Ylinen Jari, Nuorala Semi, Häkkinen Keijo, Kautiainen Hannu, Häkkinen Arja
Department of Physical and Rehabilitation Medicine, Jyväskylä Central Hospital, Keskussairaalantie 19, Jyväskylä 40620, Finland.
Clin Biomech (Bristol). 2003 Jul;18(6):467-72. doi: 10.1016/s0268-0033(03)00056-1.
To characterize isometric rotation strength in the neutral and in different prerotated positions of the neck.
This was a descriptive study involving maximal isometric strength measurements of the cervical musculature.
The literature contains only a few studies pertaining to strength levels of the neck rotator muscles in the neutral position. None of these studies have dealt in detail with maximal neck strength in selected prerotation positions.
Twenty healthy men volunteered as subjects. Maximal axial rotation strength of the neck muscles was measured in a neutral position and bilaterally at 30 degrees and 60 degrees rotation using the isometric neck strength measurement system. Isometric maximum voluntary contractions of the neck muscles in flexion and extension were also tested.
The highest strength values were not reached in the neutral position, but at the largest joint angles, while turning the head in the opposite direction from the prerotated position. Maximal strength increased with increasing angle, and at the 60 degrees prerotation angle it was 44% higher towards the right and 27% higher towards the left compared to the values obtained in the neutral position. The smallest strength values were also produced at the largest prerotation angles, but in the same direction.
The present results show a clear relationship between the prerotated position of the neck and maximal voluntary strength in rotation.
The data suggest that neck strength is highly prerotation angle dependent. Neck strength should be measured at several prerotation positions in addition to the neutral position in order to obtain the true strength values throughout the entire range of motion. Maximal neck rotation strength between subjects is differentiated best at the greatest prerotation angles.
描述颈部在中立位及不同预旋转位时的等长旋转力量。
这是一项描述性研究，涉及对颈部肌肉的最大等长力量测量。
文献中仅有少数关于颈部旋转肌在中立位力量水平的研究。这些研究均未详细探讨特定预旋转位时的最大颈部力量。
20名健康男性志愿者作为受试者。使用等长颈部力量测量系统，在中立位以及双侧30度和60度旋转位测量颈部肌肉的最大轴向旋转力量。还测试了颈部肌肉在屈伸时的等长最大自主收缩。
最高力量值并非在中立位达到，而是在最大关节角度时，即头部从预旋转位向相反方向转动时。最大力量随角度增加而增大，在60度预旋转角度时，与中立位相比，向右侧的最大力量高44%，向左侧高27%。最小力量值也出现在最大预旋转角度时，但方向相同。
目前的结果表明颈部预旋转位与旋转时的最大自主力量之间存在明显关系。
数据表明颈部力量高度依赖于预旋转角度。除中立位外，还应在多个预旋转位测量颈部力量，以便在整个运动范围内获得真实的力量值。在最大预旋转角度时，不同受试者之间的最大颈部旋转力量差异最为明显。
