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First published online November 2, 2007
Journal of Experimental Biology 210, 4016-4023 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.007708
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Endurance swimming activates trout lipoprotein lipase: plasma lipids as a fuel for muscle

Leonardo Magnoni and Jean-Michel Weber*

Biology Department, University of Ottawa, 30 Marie Curie, Ottawa, Ontario, K1N 6N5, Canada


Figure 1
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  		Fig. 1. Effect of endurance swimming (4 days at 1.5 BL s–1) on lipoprotein lipase activity (LPL) in red muscle of rainbow trout. Values are mean ± s.e.m. (N=8). Letter a denotes a significant difference from the resting control (P<0.01).

 

Figure 2
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  		Fig. 2. Concentrations of fatty acids (FA) (A), proteins (B) and FA to protein ratio (C) in the plasma lipoproteins of rainbow trout after 4 days of resting or 4 days of sustained swimming at 1.5 BL s–1. Values are mean ± s.e.m. (N=7). HDL, high density, LDL, low density and VLDL, very low density lipoproteins.

 

Figure 3
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  		Fig. 3. Concentrations of phospholipids (PL) (A), triacylglycerol (TAG) (B), and non-esterified fatty acids (NEFA) (C) in the plasma lipoproteins of rainbow trout after 4 days of rest or swimming at 1.5 BL s–1. To allow comparisons between lipid classes, all concentrations are given in µmol fatty acids ml–1 plasma. Absolute PL and TAG concentrations can be obtained by dividing the values presented in A by 2 (2 fatty acids per PL) and in B by 3 (3 fatty acids per TAG). Values are mean ± s.e.m. (N=7). HDL, high density, LDL, low density and VLDL, very low density lipoproteins.

 

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  		Fig. 4. Time course of changes in lipoprotein lipase activity of rainbow trout plasma after injection of 200 or 600 U heparin kg–1 body mass. Values are mean ± s.e.m. (N=8). Letters show significant differences from control values at time 0 (before heparin administration).

 

Figure 5
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  		Fig. 5. Concentrations of triacylglycerol (TAG) (A) and glycerol (B) in rainbow trout plasma after injection of 200 or 600 U heparin kg–1 body mass. Values are means ± s.e.m. (N=8).

 

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  		Fig. 6. Plasma lipoprotein lipase activity before and 1 h after administration of 600 U heparin kg–1 body mass in resting (control) and swimming rainbow trout (4 days at 1.5 BL s–1). Heparin increased LPL activity in both groups (P<0.001), but this effect was not different between resting and swimming fish (P>0.05). Values are means ± s.e.m. (N=9).

 

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© The Company of Biologists Ltd 2007