Legerlotz Kirsten, Smith Heather K, Hing Wayne A
Department of Sport and Exercise Science, University of Auckland, Auckland, New Zealand.
Clin Physiol Funct Imaging. 2010 May;30(3):198-205. doi: 10.1111/j.1475-097X.2010.00925.x. Epub 2010 Feb 23.
The aim of this study was to evaluate the suitability of ultrasonography for the quantification of gastrocnemius muscle architecture in healthy young children. The variation and reliability of measurement of muscle thickness, pennation angle and fibre length of the medial gastrocnemius were determined, using stationary and portable ultrasound machines, in 13 boys and eight girls aged 4-10. Ultrasound images were obtained from each leg, in duplicate, with the ankle at 90 degrees , then at maximal plantar flexion, with the two machines within the same session. The same set of 16 scans was repeated in four children 4-6 weeks later. The mean muscle thickness, pennation angle and fibre length differed between ankle positions and between legs. Measurements obtained using the two machines established similar values with no significant differences in absolute values and coefficients of variation (CV). For duplicate images taken during the same session for the same leg, ankle position and machine, the CV and intraclass correlation coefficients (ICC) ranged, respectively, from 2.1% to 3.1% and 0.94-0.98 for muscle thickness, from 4.1% to 6.0% and 0.85-0.96 for pennation angle and from 4.5% to 6.3% and 0.87-0.96 for fibre length. Corresponding values for variables for the same child measured on two separate occasions were within the same ranges, all being similar to reliability data reported previously for adult muscle. Muscle thickness, pennation angle and fibre length of the medial gastrocnemius can therefore be quantified reliably, using either a stationary or portable ultrasound machine, in healthy young children.
本研究的目的是评估超声检查对健康幼儿腓肠肌肌肉结构定量分析的适用性。使用固定式和便携式超声仪，对13名4至10岁男孩和8名女孩的腓肠肌内侧肌肉厚度、羽状角和纤维长度测量的变异性及可靠性进行了测定。在踝关节呈90度以及最大跖屈时，从每条腿获取超声图像，一式两份，两台仪器在同一次检查中使用。4至6周后，对4名儿童重复进行相同的16次扫描。踝关节位置和双腿之间的平均肌肉厚度、羽状角和纤维长度存在差异。使用两台仪器获得的测量值相近，绝对值和变异系数（CV）无显著差异。对于同一条腿、踝关节位置和仪器在同一次检查中拍摄的重复图像，肌肉厚度的CV和组内相关系数（ICC）分别为2.1%至3.1%和0.94 - 0.98，羽状角为4.1%至6.0%和0.85 - 0.96，纤维长度为4.5%至6.3%和0.87 - 0.96。在两个不同时间对同一儿童测量的变量对应值在相同范围内，均与先前报道的成人肌肉可靠性数据相似。因此，使用固定式或便携式超声仪均可在健康幼儿中可靠地定量腓肠肌内侧的肌肉厚度、羽状角和纤维长度。
