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Cardiac performance in relation to oxygen supply varies in dietary lipid composition in sturgeon

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Cardiac performance in relation to oxygen supply varies in dietary lipid composition in sturgeon

Auteurs : C. Agnisola [Italie, Royaume-Uni] ; D. J. Mckenzie ; E. W. Taylor ; C. L. Bolis ; B. Tota

Source :

American journal of physiology. Regulatory, integrative and comparative physiology [ 0363-6119 ] ; 1996.

RBID : Pascal:96-0452815

Descripteurs français

Pascal (Inist)
- Hypoxie, Régime alimentaire, Lipide, Acide gras polyinsaturé, Coeur, Rythme cardiaque, α-Tocophérol, Pisces, Acipenser naccarii.

English descriptors

KwdEn :
- Diet, Heart, Heart rate, Hypoxia, Lipids, Pisces, Polyunsaturated fatty acid, α-Tocopherol.

Abstract

Agnisola, C., D. J. McKenzie, E. W. Taylor, C. L. Bolis, and B. Tota. Cardiac performance in relation to oxygen supply varies with dietary lipid composition in sturgeon. Am. J. Physiol. 271 (Regulatory Integrative Comp. Physiol. 40): R417-R425, 1996.-Dietary polyunsaturated fatty acids (PUFA) of the n-3 series that have beneficial effects on mammalian heart function are typically found at high levels in fish tissues. The effects of dietary fatty acid composition on cardiac function were investigated in the sturgeon. When compared with sturgeon maintained for 1 yr on a diet enriched with saturated fatty acids (SFA) (the coconut oil-supplemented diet, COD), sturgeon maintained on a diet enriched with n-3 PUFA (the fish oil-supplemented diet, FOD) had higher myocardial 20:5(n-3) and lower 20:4(n-6) content with a consequent decrease in the n-6-to-n-3 ratio (from 0.86 to 0.25) and a lower intrinsic in vitro heart rate (22.0 ± 1.5 vs. 29.9 ± 1.0 beats/min) and cardiac power output (PO) (0.33 ± 0.08 vs. 0.48 ± 0.03 mW/g), but had a greater in vitro scope for cardiac work (almost twice the maximal-to-basal PO ratio). Reducing the oxygen supply to the hearts significantly decreased, by ∼ 40%, the maximal in vitro PO in the COD group of animals but had no effect in the FOD group. These differences in performance were not reflected in heart rate or blood pressure in vivo, either in normoxia or hypoxia. Addition of vitamin E as an antioxidant to the diets reduced intrinsic heart rate by ∼ 25% but did not influence the effects of dietary fatty acid composition on in vitro cardiac performance. The results indicate that dietary n-3 PUFA can have beneficial effects on the resistance of the fish heart to environmental stressors such as hypoxia.

Affiliations:

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Le document en format XML

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<front><div type="abstract" xml:lang="en">Agnisola, C., D. J. McKenzie, E. W. Taylor, C. L. Bolis, and B. Tota. Cardiac performance in relation to oxygen supply varies with dietary lipid composition in sturgeon. Am. J. Physiol. 271 (Regulatory Integrative Comp. Physiol. 40): R417-R425, 1996.-Dietary polyunsaturated fatty acids (PUFA) of the n-3 series that have beneficial effects on mammalian heart function are typically found at high levels in fish tissues. The effects of dietary fatty acid composition on cardiac function were investigated in the sturgeon. When compared with sturgeon maintained for 1 yr on a diet enriched with saturated fatty acids (SFA) (the coconut oil-supplemented diet, COD), sturgeon maintained on a diet enriched with n-3 PUFA (the fish oil-supplemented diet, FOD) had higher myocardial 20:5(n-3) and lower 20:4(n-6) content with a consequent decrease in the n-6-to-n-3 ratio (from 0.86 to 0.25) and a lower intrinsic in vitro heart rate (22.0 ± 1.5 vs. 29.9 ± 1.0 beats/min) and cardiac power output (PO) (0.33 ± 0.08 vs. 0.48 ± 0.03 mW/g), but had a greater in vitro scope for cardiac work (almost twice the maximal-to-basal PO ratio). Reducing the oxygen supply to the hearts significantly decreased, by ∼ 40%, the maximal in vitro PO in the COD group of animals but had no effect in the FOD group. These differences in performance were not reflected in heart rate or blood pressure in vivo, either in normoxia or hypoxia. Addition of vitamin E as an antioxidant to the diets reduced intrinsic heart rate by ∼ 25% but did not influence the effects of dietary fatty acid composition on in vitro cardiac performance. The results indicate that dietary n-3 PUFA can have beneficial effects on the resistance of the fish heart to environmental stressors such as hypoxia.</div>
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Cardiac performance in relation to oxygen supply varies in dietary lipid composition in sturgeon

Cardiac performance in relation to oxygen supply varies in dietary lipid composition in sturgeon

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

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