70, No. 3, September 1993. Printed in U.S.A.. Mechanical Properties of Cat Soleus Muscle Elicited by Sequential. Ramp Stretches: Implications for trol of Muscle.
JOURNALOF NEUROPHYSIOLOGY Vol. 70, No. 3, September 1993. Printed
in U.S.A.
Mechanical Properties of Cat Soleus Muscle Elicited by Sequential Ramp Stretches: Implications for trol of Muscle DAVID C. LIN AND W. ZEV RYMER Departments of Biomedical Engineering, Physiology, and Physical Medicine and Rehabilitation, University Medical School; and The Veterans Administration Lakeside, Chicago, Illinois 60611 SUMMARY
AND
CONCLUSIONS
I. Force changes in areflexive cat soleus muscle in decerebrate cats were recorded in response to two sequential constant velocity (ramp) stretches, separated by a variable time interval during which the length was held constant. Initial (i.e., prestretch) background force was generated by activating the crossed-extension reflex, and stretch reflexes were eliminated by section of ipsilateral dorsal roots. 2. For the initial 400-900 pm of the first stretch, the muscle exhibited high stiffness, classically termed “short-range stiffness.” This high stiffness region was followed by an abrupt reduction in stiffness, called muscle “yield,” after which force remained at a relatively constant level, achieving a plateau in force. This plateau force level depended largely on stretch velocity, but this dependence was much less than proportional to the increase in stretch velocity, in that a IO-fold increase in velocity produced
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In frog muscle fibres, tetanically stimulated at a sarcomere length of about. 2 fim, stretched at a velocity of 1 length s"1 and released against a force equal.
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