Department of Kinesiology and Sport Sciences, University of Nebraska at Kearney, Kearney, NE, USA.
Department of Kinesiology and Health Studies, University of Central Oklahoma, Edmond, OK, USA.
J Musculoskelet Neuronal Interact. 2021 Jun 1;21(2):206-214.
The purpose of this study was to examine the effects of a competitive soccer season on rapid activation properties of the knee extensors and flexors in Division II female soccer players.
Eighteen collegiate female soccer players participated in the present study, however, due to injuries during the season a final sample of 16 players were included for study analysis. Participants performed two maximal voluntary isometric contractions (MVICs) of the knee extensors and flexors before, during, and at the end of a competitive college soccer season. Electromyography root mean square (EMG RMS; μV), rate of EMG rise (RER; %Peak EMG•s), and electromechanical delay (EMD; ms) were examined on both legs for the knee extensors and flexors.
EMG RMS at early time intervals (0-50, 0-100, and 50-100 ms) and RER at 0-75 ms for the knee extensors and flexors significantly increased from the pre-season to the end of the season (P≤0.010-0.026, η=0.36-0.81). EMD of the knee flexors significantly decreased at the mid-season and the end of the season compared to the pre-season (P<0.001, η=0.95).
These findings may have important implications for monitoring improvements on thigh neuromuscular activation and developing lower extremity injury prevention strategies during a competitive collegiate female soccer season.
本研究旨在探讨女子二级足球运动员整个赛季的竞争性足球比赛对膝关节伸肌和屈肌快速激活特性的影响。
共有 18 名大学生女子足球运动员参与了本研究，但由于赛季中受伤，最终有 16 名运动员进入研究分析。参与者在一个竞争激烈的大学足球赛季前、中、后进行了两次最大自主等长收缩（MVIC）的膝关节伸肌和屈肌。对膝关节伸肌和屈肌的双侧肌肉进行肌电图均方根（EMG RMS；μV）、肌电图上升率（RER；%Peak EMG•s）和机电延迟（EMD；ms）的检测。
膝关节伸肌和屈肌在早期时间间隔（0-50、0-100 和 50-100 ms）的 EMG RMS 和 0-75 ms 的 RER 在赛季前到赛季末显著增加（P≤0.010-0.026，η=0.36-0.81）。与赛季前相比，膝关节屈肌的 EMD 在赛季中期和赛季末明显降低（P<0.001，η=0.95）。
这些发现可能对监测女子二级足球运动员整个赛季大腿神经肌肉激活的改善以及制定下肢损伤预防策略具有重要意义。
