Herzog W, Read L J, Ter Keurs H E
Faculty of Physical Education, Biomechanics, The University of Calgary, Calgary, Alberta, Canada.
Clin Biomech (Bristol). 1991 Nov;6(4):230-8. doi: 10.1016/0268-0033(91)90051-Q.
The purpose of this study was to determine force-length relations of intact human gastrocnemius muscles experimentally. Changes in maximal active isometric forces of the gastrocnemius muscle were calculated from resultant ankle joint moments of carefully executed maximal effort contractions at systematically changing knee and ankle joint configurations. Changes in muscle lengths were obtained using second-order polynomial regression equations that relate the length of the gastrocnemius muscle-tendon unit to knee and ankle joint angles. From these changes in muscle lengths, changes in muscle fibre lengths were estimated based on assumptions about fibre structure and series elastic properties. The results indicate that intact human gastrocnemius muscles operate on the ascending limb of the force-length relation, and that passive forces are minimal within a normal range of ankle and knee joint configurations.
本研究的目的是通过实验确定完整人体腓肠肌的力-长度关系。在系统改变膝关节和踝关节构型的情况下，通过精心执行的最大努力收缩所产生的踝关节合力矩来计算腓肠肌最大主动等长力的变化。肌肉长度的变化通过二阶多项式回归方程获得，该方程将腓肠肌肌腱单元的长度与膝关节和踝关节角度相关联。根据关于纤维结构和串联弹性特性的假设，从这些肌肉长度变化中估算出肌纤维长度的变化。结果表明，完整人体腓肠肌在力-长度关系的上升支上起作用，并且在踝关节和膝关节构型的正常范围内，被动力最小。
