LATERAL PREFERENCE IN MASTICATION - RELATION TO PAIN
LATERAL PREFERENCE IN MASTICATION - RELATION TO PAIN
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DOI：
10.1111/j.1365-2842.1985.tb01292.x
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发表时间：
1985-01-01
影响因子：
2.9
通讯作者：
RADUE, JT
中科院分区：
文献类型：
--
作者：
CHRISTENSEN, LV;RADUE, JT
10名受试者进行故意的右侧和左侧咀嚼口香糖，每次运动持续60 s，然后进行最大自主咬牙（MVC），直到咬肌疼痛（疼痛阈值）发作。用积分和累积表面肌电图（EMG）评估左右咬肌的收缩活动。当右和左肌肉仅作为咀嚼侧肌肉时，它们产生几乎相同水平的咀嚼力;当它们仅作为非咀嚼侧肌肉时也是如此。在相同的功能期间，EMG表明两对肌肉中相同的运动单位募集和放电模式;即，为咀嚼侧活动产生相对高张力的单元，以及为非咀嚼侧活动产生相对低张力的其它单元。在等长MVC活动期间，直到疼痛发作，左右肌肉产生几乎相同水平的咬合力，但左右运动单元活动模式似乎不同。左、右运动单位可能以不同的速率放电，或者在不同的时间开始放电。在后一种情况下，快速之前缓慢疲劳的单位。有一个趋势，低痛阈高咀嚼侧活动在两个咬肌。运动单位产生高度紧张，但容易疲劳，可能会导致肌肉疼痛的早期发作。首选咀嚼侧和初始肌肉疼痛侧之间没有关系，MVC活动与疼痛发作侧和首选咀嚼侧之间也没有关系。
Ten subjects performed deliberate right and left-sided chewing of gum, each exercise with a duration of 60 s, followed by maximum voluntary teeth clenching (MVC) until onset of pains in the masseter muscles (pain threshold). Contractile activities of the right and left masseter muscles were assessed by integrated and cumulative surface electromyography (EMG). When the right and left muscles functioned as chewing side muscles only, they generated practically identical levels of chewing force; the same applied when they functioned as non-chewing side muscles only. During identical functions, EMGs suggested identical motor unit recruitment and firing patterns in the two paired muscles; i.e., units producing relatively high tensions for chewing side activity, and other units producing relatively low tensions for non-chewing side activity. During isometric MVC activity, until onset of pains, the right and left muscles generated practically identical levels of bite force, but right and left motor unit activity patterns seemed to differ. Right and left motor units might have fired at different rates or begun to drop out at different times. In the latter case, rapidly before slowly fatigued units. There was a tendency for a low pain threshold with high chewing side activity in both masseter muscles. Motor units producing high levels of tension, but easily fatigued, might have caused early onset of muscle pains. No relationships could be established between preferred chewing side and side of initial muscle pains, nor between MVC activity and side of pain onset and preferred chewing side.