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First published online January 17, 2007
Journal of Experimental Biology 210, 413-420 (2007)
Published by The Company of Biologists 2007
doi: 10.1242/jeb.02660

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Relationship between n-3 PUFA content and energy metabolism in the flight muscles of a migrating shorebird: evidence for natural doping

Dominique Maillet and Jean-Michel Weber^*

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

View larger version (15K): [in this window] [in a new window]   Fig. 1. Pectoral muscle enzyme activities (µmol min–1 g–1 lean muscle mass) versus percent body fat in semipalmated sandpipers refueling in the Bay of Fundy. CS, citrate synthase (N=38 animals); CPT, carnitine palmitoyl transferase (N=39); HOAD, 3-hydroxyacyl dehydrogenase (N=37); LDH, lactate dehydrogenase (N=39). Lines were fitted by linear regression (CS: y=455.93+3.56x; HOAD: y=72.29+0.79x). *P<0.05; NS, not significant.

View larger version (17K): [in this window] [in a new window]   Fig. 2. Citrate synthase (CS) activity (µmol min–1 g–1 lean muscle mass) in pectoral muscle of refueling semipalmated sandpipers vs %20:5 (A,C) and %22:6 (B,D) in fuel reserves (total body neutral lipids, NL; A,B) and muscle phospholipids (PL; C,D). 20:5 is eicosapentaenoic acid and 22:6 is docosahexaenoic acid. Lines were fitted by linear regression (%20:5 NL: y=435.32+12.42x; %22:6 PL: y=455.30+8.90x). N=38. *P<0.05; **P<0.01; NS, not significant.

View larger version (24K): [in this window] [in a new window]   Fig. 3. 3-hydroxyacyl dehydrogenase (HOAD) activity (µmol min–1 g–1 lean muscle mass) in pectoral muscle of refueling semipalmated sandpipers vs %20:5 (A,D), %22:6 (B,E) and %18:1 (C,F) in fuel reserves (total body neutral lipids, NL; A–C) and muscle phospholipids (PL; D–F). 20:5 is eicosapentaenoic acid, 22:6 is docosahexaenoic acid, and 18:1 is oleic acid. Lines were fitted by linear regression (%20:5 PL: y=53.02+2.80x; %18:1 PL: y=161.90–4.94x). N=37. *P<0.05; **P<0.01; ***P<0.005; NS, not significant.

View larger version (17K): [in this window] [in a new window]   Fig. 4. Lactate dehydrogenase (LDH) activity (µmol min–1 g–1 lean muscle mass) in pectoral muscle of refueling semipalmated sandpipers vs %20:5 (A,C) and %22:6 (B,D) in fuel reserves (total body neutral lipids, NL; A,B) and muscle phospholipids (PL; C,D). 20:5 is eicosapentaenoic acid and 22:6 is docosahexaenoic acid. Lines were fitted by linear regression (%20:5 NL: y=409.86+23.54x; %22:6 NL: y=460.62+47.41x). N=39. ***P<0.005; NS, not significant.