Head movement properties during voluntary rapid jaw movement in humans.
Head movement properties during voluntary rapid jaw movement in humans.
复制标题
人类自愿快速下巴运动期间的头部运动特性。
DOI：
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发表时间：
2001
影响因子：
2.9
通讯作者：
H. Fujii
中科院分区：
文献类型：
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作者：
T. Torisu;Y. Yamabe;N. Hashimoto;T. Yoshimatsu;H. Fujii
本研究的目的是确定下颌运动期间同步头部运动的开始是否是由下颌运动后的周围反射（即伸展或三叉颈反射）引起的，或者是由预编程的中枢命令启动的。使用固定在上门牙和下门牙上的加速度计以及颈部肌肉的肌电图（EMG）研究伴随着自愿快速张开下颌运动的头部运动。在所有试验中，89.2% 的上切牙头部加速度方向是在下颌张开运动开始时朝向头部伸展方向，与下颌加速度方向相反。头部加速度的发生比下颌加速度平均晚6.2~10.7 ms，胸锁乳突肌（SCM）肌电活动的发生早于头部加速度平均12.5~24.3 ms。这些发现表明，下颌运动期间的头部运动不是由外周反射启动的，而是由预先编程的中枢命令启动的。这可能与口颌疾病患者颈部和肩部区域的肌肉不适有关。
The purpose of this study was to determine whether the start of the synchronized head movement during mandibular movement is evoked by the peripheral reflexes following mandibular movement (i.e. stretch or trigemino-neck reflexes), or, alternatively, is started by pre-programmed central command. Head movement accompanying voluntary rapid jaw opening movement was studied using accelerometers fixed to the upper and lower incisors, as well as electromyographs (EMGs) of the neck muscles. The direction of head acceleration at the upper incisor was towards head extension at the beginning of jaw opening movement in 89.2% of all trials, opposite to the direction of lower jaw acceleration. The onset of head acceleration was later than that of the lower jaw acceleration by averages of 6.2-10.7 ms, and the onset of electromyographic activities of the sternocleidomastoid (SCM) muscle preceded that of head acceleration by an average of 12.5-24.3 ms. These findings suggest that head movement during mandibular movement is not started by peripheral reflexes but by pre-programmed central commands. This may be relevant to muscular discomfort in the neck and shoulder regions of patients with stomatognathic disorders.