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The Journal of Experimental Biology 205, 1585-1595 (2002)
© 2002 The Company of Biologists Limited

Isometric and isovelocity contractile performance of red musle fibres from the dogfish Scyliorhinus canicula

F. Lou1,*, N. A. Curtin1,{dagger} and R. C. Woledge2

1 Biological Structure and Function, Division of Biomedical Sciences, Faculty of Medicine, Sir Alexander Fleming Building, Imperial College of Science, Technology and Medicine, London SW7 2AZ
2 UCL Institute of Human Performance, Royal National Orthopaedic Hospital Trust, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK
* Present address: Department of Biosciences, Faculty of Natural Sciences, University of Hertfordshire, College Lane, Hatfield, Hertfordshire AL10 9AB, UK

{dagger} Author for correspondence (e-mail: n.curtin{at}ic.ac.uk )

Accepted 19 March 2002

Maximum isometric tetanic force produced by bundles of red muscle fibres from dogfish, Scyliorhinus canicula (L.), was 142.4±10.3 kN m-2 (N=35 fibre bundles); this was significantly less than that produced by white fibres 289.2±8.4 kN m-2 (N=25 fibre bundles) (means ± S.E.M.). Part, but not all, of the difference is due to mitochondrial content. The maximum unloaded shortening velocity, 1.693±0.108 L0 s-1 (N=6 fibre bundles), was measured by the slack-test method. L0 is the length giving maximum isometric force. The force/velocity relationship was investigated using a step-and-ramp protocol in seven red fibre bundles. The following equation was fitted to the data: [(P/P0)+(a/P0)](V+b)=[(P0*/P0)+(a/P0)]b, where P is force during shortening at velocity V, P0 is the isometric force before shortening, and a, b and P0* are fitted constants. The fitted values were P0*/P0=1.228±0.053, Vmax=1.814±0.071 L0 s-1, a/P0=0.269±0.024 and b=0.404±0.041 L0 s-1 (N=7 for all values). The maximum power was 0.107±0.005P0Vmax and was produced during shortening at 0.297±0.012Vmax. Compared with white fibres from dogfish, the red fibres have a lower P0 (49%) and Vmax (48%), but the shapes of the force/velocity curves are similar. Thus, the white and red fibres have equal capacities to produce power within the limits set by the isometric force and maximum velocity of shortening of each fibre type. A step shortening of 0.050±0.003L0 (N=7) reduced the maximum isometric force in the red fibres' series elasticity to zero. The series elasticity includes all elastic structures acting in series with the attached cross-bridges. Three red fibre bundles were stretched at a constant velocity, and force (measured when length reached L0) was 1.519±0.032P0. In the range of velocities used here, -0.28 to -0.63Vmax, force varied little with the velocity.

Key words: red muscle, fish, muscle, contraction, power, isometric force, P0, force/velocity, force, series elasticity, V0, Vmax, Scyliorhinus canicula, dogfish


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