Biophysics Laboratory, Department of Health and Exercise Science, University of Oklahoma, Norman, OK 73019, USA.
J Electromyogr Kinesiol. 2010 Feb;20(1):76-80. doi: 10.1016/j.jelekin.2008.09.009.
Avoiding the innervation zone (IZ) is important when collecting surface electromyographic data. The purposes of this study were threefold: (1) to examine the precision of two different techniques for expressing IZ location for the biceps brachii, (2) to compare these locations between men and women, and (3) to determine if IZ movement with changes in elbow joint angle is related to different anthropometric measures. Twenty-four subjects (mean+/-SD ages=21.8+/-3.5yr) performed isometric contractions of the right forearm flexors at each of three separate elbow joint angles (90 degrees, 120 degrees, and 150 degrees between the arm and forearm). During each contraction, the location of the IZ for the biceps brachii was visually identified using a linear electrode array. These IZ locations were expressed in both absolute (i.e. as a distance (mm) from the acromion process) and relative (i.e. as a percentage of humerus length) terms. The results suggested that the estimations of IZ location were more precise when expressed in relative versus absolute terms, and were generally different for men and women. The shift in IZ location with changes in elbow joint angle was not, however, related to height, weight, or humerus length.
在采集表面肌电图数据时，避免神经支配区（IZ）非常重要。本研究有三个目的：（1）检验两种不同方法表达肱二头肌 IZ 位置的精确性，（2）比较男性和女性之间的这些位置，（3）确定肘部关节角度变化时 IZ 的运动是否与不同的人体测量学指标有关。24 名受试者（平均年龄+/-标准差为 21.8+/-3.5 岁）在三个不同的肘部关节角度（手臂和前臂之间的 90 度、120 度和 150 度）下进行右侧前臂屈肌的等长收缩。在每次收缩过程中，使用线性电极阵列目视识别肱二头肌的 IZ 位置。这些 IZ 位置以绝对值（即距肩峰的距离（mm））和相对值（即肱骨长度的百分比）表示。结果表明，以相对值表示时，IZ 位置的估计更精确，且男性和女性之间通常存在差异。IZ 位置随肘部关节角度的变化而发生的变化与身高、体重或肱骨长度无关。
