Centre for Human Performance, School of Medical and Health Sciences, Edith Cowan University, Joondalup, WA, Australia.
Institute for Health Research, University of Notre Dame Australia, Fremantle, WA, Australia.
J Sports Sci Med. 2022 Sep 1;21(3):458-464. doi: 10.52082/jssm.2022.458. eCollection 2022 Sep.
This study investigated the effects of reduced quarter time due to COVID-19 pandemic rule changes, on running performance and injuries in Australian Football. Microsensor data for eight matches performed by the same 17 players were compared between the 2019 (standard) and 2020 (COVID-19) seasons using linear and generalised mixed models. Injury rates were assessed in 34 players across the full 2019 season, and 32 players across the full 2020 season. The total distance (ES = 1.28 [0.55 to 2.02]), high-speed (>18 km/h) (ES = 0.44 [-0.24 to 1.12]) and very highspeed (>24 km/h) (ES = 0.27 [-0.41 to 0.94]) distances, PlayerLoad™ (ES = 0.96 [0.25 to 1.67]), high-intensity efforts (ES = 0.48 [-0.20 to 1.16]), and accelerations (ES = 0.33 [-0.34 to 1.01]) were smaller ( ≤ 0.01) for the 2020 than the 2019 season. Expressed relative to playing time, distance (ES=-0.38 [-1.06 to 0.30]), PlayerLoad™ (ES = -0.27 [-0.94 to 0.41]), and acceleration efforts (ES = -0.50 [-1.18 to 0.18]) were greater ( < 0.05) for the 2020 than the 2019 season. No significant differences in maximum ball-in-play periods nor the difference between the 1 and 4 quarters were evident. Injury rates remained similar between 2019 (3.36 per game) and 2020 (3.55 per game). However, the proportion of injuries that led to lost time (missed games) was greater for the 2020 (38%) than 2019 season (24%). The changes in the rules had a profound impact on player performance and increased the likelihood of time loss injuries.
本研究调查了因 COVID-19 大流行规则改变而减少四分之一时间对澳大利亚足球跑动表现和受伤的影响。使用线性和广义混合模型比较了 17 名相同球员在 2019 年（标准）和 2020 年（COVID-19）赛季的 8 场比赛的微传感器数据。在整个 2019 赛季评估了 34 名球员的受伤率，在整个 2020 赛季评估了 32 名球员的受伤率。总距离（ES = 1.28 [0.55 至 2.02]）、高速（>18 公里/小时）（ES = 0.44 [-0.24 至 1.12]）和超高速度（>24 公里/小时）（ES = 0.27 [-0.41 至 0.94]）距离、PlayerLoad™（ES = 0.96 [0.25 至 1.67]）、高强度努力（ES = 0.48 [-0.20 至 1.16]）和加速度（ES = 0.33 [-0.34 至 1.01]）在 2020 年比 2019 年更小（≤0.01）。与比赛时间相比，距离（ES=-0.38 [-1.06 至 0.30]）、PlayerLoad™（ES = -0.27 [-0.94 至 0.41]）和加速度努力（ES = -0.50 [-1.18 至 0.18]）在 2020 年大于（<0.05）2019 年。在最大比赛时间和第 1 节和第 4 节之间的差异方面，没有明显的差异。2019 年（每场比赛 3.36 次）和 2020 年（每场比赛 3.55 次）的受伤率相似。然而，导致错失比赛（缺赛）的受伤比例在 2020 年（38%）高于 2019 年（24%）。规则的改变对球员表现产生了深远的影响，并增加了受伤时间损失的可能性。
