Abstract：
Background and Objectives: The purpose of this study was to investigate the activity of bilateral cervical extensors and flexors on the sagittal, frontal, and horizontal planes of healthy adults during motions of the neck in a sitting position, which has not been satisfactorily investigated by surface electromyogram (sEMG). Materialand Methods: We recruited 35 healthy participants (mean ± standard deviation of age, 20.3 ± 2.4). sEMG recordings of the cervical extensors and flexors were performed for a total of nine seconds in three phases: Phase I involved the motion of the neck from the neutral position to the maximum range of motion; Phase II involved maintaining the neck at the maximum range of motion; and Phase III involved the motion of the neck from the maximum range of motion to the neutral position during neck flexion, extension, right and left lateral flexion, right and left rotation, and maintaining the neck in the neutral position. Muscle activities in each motion were normalized as a percentage of maximal voluntary contraction (%MVC) so that the muscles could be compared. Results: The %MVC of the extensors was significantly larger than that of the flexors in the neutral position (p < 0.001). In addition, the %MVCs of the following were significantly larger than the %MVC in the neutral position: the extensors in flexion (p = 0.014) and extension (p = 0.020), the ipsilateral extensors (p = 0.006) and flexors (p < 0.001) in lateral flexion in Phase I; the flexors in flexion (p < 0.001), the extensors in extension (p = 0.010), and the ipsilateral extensors and flexors in lateral flexion (p < 0.001) in Phase II; the extensors and flexors in flexion (p < 0.001), the flexors in extension (p < 0.001), the ipsilateral flexors (p < 0.001), the contralateral flexors (p = 0.004) and the contralateral extensors (p = 0.018) in lateral flexion in Phase III; and the bilateral extensors and contralateral flexors during rotation in all three phases (p < 0.001). Conclusion: The typical sEMG activities of the extensors and flexors during motion of the neck in healthy adults were identified in this study; this information can be used to understand the pathophysiology of non-specific neck pain and to provide an index for evaluating the effect of treatment.
摘要：
背景和目的:本研究的目的是探讨双侧颈椎伸肌和屈肌在矢状面上的活动,额叶,和健康成年人在坐姿颈部运动期间的水平面，尚未通过表面肌电图（sEMG）进行令人满意的研究。材料和方法：我们招募了35名健康参与者(年龄的平均值±标准差，20.3±2.4)。sEMG记录颈椎伸肌和屈肌的三个阶段共进行了9秒：第一阶段涉及颈部从中立位置到最大运动范围的运动；第二阶段涉及将颈部保持在最大运动范围；第三阶段涉及颈部屈曲过程中颈部从最大运动范围到中立位置的运动，扩展,左右外侧屈曲,左右旋转，并将颈部保持在中立位置。将每个运动中的肌肉活动标准化为最大自愿收缩的百分比（％MVC），以便可以比较肌肉。结果：在中立位置，伸肌的％MVC明显大于屈肌（p<0.001）。此外,以下％的MVCs明显大于％MVC在中立位置：伸肌屈曲（p=0.014）和伸展（p=0.020），同侧伸肌（p=0.006）和屈肌（p<0.001）在侧屈时在I期；屈肌（p<0.001），延伸中的延伸子(p=0.010)，和同侧伸肌和屈肌在侧屈时（p<0.001）在II期；伸肌和屈肌在屈曲（p<0.001），屈肌伸展(p<0.001)，同侧屈肌（p<0.001），对侧屈肌（p=0.004）和对侧伸肌（p=0.018）在III期，以及在所有三个阶段旋转的双侧伸肌和对侧屈肌（p<0.001）。结论：本研究确定了健康成人颈部运动过程中伸肌和屈肌的典型sEMG活动；该信息可用于了解非特异性颈部疼痛的病理生理并为评估治疗效果提供指标。
