An isolated frog gastrocnemius tetanically stimulated performs a greater amount of positive work, during shortening at a given speed, if it has been stretched immediately before it was allowed to shorten. The increase of work performed is greater, the shorter the interval between stretching and shortening. A substantial amount of the work done on the contracted muscle during the stretching appears to be available during the shortening phase, as in elastic bodies.
(With the Technical Assistance of G. Orlando)
tension-length diagram of isolated contracted muscle; elasticity of contracted muscle; efficiency of muscular contraction
Submitted on May 4, 1964
- Copyright © 1965 the American Physiological Society