Huang Q M, Andersson E, Thorstensson A
Department of Neuroscience, Karolinska Institutet, and the Department of Sport and Health Sciences, University College of Physical Education and Sports, Stockholm, Sweden.
Spine (Phila Pa 1976). 2001 Jul 1;26(13):1465-72. doi: 10.1097/00007632-200107010-00017.
Myoelectric activity of trunk muscles was measured intramuscularly in six healthy subjects as they maintained static trunk postures at 0 degrees, 15 degrees, and 30 degrees of lateral bending, unloaded or holding a 20-kg load in one hand alongside the body.
To determine the position and load dependency of the agonistic and antagonistic myoelectric responses of deep and superficial trunk lateral flexor muscles.
Loading of the trunk in lateral bending is associated with incidences of low back pain. The neuromotor control of muscles surrounding the spine may be decisive for its vulnerability. Earlier documentation of the activation pattern of trunk muscles, particularly those situated deeply, is incomplete.
Trunk angle was measured between S1-C7 and the vertical with a protractor. Electromyographic activity was recorded unilaterally from eight trunk muscles using intramuscular fine-wire electrodes inserted under the guidance of ultrasound.
The electromyographic data showed that all muscles on the side contralateral to the load, except rectus abdominis, had their highest activity while loaded in the position most laterally flexed to the loaded side. The degree of bilateral coactivation was greater for the ventral than for the dorsal muscles.
The myoelectric responses of most lumbar trunk muscles to static lateral flexion were dependent on trunk position and loading. The abdominal muscles demonstrated more coactivation than the other trunk muscles, and thus appeared to contribute more to trunk stabilization in laterally bent and loaded trunk positions.
在六名健康受试者保持静态躯干姿势时，于0度、15度和30度侧屈状态下，分别在无负荷或单手在身体一侧持20千克重物的情况下，通过肌内测量法测量其躯干肌肉的肌电活动。
确定深层和浅层躯干侧屈肌的主动和拮抗肌电反应的位置及负荷依赖性。
躯干侧屈时的负荷与下腰痛的发生率相关。脊柱周围肌肉的神经运动控制可能对其易损性起决定性作用。早期关于躯干肌肉，尤其是深层肌肉激活模式的记录并不完整。
使用量角器测量S1 - C7与垂直线之间的躯干角度。在超声引导下，通过肌内细针电极单侧记录八块躯干肌肉的肌电活动。
肌电数据显示，除腹直肌外，负荷对侧所有肌肉在向负荷侧最大程度侧屈的位置负荷时活动最高。腹侧肌肉的双侧共同激活程度高于背侧肌肉。
大多数腰椎躯干肌肉对静态侧屈的肌电反应取决于躯干位置和负荷。腹肌比其他躯干肌肉表现出更多的共同激活，因此在侧屈和负荷状态下的躯干位置似乎对躯干稳定贡献更大。
