Establishing the noise : interday ecological reliability of countermovement jump variables in professional rugby union players
Deutscher übersetzter Titel: | Ökologische Interday-Reliabilität von Variablen des Counter Movement Jumps bei professionellen Rugby-Union-Spielern |
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Autor: | Howarth, David J.; Cohen, Daniel Dylan; McLean, Blake D.; Coutts, Aaron James |
Erschienen in: | Journal of strength and conditioning research |
Veröffentlicht: | 36 (2022), 11, S. 3159-3166, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Elektronische Ressource (online) Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 1064-8011, 1533-4287 |
DOI: | 10.1519/JSC.0000000000004037 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU202211007578 |
Quelle: | BISp |
Abstract des Autors
The purpose of this study was to examine the interday “ecological” reliability of a wide range of ground reaction force–derived countermovement jump (CMJ) variables. Thirty-six male, professional rugby union players performed 3 CMJs on 4 separate days over an 8-day period during the first week of preseason. We calculated reliability for 86 CMJ variables across 5 interday combinations using 2 criteria: mean output across 3 jump trials (Mean 3) and single output from the highest jump (Best JH). Interday coefficient of variation (CV) of the 86 variables in each CMJ phase, for Mean 3 and Best JH, respectively, ranged between concentric = 2–11% and 2–13%; eccentric = 1–45% and 1–107%; and landing = 4–32% and 6–45%. Mean 3 interday CV was lower in all 86 variables across every interday combination, compared with Best JH . CVs were lower in our cohort than previous studies, particularly for eccentric phase variables. There was no meaningful difference between interday conditions, suggesting any 2-day combination conducted within the first 8 days of preseason, represents a measure of “noise.” We did not apply arbitrary reliability “cut-offs” used in previous work (e.g., CV <10%); therefore, our analysis provides reference reliability for a wide range of CMJ variables. However, we recommend that practitioners assess reliability in their athletes, as it is likely to be environment, protocol, and cohort specific.