Velocity of mammalian skeletal muscle contraction as a function of fiber type, activation, initial length and temperature.
Multiple stepwise regression analyses techniques were applied to develop modifications of the Hill force-velocity equation. Specifically, predictive models of the Hill a coefficient, the Hill b coefficient, and isometric strength P0 were developed for the following set of variables: the fraction of slow-twitch fibers (X), the recruitment magnitude (A), the initial muscle length (L), and the muscle temperature (T). Results indicate that the Hill a and Hill b coefficients and isometric strength P0 can be predicted with a high degree of accuracy. The utility of the equation is that it would allow development of a computer program to control the velocity of contraction of muscles with differing fiber compositions and lengths such as are found in the leg.
Phillips
C A
CA
Department of Biomedical and Human Factors Engineering, Wright State University, Dayton, OH 45435.
Koubek
R J
RJ
Crouch
E
E
D000818:Animals; D002415:Cats; D066298:In Vitro Techniques; D007537:Isometric Contraction / Q000502:physiology*; D008322:Mammals / Q000502:physiology*; D008954:Models, Biological; D012016:Reference Values; D012044:Regression Analysis; D012985:Software Design; D013696:Temperature