Int J Sports Physiol Perform. 2019 Apr 1;14(4):421-425. doi: 10.1123/ijspp.2018-0466. Epub 2019 Feb 18.
To examine the association and predictive ability of internal load markers with regard to noncontact injuries in young elite soccer players.
Twenty-two soccer players (18.6 [0.6] y) who competed in the Spanish U19 League participated in the study. During a full season, noncontact injuries were recorded and, using session rating of perceived exertion, internal weekly load (sum of load of all training sessions and matches for each week) and acute:chronic workload ratio (typically, acute = current week and chronic = rolling 4-wk average) were calculated. A generalized estimating equation analysis was used to examine the association of weekly and acute:chronic load-ratio markers with a noncontact injury in the subsequent week. Load variables were also analyzed for predictive ability with receiver operating characteristic curve and area under the curve.
No association was found for weekly load (odds ratio = 1.00; 90% confidence interval, 0.99-1.00) and acute:chronic load ratio (odds ratio = 0.16; 90% confidence interval, 0.01-1.84) with respect to injury occurrence. In addition, the analyzed load markers showed poor ability to predict injury occurrence (area under the curve < .50).
The results of this study suggest that internal load markers are not associated with noncontact injuries in young soccer players and present poor predictive capacity with regard to the latter.
研究内部负荷标志物与年轻精英足球运动员非接触性损伤的关联及其预测能力。
22 名参加西班牙 U19 联赛的足球运动员（18.6[0.6]岁）参与了这项研究。在整个赛季中，记录了非接触性损伤的情况，并使用主观疲劳感觉评估量表计算了每周的内部负荷（所有训练和比赛的负荷总和）和急性：慢性工作负荷比（通常，急性=当周，慢性=滚动 4 周的平均值）。使用广义估计方程分析来检查每周和急性：慢性负荷比标志物与随后一周非接触性损伤的关联。还使用受试者工作特征曲线和曲线下面积来分析负荷变量的预测能力。
每周负荷（比值比=1.00；90%置信区间，0.99-1.00）和急性：慢性负荷比（比值比=0.16；90%置信区间，0.01-1.84）与损伤发生均无关联。此外，分析的负荷标志物预测损伤发生的能力较差（曲线下面积<.50）。
本研究结果表明，内部负荷标志物与年轻足球运动员的非接触性损伤无关，并且对后者的预测能力较差。
