Klimstra Marc, Dowling Jim, Durkin Jennifer L, MacDonald Maureen
Rehabilitation Neuroscience Laboratory, University of Victoria, P.O. Box 3015, STN CSC, Victoria, British Columbia, Canada V8W 3P1.
J Electromyogr Kinesiol. 2007 Aug;17(4):504-14. doi: 10.1016/j.jelekin.2006.04.011. Epub 2006 Aug 21.
The purpose of this paper was to examine how muscle architecture parameter (MAP) measurements made using brightness-mode ultrasonography (BMU) differ based on probe orientation. The human tibialis anterior muscle was imaged from nine different probe orientations during concentric contractions at four joint angles to determine the effect of probe orientation on the measurement of muscle architecture parameters. Ankle dorsi-flexion torque, tibialis anterior electromyography (EMG), and measures of MAP including fascicle length (FL), pennation angle (PA) and muscle thickness (MT) were collected. Statistically significant differences were found between joint angles for measures of FL and PA and between probe orientations for measures of FL and MT. A comparison of actual MAP values to a geometric model used by researchers to determine an ideal probe orientation show that the actual values vary to a greater extent and do not follow the trend predicted by the model. The results suggest that ultrasound probe orientation affects measures of MAP but the effect either cannot be predicted from a geometric model and/or the error in the measurement technique does not allow a comparison.
本文的目的是研究使用亮度模式超声（BMU）测量的肌肉结构参数（MAP）如何因探头方向而异。在四个关节角度的同心收缩过程中，从九个不同的探头方向对人体胫骨前肌进行成像，以确定探头方向对肌肉结构参数测量的影响。收集了踝背屈扭矩、胫骨前肌肌电图（EMG）以及包括肌束长度（FL）、羽状角（PA）和肌肉厚度（MT）在内的MAP测量值。发现FL和PA测量值在关节角度之间以及FL和MT测量值在探头方向之间存在统计学上的显著差异。将实际MAP值与研究人员用于确定理想探头方向的几何模型进行比较，结果表明实际值变化幅度更大，且不遵循模型预测的趋势。结果表明，超声探头方向会影响MAP测量，但这种影响要么无法从几何模型中预测，和/或测量技术中的误差不允许进行比较。
