Hodges P W
Prince of Wales Medical Research Institute, Barker Street Randwick, Sydney, NSW 2031, Australia.
Exp Brain Res. 2001 Nov;141(2):261-6. doi: 10.1007/s002210100873.
Changes in trunk muscle recruitment have been identified in people with low-back pain (LBP). These differences may be due to changes in the planning of the motor response or due to delayed transmission of the descending motor command in the nervous system. These two possibilities were investigated by comparison of the effect of task complexity on the feedforward postural response of the trunk muscles associated with rapid arm movement in people with and without LBP. Task complexity was increased by variation of the expectation for a command to either abduct or flex the upper limb. The onsets of electromyographic activity (EMG) of the abdominal and deltoid muscles were measured. In control subjects, while the reaction time of deltoid and the superficial abdominal muscles increased with task complexity, the reaction time of transversus abdominis (TrA) was constant. However, in subjects with LBP, the reaction time of TrA increased along with the other muscles as task complexity was increased. While inhibition of the descending motor command cannot be excluded, it is more likely that the change in recruitment of TrA represents a more complex change in organisation of the postural response.
下背痛（LBP）患者已被发现存在躯干肌肉募集的变化。这些差异可能是由于运动反应计划的改变，或者是由于神经系统中下行运动指令的传递延迟。通过比较任务复杂性对有和没有下背痛的人在快速手臂运动时与躯干肌肉前馈姿势反应的影响，对这两种可能性进行了研究。通过改变对上肢外展或屈曲指令的预期来增加任务复杂性。测量了腹部和三角肌的肌电图活动（EMG）起始时间。在对照组中，虽然三角肌和腹浅肌的反应时间随着任务复杂性的增加而增加，但腹横肌（TrA）的反应时间是恒定的。然而，在下背痛患者中，随着任务复杂性的增加，腹横肌的反应时间与其他肌肉一样增加。虽然不能排除下行运动指令的抑制，但腹横肌募集的变化更可能代表姿势反应组织中更复杂的变化。
