精英青年和高级澳大利亚国家橄榄球联赛比赛之间的比赛特点比较。
A comparison of game-play characteristics between elite youth and senior Australian National Rugby League competitions.
机构信息
Discipline of Sport and Exercise Science, James Cook University, Australia.
Institute of Sport, Exercise & Active Living (ISEAL), Victoria University, Australia.
出版信息
J Sci Med Sport. 2018 Jun;21(6):626-630. doi: 10.1016/j.jsams.2017.10.003. Epub 2017 Oct 12.
OBJECTIVES
To compare game-play characteristics between elite youth and senior Australian National Rugby League (NRL) competitions.
DESIGN
Longitudinal observational.
METHODS
The dataset consisted of 12 team performance indicators (e.g., 'all runs', 'offloads' and 'tackles') extracted from all 2016 national under 20 (U20) competition (elite youth; n=372 observations) and National Rugby League (NRL) (elite senior; n=378 observations) matches. Data was classified according to competition (Two levels: U20 and NRL) and modelled using two techniques. Firstly, non-metric multidimensional scaling resolved multivariate competition (dis)similarity, visualised using a two-dimensional ordination. Secondly, a conditional interference (CI) classification tree was grown to reveal the performance indicators most capable of explaining competition level.
RESULTS
Non-metric multidimensional scaling revealed high competition dissimilarity, with U20 and NRL teams orienting distinctive positions on the first dimension of the ordination surface. Five team performance indicators were retained within the CI tree ('all runs', 'tackle breaks', 'tackles', 'missed tackles', and 'kicks'), which correctly classified 79% of the U20 observations and 93% of the NRL observations.
CONCLUSIONS
Multivariate differences between elite youth and senior rugby league competitions were identified. Specifically, NRL game-play was classified by a greater number of 'all runs', and 'tackles' and a lower number of 'missed tackles' relative to the U20 competition. Given the national U20 competition is purported to assist with the development of prospective NRL players, junior coaches may consider training interventions that primarily aid the tackling capacities of players. This may subsequently assist with talent development and player progression in Australian rugby league.
目的
比较精英青年和高级澳大利亚国家橄榄球联盟（NRL）比赛的比赛特点。
设计
纵向观察。
方法
数据集由从所有 2016 年国家 20 岁以下（U20）比赛（精英青年；n=372 次观察）和国家橄榄球联盟（NRL）（精英高级；n=378 次观察）比赛中提取的 12 个团队绩效指标（例如，“所有跑动”，“传球”和“抢断”）组成。数据根据比赛（两个级别：U20 和 NRL）进行分类，并使用两种技术进行建模。首先，非度量多维尺度解析多元比赛（不）相似性，使用二维有序图进行可视化。其次，生长条件干扰（CI）分类树以揭示最能解释比赛水平的绩效指标。
结果
非度量多维尺度揭示了高度的竞争差异，U20 和 NRL 球队在有序图表面的第一个维度上定位独特的位置。CI 树中保留了五个团队绩效指标（“所有跑动”，“抢断突破”，“抢断”，“漏防”和“踢球”），正确分类了 79％的 U20 观察结果和 93％的 NRL 观察结果。
结论
确定了精英青年和高级橄榄球联赛比赛之间的多维差异。具体来说，与 U20 比赛相比，NRL 比赛的“所有跑动”和“抢断”次数更多，而“漏防”次数更少。鉴于全国 U20 比赛旨在协助培养未来的 NRL 球员，初级教练可能会考虑培训干预措施，主要帮助球员提高抢断能力。这可能随后有助于澳大利亚橄榄球联盟的人才发展和球员晋级。
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