PMID: 11916108Mar 28, 2002Paper

Oxygen consumption and force development in turtle and trout cardiac muscle during acidosis and high extracellular potassium

Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology
A Kalinin, H Gesser

Abstract

Relative to species such as rainbow trout, freshwater turtle shows a high tolerance to challenges involving acidosis and increases in extracellular K+. Therefore, the effects of acidosis or high K+ on twitch force and oxygen consumption were examined in ventricular ring preparations from these two species. The oxygen consumption associated with force development was estimated by net oxygen consumption (oxygen consumption during twitch force development minus that during rest). For turtle, elevation of CO2 from 2% (pH 7.7) to 12% (pH 6.9) in the gas equilibrating the muscle bath decreased twitch force by 20% without any effects on oxygen consumption. Decreasing pH from 7.7 to 6.9 with 22 mM lactic acid had similar effects. For trout, CO2-induced acidosis decreased twitch force by approximately 60%. Furthermore, force development became energetically less efficient as it fell disproportionately more than net oxygen consumption. This was not observed for lactic acidosis. For trout but not for turtle, acidosis resulted in an increase in oxygen consumption during rest. An increase in extracellular K+ from 2.5 mM to 10 mM depressed force and oxygen consumption proportionately for both species. Adrenaline (10 microM) increased twitch ...Continue Reading

Citations

May 11, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·D Rytter, H Gesser
Nov 18, 2016·The Journal of Experimental Biology·Andreas EkströmNicolas Pichaud
Apr 30, 2016·Annual Review of Plant Biology·Bob B Buchanan
Nov 11, 2019·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Andreas EkströmErik Sandblom
May 26, 2017·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Elenor F Henry, Tyson J MacCormack
Mar 28, 2021·Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology·André G LopesAna L Kalinin

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