Time series analysis of jaw muscle contraction and tissue deformation during mastication in miniature pigs
Time series analysis of jaw muscle contraction and tissue deformation during mastication in miniature pigs
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DOI：
10.1111/j.1365-2842.2004.01156.x
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发表时间：
2004-01-01
影响因子：
2.9
通讯作者：
Herring, SW
中科院分区：
文献类型：
--
作者：
Liu, ZJ;Green, JR;Herring, SW
咀嚼肌收缩会引起下颚运动和组织变形。采用时间序列分析方法对25头成年小型猪的自然咀嚼数据进行了研究。数据集包括同时记录双侧咬肌（MA）、颧下颌肌（ZM）和侧翼状肌的肌电图（EMG），左鳞骨（SQ）、髁突颈（CD）和下颌体（MD）的骨表面应变，以及使用微分可变磁阻传感器测量双侧颌骨关节囊的线性变形。两两比较通过计算相互关系函数进行检验。MA和ZM的下颌内收肌活动与CD和SQ应变呈高度交叉相关，与MD应变呈弱交叉相关。没有肌肉的活动与颌骨关节囊变形密切相关，也没有骨应变和囊变形紧密相关。同源肌对表现出最大的信号同步性，但信号本身的相关性不显著高于非同源肌对。这些结果表明骨应变和包膜变形是由不同的力学机制驱动的。肌肉收缩和随之而来的反作用力可能是造成骨应变的原因，而囊变形更可能是运动的产物。
Masticatory muscle contraction causes both jaw movement and tissue deformation during function. Natural chewing data from 25 adult miniature pigs were studied by means of time series analysis. The data set included simultaneous recordings of electromyography (EMG) from bilateral masseter (MA), zygomaticomandibularis (ZM) and lateral pterygoid muscles, bone surface strains from the left squamosal bone (SQ), condylar neck (CD) and mandibular corpus (MD), and linear deformation of the capsule of the jaw joint measured bilaterally using differential variable reluctance transducers. Pairwise comparisons were examined by calculating the cross-correlation functions. Jaw-adductor muscle activity of MA and ZM was found to be highly cross-correlated with CD and SQ strains and weakly with MD strain. No muscle's activity was strongly linked to capsular deformation of the jaw joint, nor were bone strains and capsular deformation tightly linked. Homologous muscle pairs showed the greatest synchronization of signals, but the signals themselves were not significantly more correlated than those of non-homologous muscle pairs. These results suggested that bone strains and capsular deformation are driven by different mechanical regimes. Muscle contraction and ensuing reaction forces are probably responsible for bone strains, whereas capsular deformation is more likely a product of movement.