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• W2170707933 endingPage "1935" @default.
• W2170707933 startingPage "1927" @default.
• W2170707933 abstract "SUMMARY Cardiac preload (central venous pressure, Pcv), mean circulatory filling pressure (MCFP), dorsal aortic blood pressure(Pda) and relative cardiac output(Q̇) were measured in sea bass(Dicentrarchus labrax) at rest and while swimming at 1 and 2 BL s-1. MCFP, an index of venous capacitance and the upstream venous pressure driving the return of venous blood to the heart, was measured as the plateau in Pcv during ventral aortic occlusion. Compared with resting values, swimming at 1 and 2 BLs-1 increased Q̇ (by 15±1.5 and 38±6.5%, respectively), Pcv (from 0.11±0.01 kPa to 0.12±0.01 and 0.16±0.02 kPa,respectively), MCFP (from 0.27±0.02 kPa to 0.31±0.02 and 0.40±0.04 kPa, respectively) and the calculated pressure gradient for venous return (ΔPv, from 0.16±0.01 kPa to 0.18±0.02 and 0.24±0.02 kPa, respectively), but not Pda. In spite of an increased preload, the increase in Q̇ was exclusively mediated by an increased heart rate (fh, from 80±4 beats min-1 to 88±4 and 103±3 beats min-1,respectively), and stroke volume (Vs) remained unchanged. Prazosin treatment (1 mg kg-1Mb) abolished pressure and flow changes during swimming at 1 BL s-1, but not 2 BL s-1, indicating that other control systems besides an α-adrenoceptor control are involved. This study is the first to address the control of venous capacitance in swimming fish. It questions the generality that increased Q̇ during swimming is regulated primarily through Vs and shows that an increased cardiac filling pressure does not necessarily lead to an increased Vs in fish, but may instead compensate for a reduced cardiac filling time." @default.
• W2170707933 created "2016-06-24" @default.
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• W2170707933 date "2005-05-15" @default.
• W2170707933 modified "2023-10-17" @default.
• W2170707933 title "Cardiac preload and venous return in swimming sea bass (<i>Dicentrarchus labrax</i>L.)" @default.
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• W2170707933 doi "https://doi.org/10.1242/jeb.01606" @default.
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