Kellis Eleftherios
Laboratory of Neuromechanics, Department of Physical Education and Sport Sciences at Serres, Aristotle University of Thessaloniki, Greece.
J Electromyogr Kinesiol. 2016 Feb;26:111-9. doi: 10.1016/j.jelekin.2015.11.007. Epub 2015 Dec 10.
The purpose of this study was to quantify strain and elongation of the long head of the biceps femoris (BFlh) and the semitendinosus (ST) tendon/aponeurosis. Forty participants performed passive knee extension trials from 90° of knee flexion to full extension (0°) followed by ramp isometric contractions of the knee flexors at 0°, 45° and 90° of knee flexion. Two ultrasound probes were used to visualize the displacement of BFlh and ST tendon/aponeurosis. Three-way analysis of variance designs indicated that: (a) Tendon/aponeurosis (passive) elongation and strain were higher for the BFlh than the ST as the knee was passively extended (p<0.05), (b) contraction at each angular position was accompanied by a smaller BFlh tendon/aponeurosis (active) strain and elongation than the ST at higher levels of effort (p<0.05) and (c) combined (passive and active) strain was significantly higher for the BFlh than ST during ramp contraction at 0° but the opposite was observed for the 45° and 90° flexion angle tests (p<0.05). Passive elongation of tendon/aponeurosis has an important effect on the tendon/aponeurosis behavior of the hamstrings and may contribute to a different loading of muscle fibers and tendinous tissue between BFlh and ST.
本研究的目的是量化股二头肌长头（BFlh）和半腱肌（ST）肌腱/腱膜的应变和伸长情况。40名参与者进行了从膝关节屈曲90°至完全伸展（0°）的被动膝关节伸展试验，随后在膝关节屈曲0°、45°和90°时进行膝关节屈肌的斜坡等长收缩。使用两个超声探头来观察BFlh和ST肌腱/腱膜的位移。三因素方差分析结果表明：（a）随着膝关节被动伸展，BFlh的肌腱/腱膜（被动）伸长和应变高于ST（p<0.05）；（b）在较高用力水平下，每个角度位置的收缩伴随的BFlh肌腱/腱膜（主动）应变和伸长均小于ST（p<0.05）；（c）在0°斜坡收缩期间，BFlh的（被动和主动）组合应变显著高于ST，但在45°和90°屈曲角度测试中观察到相反结果（p<0.05）。肌腱/腱膜的被动伸长对腘绳肌腱/腱膜的行为有重要影响，可能导致BFlh和ST之间肌肉纤维和腱性组织的不同负荷。
