[Comparison of force and shortening velocity in fast and slow rabbit muscle fibers at different temperatures].
The temperature dependence of force, maximal shortening velocity and power of maximally activated single permeabilized fibers from fast and slow muscles of the rabbit were recorded in a temperature range from 10 to 35 degrees C with 5 degrees C step. It was found that temperature dependence of force of both types of fibers is identical. Averaged maximal shortening velocity in the slow fibers, unlike the fast fibers, had no statistically significant temperature dependence that is not in agreement with the data obtained on intact rat muscle fibers and in an in vitro motility assay. However maximal shortening velocity in each individual slow fiber did depend on temperature. The temperature dependence of power of the slow fibers was lower than that of the fast ones. Because of large data scattering the average temperature dependence of power of the slow fibers was significantly lower than that in individual slow fibers.
P V
PV
Kochubeĭ
S Iu
SIu
Bershitskiĭ
D000818:Animals; D003080:Cold Temperature; D006358:Hot Temperature; D009119:Muscle Contraction; D018657:Muscle Fibers, Slow-Twitch; D053580:Muscle Strength; D011817:Rabbits; D051381:Rats