Lieber R L, Leonard M E, Brown C G, Trestik C L
Division of Orthopedics and Rehabilitation, Veterans Administration Medical Center, San Diego, California.
Am J Physiol. 1991 Jul;261(1 Pt 1):C86-92. doi: 10.1152/ajpcell.1991.261.1.C86.
The mechanical properties of the frog semitendinosis (ST) tendon, bone-tendon junction, and aponeurosis were measured during passive loading to a tension equal to maximum isometric tension (Po). Stiffness and strain in these regions continuously increased as load increased. Tendon stiffness was approximately four times the aponeurosis stiffness. Tendon Young's modulus at Po was only 188 MPa, which is approximately 10 times less than the modulus reported for most mammalian tendons. Similarly, tendon stress at Po was only approximately 3 MPa, which is also less than that predicted for many tendons. Tendon strain at Po was approximately 2% after passive loading. We conclude that different regions of the frog ST tendon have different mechanical properties and that the frog ST tendon operates physiologically in the "toe" region of the stress-strain curve with a variable stiffness that increases with load. Taken together, these results have significant implications in understanding muscle-tendon design and neuromotor control strategies.
在被动加载至等于最大等长张力（Po）的张力过程中，测量了青蛙半腱肌（ST）肌腱、骨 - 肌腱连接处和腱膜的力学性能。随着负荷增加，这些区域的刚度和应变持续增加。肌腱刚度约为腱膜刚度的四倍。Po 时肌腱的杨氏模量仅为 188 MPa，约为大多数哺乳动物肌腱报道模量的十分之一。同样，Po 时肌腱应力仅约为 3 MPa，也低于许多肌腱的预测值。被动加载后，Po 时肌腱应变约为 2%。我们得出结论，青蛙 ST 肌腱的不同区域具有不同的力学性能，并且青蛙 ST 肌腱在应力 - 应变曲线的“趾”区生理运行，其刚度随负荷增加而变化。综上所述，这些结果对理解肌肉 - 肌腱设计和神经运动控制策略具有重要意义。
