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Fuel use and metabolic response to endurance exercise: a wind tunnel study of a long-distance migrant shorebird

Jenni-Eiermann, Susanne; Jenni, Lukas; Kvist, Anders LU ; Lindström, Åke LU ; Piersma, Theunis and Visser, G Henk (2002) In Journal of Experimental Biology 205(16). p.2453-2460
Abstract
This study examines fuel use and metabolism in a group of long-distance migrating birds, red knots Calidris canutus (Scolopacidae), flying under controlled conditions in a wind tunnel for up to 10 h. Data are compared with values for resting birds fasting for the same time. Plasma levels of free fatty acids, glycerol and uric acid were elevated during flight, irrespective of flight duration (1-10h). Triglyceride levels, the estimated concentration of very-low-density lipoproteins (VLDLs) and beta-hydroxybutyrate levels were lower during flight, while glucose levels did not change. In flying birds, plasma levels of uric acid and lipid catabolites were positively correlated with the residual variation in body mass loss, and lipid catabolites... (More)
This study examines fuel use and metabolism in a group of long-distance migrating birds, red knots Calidris canutus (Scolopacidae), flying under controlled conditions in a wind tunnel for up to 10 h. Data are compared with values for resting birds fasting for the same time. Plasma levels of free fatty acids, glycerol and uric acid were elevated during flight, irrespective of flight duration (1-10h). Triglyceride levels, the estimated concentration of very-low-density lipoproteins (VLDLs) and beta-hydroxybutyrate levels were lower during flight, while glucose levels did not change. In flying birds, plasma levels of uric acid and lipid catabolites were positively correlated with the residual variation in body mass loss, and lipid catabolites with energy expenditure (as measured using the doubly labelled water method), after removing the effect of initial body mass. The plasma metabolite levels indicate: (i) that the rates of catabolism of lipids from adipose tissue and of protein are higher during flight; (H) that low ketone body concentrations probably facilitate fatty acid release from adipose tissue; (iii) that low triglyceride and VLDL levels do not indicate the use of an additional pathway of fatty acid delivery, as found in small birds; and (iv) that the relationships between energy expenditure, body mass loss and metabolic pattern suggest that a higher individual energy expenditure entails a higher rate of catabolism of both lipids and protein and not a shift in fuel substrate. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
lipid catabolism, expenditure, energy, plasma metabolite, Calidris canutus, red knot, bird, flight, protein catabolism, migration
in
Journal of Experimental Biology
volume
205
issue
16
pages
2453 - 2460
publisher
The Company of Biologists Ltd
external identifiers
  • pmid:12124368
  • wos:000177855700010
  • scopus:0036672049
ISSN
1477-9145
language
English
LU publication?
yes
id
e8fa53c3-1259-47fc-b6d9-757acf7e1671 (old id 329166)
date added to LUP
2007-10-24 14:45:49
date last changed
2017-08-06 03:52:06
@article{e8fa53c3-1259-47fc-b6d9-757acf7e1671,
  abstract     = {This study examines fuel use and metabolism in a group of long-distance migrating birds, red knots Calidris canutus (Scolopacidae), flying under controlled conditions in a wind tunnel for up to 10 h. Data are compared with values for resting birds fasting for the same time. Plasma levels of free fatty acids, glycerol and uric acid were elevated during flight, irrespective of flight duration (1-10h). Triglyceride levels, the estimated concentration of very-low-density lipoproteins (VLDLs) and beta-hydroxybutyrate levels were lower during flight, while glucose levels did not change. In flying birds, plasma levels of uric acid and lipid catabolites were positively correlated with the residual variation in body mass loss, and lipid catabolites with energy expenditure (as measured using the doubly labelled water method), after removing the effect of initial body mass. The plasma metabolite levels indicate: (i) that the rates of catabolism of lipids from adipose tissue and of protein are higher during flight; (H) that low ketone body concentrations probably facilitate fatty acid release from adipose tissue; (iii) that low triglyceride and VLDL levels do not indicate the use of an additional pathway of fatty acid delivery, as found in small birds; and (iv) that the relationships between energy expenditure, body mass loss and metabolic pattern suggest that a higher individual energy expenditure entails a higher rate of catabolism of both lipids and protein and not a shift in fuel substrate.},
  author       = {Jenni-Eiermann, Susanne and Jenni, Lukas and Kvist, Anders and Lindström, Åke and Piersma, Theunis and Visser, G Henk},
  issn         = {1477-9145},
  keyword      = {lipid catabolism,expenditure,energy,plasma metabolite,Calidris canutus,red knot,bird,flight,protein catabolism,migration},
  language     = {eng},
  number       = {16},
  pages        = {2453--2460},
  publisher    = {The Company of Biologists Ltd},
  series       = {Journal of Experimental Biology},
  title        = {Fuel use and metabolic response to endurance exercise: a wind tunnel study of a long-distance migrant shorebird},
  volume       = {205},
  year         = {2002},
}