Although normalizing the EMG signals is necessary for physiological interpretation and comparison between muscles and between subjects, no EMG study has investigated the standardized position to achieve maximal contraction for the adductor magnus muscle. Accordingly, it is necessary to employ a maximum voluntary isometric contraction (MVIC) position that elicits the highest activation to increase the validity of EMG studies and provide accurate comparisons between studies. Therefore, the purpose of this study was to compare the peak electromyography (EMG) of the most commonly used positions in the literature (i.e., the fully extended hip and knee, hip-flexed 45°, and knee at 90°) to a novel position: prone hip extension with 90° knee flexion. An ultrasound imaging system was used to guide the surface EMG electrode placement on the adductor magnus (AM) muscle, for a group of ninety-four recreational runners. AM demonstrated the greatest MVIC activity in both prone and hip-flexed 45° positions with no significant differences between them (p < 0.05). However, significant differences were displayed between the AM activities while performing the fully extended hip position and the other two positions. Based on these results, it is recommended that the prone and hip-flexed 45° positions can be used to measure the MVIC of the AM interchangeably. Furthermore, the prone position can be considered to be a position of the greatest MVIC of AM, particularly when the position of hip-flexed 45° is limited as well as it can be used to quantify MVIC for both AM and hip extensor muscles simultaneously.

中文翻译：

---

三种不同临床测试位置的收肌神经元肌电振幅的比较

尽管将EMG信号标准化对于肌肉之间以及受试者之间的生理解释和比较是必要的，但尚无EMG研究调查标准化位置以实现内收肌的最大收缩。因此，有必要采用最大自愿等距收缩（MVIC）位置，该位置引起最高激活，以增加EMG研究的有效性并提供研究之间的准确比较。因此，本研究的目的是比较文献中最常用的峰值肌电图（EMG）（即，髋部和膝盖完全伸展，髋部弯曲45度和膝部90度）位置：俯卧臀部伸展，膝盖弯曲90度。超声成像系统用于指导一组94名休闲跑步者在肌内收肌（AM）上的表面肌电电极的放置。AM在俯卧和髋屈45°位置均表现出最大的MVIC活性，两者之间无显着差异（p <0.05）。但是，在进行完全伸展的髋部姿势和其他两个姿势时，AM活动之间显示出显着差异。根据这些结果，建议俯卧和髋屈45°位置可互换使用，以测量AM的MVIC。此外，俯卧位可以认为是AM最大MVIC的位置，