|
| |
|
|
|
|
||||
| Home Help Feedback Subscriptions Archive Search Table of Contents | ||||
Journal of Experimental Biology, Vol 183, Issue 1 137-147, Copyright © 1993 by Company of Biologists
JOURNAL ARTICLES |
N. A. Curtin and R. C. Woledge
Net work output and heat production of white myotomal muscle fibres from the dogfish were measured during complete cycles of sinusoidal movement at 12°C. The peak-to-peak movement was about 9 % of the muscle fibre length; three stimuli at 32 ms intervals were given in each mechanical cycle. The frequency of movement and the timing of the stimulation were varied for each preparation to find the optimal conditions for power output and those optimal for efficiency (the ratio of net work output to total energy output as heat+work). To achieve either maximum power or maximum efficiency, the tetanus must start while the muscle fibres are being stretched, before the beginning of the shortening part of the mechanical cycle. The highest power output, averaged over one cycle, was 0.23+/-0.014 W g-1 dry mass (+/-s.e.m., N=9, 46.9+/-2.8 mW g-1 wet mass) and was produced during movement at 3.5 Hz. The highest efficiency, 0.41+/-0.02 (+/-s.e.m., N=13), occurred during movements at 2.0-2.5 Hz. This value is higher than the efficiency previously measured during isovelocity shortening of these fibres. The implications of the high efficiency for crossbridge models of muscle contraction are discussed.
This article has been cited by other articles:
|
|
 |
|
  M. Trinh and D. A. Syme Effects of stretch on work and efficiency of frog (Rana pipiens) muscle J. Exp. Biol., August 15, 2007; 210(16): 2843 - 2850. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. M. Donley, R. E. Shadwick, C. A. Sepulveda, and D. A. Syme Thermal dependence of contractile properties of the aerobic locomotor muscle in the leopard shark and shortfin mako shark J. Exp. Biol., April 1, 2007; 210(7): 1194 - 1203. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 T. G West, M. A Ferenczi, R. C Woledge, and N. A Curtin Influence of ionic strength on the time course of force development and phosphate release by dogfish muscle fibres J. Physiol., September 15, 2005; 567(3): 989 - 1000. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Y. Yaniv, R. Sivan, and A. Landesberg Analysis of hystereses in force length and force calcium relations Am J Physiol Heart Circ Physiol, January 1, 2005; 288(1): H389 - H399. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 Swimming speed estimation of extinct marine reptiles: energetic approach revisited Paleobiology, June 1, 2002; 28(2): 251 - 262.
|
|
|
|
|
|
F. Lou, N. A. Curtin, and R. C. Woledge Isometric and isovelocity contractile performance of red musle fibres from the dogfish Scyliorhinus canicula J. Exp. Biol., June 1, 2002; 205(11): 1585 - 1595. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
C. L. Harwood, I. S. Young, and J. D. Altringham How the efficiency of rainbow trout (Oncorhynchus mykiss) ventricular muscle changes with cycle frequency J. Exp. Biol., March 1, 2002; 205(5): 697 - 706. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
L. J. Mellors and C. J. Barclay The energetics of rat papillary muscles undergoing realistic strain patterns J. Exp. Biol., January 11, 2001; 204(21): 3765 - 3777. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. D'Aout, N. A. Curtin, T. L. Williams, and P. Aerts Mechanical properties of red and white swimming muscles as a function of the position along the body of the eel Anguilla anguilla J. Exp. Biol., January 7, 2001; 204(13): 2221 - 2230. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
J. Baxi, C. J. Barclay, and C. L. Gibbs Energetics of rat papillary muscle during contractions with sinusoidal length changes Am J Physiol Heart Circ Physiol, May 1, 2000; 278(5): H1545 - H1554. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
K. Gustafson, G. Egrie, and S. Reichenbach Relative metabolic utilization of in situ rabbit soleus muscle: thermistor-based measurements and model J. Exp. Biol., January 12, 2000; 203(23): 3667 - 3674. [Abstract] [PDF]
|
|
