Muramatsu T, Muraoka T, Takeshita D, Kawakami Y, Hirano Y, Fukunaga T
Institute of Physical Education, Keio University, Kohoku, Yokohama 223-8521, Japan.
J Appl Physiol (1985). 2001 May;90(5):1671-8. doi: 10.1152/jappl.2001.90.5.1671.
Load-strain characteristics of tendinous tissues (Achilles tendon and aponeurosis) were determined in vivo for human medial gastrocnemius (MG) muscle. Seven male subjects exerted isometric plantar flexion torque while the elongation of tendinous tissues of MG was determined from the tendinous movements by using ultrasonography. The maximal strain of the Achilles tendon and aponeurosis, estimated separately from the elongation data, was 5.1 +/- 1.1 and 5.9 +/- 1.6%, respectively. There was no significant difference in strain between the Achilles tendon and aponeurosis. In addition, no significant difference in strain was observed between the proximal and distal regions of the aponeurosis. The results indicate that tendinous tissues of the MG are homogeneously stretched along their lengths by muscle contraction, which has functional implications for the operation of the human MG muscle-tendon unit in vivo.
在人体内侧腓肠肌（MG）中，对腱组织（跟腱和腱膜）的负荷-应变特性进行了体内测定。七名男性受试者进行等长跖屈扭矩测试，同时通过超声检查从腱的运动中确定MG腱组织的伸长情况。根据伸长数据分别估算出的跟腱和腱膜的最大应变分别为5.1±1.1%和5.9±1.6%。跟腱和腱膜之间的应变无显著差异。此外，腱膜近端和远端区域之间的应变也未观察到显著差异。结果表明，MG的腱组织在肌肉收缩时沿其长度均匀拉伸，这对人体MG肌肉-腱单元在体内的运作具有功能意义。
