Architectural and functional features of human triceps surae muscles during contraction
Architectural and functional features of human triceps surae muscles during contraction
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DOI：
10.1152/jappl.1998.85.2.398
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发表时间：
1998-08-01
影响因子：
3.3
通讯作者：
Fukunaga, T
中科院分区：
文献类型：
--
作者：
Kawakami, Y;Ichinose, Y;Fukunaga, T
小腿三头肌肌肉的结构特性，在体内测定六名男子。将脚踝定位在背屈15度（-15度）和跖屈0度、15度和30度，将膝盖设置为0度、45度和90度。在每个位置，纵向超声图像的内侧（MG）和外侧（LG）腓肠肌和比目鱼肌（溶胶）肌肉，而受试者放松（被动），并进行最大等长跖屈（主动），从其中确定的筋膜长度和角度。在被动条件下，MG、LG和Sol的肌束长度分别从59、65和43 mm（膝关节，0度;踝关节，-15度）变为32、41和30 mm（膝关节，90度踝关节，30度）。收缩引起的肌束缩短在肌束长度较长时更为明显。MG有最大的肌束角，范围从22至67度，并在一个非常不利的条件下，膝关节屈曲90度时，无论踝关节的位置。不同的长度和角度的束，以及它们的变化收缩，可能与不同的肌肉和肌腱和腱膜的弹性特性的生产能力。
Architectural properties of the triceps surae muscles were determined in vivo for six men. The ankle was positioned at 15 degrees dorsiflexion (-15 degrees) and 0, 15, and 30 degrees plantar flexion, with the knee set at 0, 45, and 90 degrees. At each position, longitudinal ultrasonic images of the medial (MG) and lateral (LG) gastrocnemius and soleus (Sol) muscles were obtained while the subject was relaxed (passive) and performed maximal isometric plantar flexion (active), from which fascicle lengths and angles with respect to the aponeuroses were determined. In the passive condition, fascicle lengths changed from 59, 65, and 43 mm (knee, 0 degrees; ankle, -15 degrees) to 32, 41, and 30 mm (knee, 90 degrees ankle, 30 degrees) for MG, LG, and Sol, respectively. Fascicle shortening by contraction was more pronounced at longer fascicle lengths. MG had greatest fascicle angles, ranging from 22 to 67 degrees, and was in a very disadvantageous condition when the knee was flexed at 90 degrees, irrespective of ankle positions. Different lengths and angles of fascicles, and their changes by contraction, might be related to differences in force-producing capabilities of the muscles and elastic characteristics of tendons and aponeuroses.