Burghardt William P, Pfeiffer Karin A, Kuenze Chris
Department of Kinesiology, Michigan State University, East Lansing, Michigan.
J Strength Cond Res. 2023 Apr 1;37(4):816-822. doi: 10.1519/JSC.0000000000004325. Epub 2022 Jul 21.
Burghardt, WP, Pfeiffer, KA, and Kuenze, C. Assessing the relationship between external workloads and noncontact injuries during summer conditioning and preseason practice in National Collegiate Athletic Association Division 1 football players. J Strength Cond Res 37(4): 816-822, 2023-The purpose of this study was to prospectively investigate the relationship between noncontact injuries and workload in collegiate football during summer conditioning and preseason training. Workload and noncontact injury data were collected over the summer conditioning and preseason practice periods for a Division 1 National Collegiate Athletic Association football team ( n = 34). Seven- and 21-day exponentially weighted moving averages (EWMA) were calculated daily for each athlete. The acute:chronic ratio (A:C ratio) of these 2 measures was also calculated daily. Injury rates for noncontact injuries were calculated for both periods. Continuous variable modeling (panel logistic regression and restricted cubic spline) was used to assess the relationship of EWMA A:C ratio and noncontact injury using a 3-day lag period. Athletic exposures (AEs) were defined as individual sport training, practice, or competition sessions. Nine injuries were observed (6.97/1,000 AEs), with 4 injuries resulting in lost time (3.09/1,000 AEs). The mean EWMA A:C ratio was 0.92 ± 0.41 (95% confidence interval: 0.03-2.09). Both the panel logistic regression and the restricted cubic spline models showed a significant relationship between EWMA A:C ratio and noncontact injuries. However, the odds ratio (14.16) in the logistic regression had a very large standard error (14.51) and a wide 95% confidence interval (1.90-105.49). The restricted cubic spline model had a pseudo R2 of 0.136. Injury occurrence at given EWMA ratio values was lower than reported in previous research. Although both continuous models demonstrated a significant relationship between the EWMA A:C ratio and subsequent noncontact injuries over the next 3 days, neither model had sufficient goodness of fit to warrant adoption at this time.
布尔哈特、WP、普费弗、KA和昆策、C。评估美国国家大学体育协会第一分区橄榄球运动员夏季体能训练和季前赛期间外部负荷与非接触性损伤之间的关系。《力量与体能研究杂志》37(4): 816 - 822, 2023 - 本研究的目的是前瞻性调查大学橄榄球运动员在夏季体能训练和季前赛期间非接触性损伤与负荷之间的关系。在夏季体能训练和季前赛期间，收集了一支美国国家大学体育协会第一分区橄榄球队（n = 34）的负荷和非接触性损伤数据。每天为每位运动员计算7天和21天的指数加权移动平均值（EWMA）。还每天计算这两种测量方法的急性:慢性比值（A:C比值）。计算了两个时期非接触性损伤的发生率。使用连续变量建模（面板逻辑回归和受限立方样条），采用3天滞后时间来评估EWMA A:C比值与非接触性损伤之间的关系。运动暴露（AE）被定义为个人体育训练、练习或比赛场次。观察到9例损伤（6.97/1000 AE），其中4例损伤导致了训练时间损失（3.09/1000 AE）。平均EWMA A:C比值为0.92±0.41（95%置信区间：0.03 - 2.09）。面板逻辑回归模型和受限立方样条模型均显示EWMA A:C比值与非接触性损伤之间存在显著关系。然而，逻辑回归中的比值比（14.16）具有非常大的标准误差（14.51）和较宽的95%置信区间（1.90 - 105.49）。受限立方样条模型的伪R2为0.136。在给定EWMA比值值时的损伤发生率低于先前研究报告的水平。虽然两个连续模型都表明EWMA A:C比值与接下来3天的后续非接触性损伤之间存在显著关系，但此时没有一个模型具有足够的拟合优度来值得采用。
