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ORIGINAL PAPER J. Hansen H. Gesser J. Altimiras
 

Summary: ORIGINAL PAPER
J. Hansen H. Gesser J. Altimiras
Mechanical efficiency of the trout heart during volume
and pressure-loading: metabolic implications
of the stiffness of the ventricular tissue
Accepted: 27 April 2002 / Published online: 22 June 2002
Springer-Verlag 2002
Abstract In the mammalian heart the metabolic costs of
pressure loading exceed those of volume loading. As
evidence suggests that the opposite may be true in fish,
we evaluated the metabolic costs of volume and pressure
loading in the isolated trout heart and compared the
results with the mammalian heart based on the biome-
chanical properties of cardiac muscle. The highest power
output (2.330.32 mW g1
, n=5) appeared at the
highest preload pressure tested (0.3 kPa) and at an af-
terload of 5 kPa. At a higher afterload, power did not
increase because stroke volume fell. The highest me-
chanical efficiency (20.72.0%, n=5) was obtained at a

  

Source: Altimiras, Jordi - Department of Biology, Linkpings Universitet

 

Collections: Environmental Sciences and Ecology