Summation of Motor Unit Force in Passive and Active Muscle

Nonlinear summation of force has been observed between motor units. The complex structure of muscle suggests many reasons why this could happen. When large portions of the muscle are active, however, the nonlinearities are small, and generally explained by stretch of the common elasticity. This suggests that the type of nonlinearity observed between motor units may not be physiologically significant.

[1]  P. Huijing.  Muscular Force Transmission Necessitates a Multilevel Integrative Approach to the Analysis of Function of Skeletal Muscle , 2003, Exercise and sport sciences reviews.

[2]  U. Proske,et al.  Summation of tension in motor units of the soleus muscle of the cat , 1990, Neuroscience Letters.

[3]  M. Binder,et al.  Summation of motor unit tensions in the tibialis posterior muscle of the cat under isometric and nonisometric conditions. , 1991, Journal of neurophysiology.

[4]  D. Troiani,et al.  Nonlinear tension summation of different combinations of motor units in the anesthetized cat peroneus longus muscle. , 1999, Journal of neurophysiology.

[5]  U Proske,et al.  Stiffness of cat soleus muscle and tendon during activation of part of muscle. , 1984, Journal of neurophysiology.

[6]  G. Loeb,et al.  Neuromuscular organization of feline anterior sartorius: II. Intramuscular length changes and complex length‐tension relationships during stimulation of individual nerve branches , 1992, Journal of morphology.

[7]  Manuel Hulliger,et al.  Summation of forces from multiple motor units in the cat soleus muscle. , 2003, Journal of neurophysiology.

[8]  T. Sandercock,et al.  Nonlinear summation of force in cat soleus muscle results primarily from stretch of the common-elastic elements. , 2000, Journal of applied physiology.

[9]  T. Sandercock.  Nonlinear summation of force in cat tibialis anterior: a muscle with intrafascicularly terminating fibers. , 2003, Journal of applied physiology.

[10]  P. Matthews,et al.  An investigation into the possible existence of polyneuronal innervation of individual skeletal muscle fibres in certain hind‐limb muscles of the cat , 1960, The Journal of physiology.

[11]  P. Rack,et al.  The effects of length and stimulus rate on tension in the isometric cat soleus muscle , 1969, The Journal of physiology.

[12]  H. Clamann,et al.  Nonlinear force addition of newly recruited motor units in the cat hindlimb , 1988, Muscle & nerve.