Effect of temperature and stimulus train duration on ...

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Title Effect of temperature and stimulus train duration on the departure from theoretical maximum work in fish muscle
Author(s) E. A. Luiker, E. D. Stevens
Journal Canadian Journal of Zoology / Revue Canadienne De Zoologie
Date 1994
Volume 72
Issue 6
Start page 965
End page 969
Abstract The goal of the present study was to compare the effect of temperature on contraction kinetic parameters of fish muscle with its effect on oscillatory work. In particular we studied the effect of stimulus train duration or duty cycle (the fraction of the imposed length change that the muscle was stimulated). We compared the actual work done by the muscle with a theoretical maximum work loop that would be achieved if it were fully and instantaneously relaxed at the onset of shortening and fully and instantaneously relaxed at the onset of lengthening. Temperature had a small effect on force but a marked effect on contraction and relaxation times. Thus, work was more temperature sensitive than force. The effect of temperature on work could not be predicted by its effect on any one contraction kinetic parameter. To achieve maximum work at lower temperatures, the duty cycle must be decreased because of the longer relaxation time.

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