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Identifying and reporting position-specific countermovement jump outcome and phase characteristics within rugby league

The countermovement jump (CMJ) has been suggested to be an important test of neuromuscular performance for rugby league (RL) players. Identifying force platform-derived CMJ variables that may be more applicable to RL positions (e.g., forwards and backs) has yet to be fully explored in the scientific...

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Autores principales: McMahon, John J., Lake, Jason P., Comfort, Paul
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8956158/
https://www.ncbi.nlm.nih.gov/pubmed/35333887
http://dx.doi.org/10.1371/journal.pone.0265999
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author McMahon, John J.
Lake, Jason P.
Comfort, Paul
author_facet McMahon, John J.
Lake, Jason P.
Comfort, Paul
author_sort McMahon, John J.
collection PubMed
description The countermovement jump (CMJ) has been suggested to be an important test of neuromuscular performance for rugby league (RL) players. Identifying force platform-derived CMJ variables that may be more applicable to RL positions (e.g., forwards and backs) has yet to be fully explored in the scientific literature. The aim of this study was to identify RL position-specific CMJ force-time variables. Specifically, we aimed to compare select force-time variables from the countermovement (i.e., the combination of unweighting and braking) and propulsion phases of the CMJ between the global forwards and backs positional groups. We also aimed to compare typical (i.e., jump height) and alternative (i.e., take-off momentum) outcome CMJ variables between positional groups. Finally, we sought to visually present each individual player’s CMJ performance alongside the average data to facilitate the interpretation and reporting of the CMJ performances of RL athletes. Twenty-seven forwards and twenty-seven backs who competed in the senior men’s English RL Championship, performed three CMJs on a force platform at the beginning of the pre-season training period. There were no significant differences in any countermovement or propulsion phase variable between positions with just small effect sizes noted (P ≥0.09, d ≤0.46). Jump height (and so take-off velocity) was significantly greater for backs with moderate effects displayed (P = 0.03, d = 0.60). Take-off momentum (take-off velocity × body mass) was largely and significantly greater for forwards (P<0.01, d = 1.01). There was considerable overlap of individual player’s body mass and CMJ outcome variables across positions, despite significant differences in the mean values attained by each positional group. The results suggest that it may be beneficial for RL practitioners to identify player-specific, or at least position-specific, variables. As a minimum, it may be worthwhile selecting CMJ force-time variables based on what is considered important to individual player’s or small clusters of similar players’ projected successes during RL competition.
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spelling pubmed-89561582022-03-26 Identifying and reporting position-specific countermovement jump outcome and phase characteristics within rugby league McMahon, John J. Lake, Jason P. Comfort, Paul PLoS One Research Article The countermovement jump (CMJ) has been suggested to be an important test of neuromuscular performance for rugby league (RL) players. Identifying force platform-derived CMJ variables that may be more applicable to RL positions (e.g., forwards and backs) has yet to be fully explored in the scientific literature. The aim of this study was to identify RL position-specific CMJ force-time variables. Specifically, we aimed to compare select force-time variables from the countermovement (i.e., the combination of unweighting and braking) and propulsion phases of the CMJ between the global forwards and backs positional groups. We also aimed to compare typical (i.e., jump height) and alternative (i.e., take-off momentum) outcome CMJ variables between positional groups. Finally, we sought to visually present each individual player’s CMJ performance alongside the average data to facilitate the interpretation and reporting of the CMJ performances of RL athletes. Twenty-seven forwards and twenty-seven backs who competed in the senior men’s English RL Championship, performed three CMJs on a force platform at the beginning of the pre-season training period. There were no significant differences in any countermovement or propulsion phase variable between positions with just small effect sizes noted (P ≥0.09, d ≤0.46). Jump height (and so take-off velocity) was significantly greater for backs with moderate effects displayed (P = 0.03, d = 0.60). Take-off momentum (take-off velocity × body mass) was largely and significantly greater for forwards (P<0.01, d = 1.01). There was considerable overlap of individual player’s body mass and CMJ outcome variables across positions, despite significant differences in the mean values attained by each positional group. The results suggest that it may be beneficial for RL practitioners to identify player-specific, or at least position-specific, variables. As a minimum, it may be worthwhile selecting CMJ force-time variables based on what is considered important to individual player’s or small clusters of similar players’ projected successes during RL competition. Public Library of Science 2022-03-25 /pmc/articles/PMC8956158/ /pubmed/35333887 http://dx.doi.org/10.1371/journal.pone.0265999 Text en © 2022 McMahon et al https://creativecommons.org/licenses/by/4.0/This is an open access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/) , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Research Article
McMahon, John J.
Lake, Jason P.
Comfort, Paul
Identifying and reporting position-specific countermovement jump outcome and phase characteristics within rugby league
title Identifying and reporting position-specific countermovement jump outcome and phase characteristics within rugby league
title_full Identifying and reporting position-specific countermovement jump outcome and phase characteristics within rugby league
title_fullStr Identifying and reporting position-specific countermovement jump outcome and phase characteristics within rugby league
title_full_unstemmed Identifying and reporting position-specific countermovement jump outcome and phase characteristics within rugby league
title_short Identifying and reporting position-specific countermovement jump outcome and phase characteristics within rugby league
title_sort identifying and reporting position-specific countermovement jump outcome and phase characteristics within rugby league
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8956158/
https://www.ncbi.nlm.nih.gov/pubmed/35333887
http://dx.doi.org/10.1371/journal.pone.0265999
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