequently used tests reported in the literature to assess key physical and physiological characteristics were administered in accordance with NSCA guidelines on two separate occasions separated by seven days. Tests to assess physical characteristics included height (cm), body mass (kg), and sum of four skinfold sites (mm). Physiological characteristics and associated tests included: muscular power assessed using medicine ball throw (m) and countermovement jump (cm); and muscular strength assessed using one-repetition maximum (kg) bench press and back squat; linear speed assessed using 10-m sprint times (s); change-of-direction speed assessed using the 505-Agility test times (s, left and right foot); aerobic capacity assessed using predicted VO2max (mL·kg-1·min-1) from the Multistage Fitness Test. Within each testing week, tests of physical characteristics, muscular power and strength were administered in testing session 1, with remaining tests administered in testing session 2 48 h later. Identical testing protocols were performed at the same time of day in each week for analysis of retest reliability using intraclass correlation coefficient (ICC) and coefficient of variation (CV) statistics. Reliability outcomes were interpreted as follows for ICC: <0.50=poor; 0.50–0.74=moderate; 0.75–0.89=good; and >0.90=excellent. Results: All tests used to assess physical characteristics demonstrated excellent ICC (0.976–0.999), with CV ranging between 0.03–2.53%. Tests used to assess physiological characteristics demonstrated moderate to excellent ICC, with CV <5% including: linear speed, ICC=0.794, CV=1.35%; change-of-direction speed, ICC=0.787–0.860, CV=1.85–2.07%; aerobic capacity, ICC=0.854, CV=3.42%; muscular power, ICC=0.733–0.874, CV=3.72–4.02%; and muscular strength, ICC=0.944–0.988, CV=1.08–2.56%. Discussion: The most frequently used tests in the literature to assess key physical and physiological characteristics among adolescent, male rugby league players possessed moderate to excellent ICC and CV <5%. The present study provides comprehensive, novel data regarding the reliability of scientifically popular physical and physiological tests for rugby league practitioners to consider when deciding on a test battery for implementation based on the magnitude of error they are willing to accept. Impact/Application to the field: The provided reliability data may be used by rugby league practitioners working with adolescent players to understand the inherent error in common physical and physiological tests to better identify real changes in performance outputs and optimally tailor subsequent developmental strategies. Declaration: My co-authors and I acknowledge that we have no conflict of interest of relevance to the submission of this abstract." @default.
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• W4387444853 date "2023-10-01" @default.
• W4387444853 modified "2023-10-11" @default.
• W4387444853 title "The retest reliability of the most common tests used to assess key physical and physiological characteristics in male, adolescent rugby league players" @default.
• W4387444853 doi "https://doi.org/10.1016/j.jsams.2023.08.049" @default.
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