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First published online July 20, 2006
Journal of Experimental Biology 209, 2971-2978 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02341

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Effects of different training protocols on Ca²⁺ handling and oxidative capacity in skeletal muscle of Atlantic salmon (Salmo salar L.)

Katja Anttila, Satu Mänttäri^* and Matti Järvilehto

Department of Biology, University of Oulu, PO Box 3000, FIN-90014, Oulu, Finland

View larger version (17K): [in a new window]   Fig. 1. The alteration of the staining intensities of dihydropyridine (DHP; A,B) and ryanodine (Ry; C) receptors in white (A) and red (B,C) muscle sections of salmon. Sections were incubated in 20 nmol l-1 high affinity (-)-enantiomer of dihydropyridine labelled with orange fluorophore and in 0.5 µmol l-1 high affinity (-)-enantiomer of ryanodine labelled with green fluorophore. Exercise protocol: three different swimming velocities, 1, 1.5 and 2 BL s-1, and three different training periods, 2, 4 and 6 weeks. Difference between control and trained group significant at *P<0.05, P<0.01 or P<0.001. CL, control level.

View larger version (26K): [in a new window]   Fig. 2. (A) The change in the optical density unit (oDu) values of dihydropyridine receptor (DHPR) measured from white muscle homogenates analysed by western blotting. (B) The change in the optical density unit values of ryanodine receptor (RyR) from white muscle homogenates of salmon. (C) Membranes containing electrophoretically separated DHPR and RyR from white muscle of control and trained salmon. Exercise protocol: three different swimming velocities, 1 (low), 1.5 (intermediate) and 2 BL s-1 (high) and three different training durations, 2, 4 and 6 weeks. Difference between control (ctrl) and trained group significant at *P<0.05, P<0.01 or P<0.001. CL, control level.

View larger version (17K): [in a new window]   Fig. 3. The alteration of staining intensities of succinate dehydrogenase (SDH; A,B) and phosphorylase (C,D) in red (B,D) and white (A,C) muscles of salmon measured from muscle sections obtained from fish exercised with different training protocols. Exercise protocol: three different swimming velocities, 1, 1.5 and 2 BL s-1, and three different training durations, 2, 4 and 6 weeks. Difference between control and trained group significant at *P<0.05, P<0.01 or P<0.001. CL, control level.

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