van den Hooff H, Blangé T
Pflugers Arch. 1984 Oct;402(2):137-43. doi: 10.1007/BF00583325.
The transients of the tension and the angle of a first order diffraction line of isolated single intact muscle fibres of the M. lumbricalis IV of the foot resulting from rapid length changes have been measured. Furthermore simulations of the tension transients, taking the resonance frequency of the force transducer, the inertia of the fibre and the influence of the surrounding fluid into account, are presented. The tension transients could be simulated by a system of continuous elements with undamped elasticity - Young's modulus E1 = 1.8 X 10(8) N/m2 - in series with elasticity E2 = 5.4 X 10(7) N/m2 parallel to a damping element - coefficient of damping mu = 2,300 Ns/m2; yielding a relaxation time of 10 mus. The Young's modulus of the undamped series elasticity E1 implies that a sudden shortening of 2 nm per half sarcomere should reduce the active tension to zero. The results obtained from the diffraction pattern recording show that the displacement in the fibre is in accordance with the relative length change caused by the displacement generator. It is therefore believed that the tendon and tendon-muscle junction are sufficiently stiff to allow ascribing the above-mentioned elasticity and damping to the fibre itself.
已测量了足部第四蚓状肌孤立单根完整肌纤维的一阶衍射线的张力和角度因快速长度变化而产生的瞬态变化。此外，还给出了考虑力传感器共振频率、纤维惯性和周围流体影响的张力瞬态模拟。张力瞬态可用一个连续元件系统来模拟，该系统具有无阻尼弹性（杨氏模量E1 = 1.8×10⁸ N/m²），与弹性E2 = 5.4×10⁷ N/m² 串联，且与一个阻尼元件（阻尼系数μ = 2300 Ns/m²）并联，得到的弛豫时间为10微秒。无阻尼串联弹性E1的杨氏模量意味着每半个肌节突然缩短2纳米应会使主动张力降至零。从衍射图样记录获得的结果表明，纤维中的位移与位移发生器引起的相对长度变化一致。因此可以认为，肌腱和肌腱 - 肌肉连接处足够坚硬，从而可以将上述弹性和阻尼归因于纤维本身。
