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Related Experiment Videos

Rat splanchnic net oxygen consumption, energy implications.

J Casado1, J A Fernández-López, M Esteve

  • 1Department de Bioquímica i Fisiologia, Universitat de Barcelona, Spain.

The Journal of Physiology
|December 1, 1990
PubMed
Summary
This summary is machine-generated.

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Liver and intestine metabolism significantly impact energy expenditure calculations. Bicarbonate production requires correction for accurate oxygen balance assessment in rats, revealing lower energy output equivalencies.

Area of Science:

  • Physiology
  • Metabolic Research
  • Animal Studies

Background:

  • Accurate assessment of organ energy metabolism is crucial for understanding whole-body energy expenditure.
  • Oxygen consumption is a common metric, but its interpretation can be complicated by metabolic byproducts.
  • Interorgan metabolic interactions, particularly involving the liver and intestine, play a significant role in energy balance.

Purpose of the Study:

  • To quantify oxygen and bicarbonate balance in the portal vein, hepatic artery, and suprahepatic veins of rats under fed and starved conditions.
  • To determine the contribution of intestinal and hepatic metabolism to overall energy expenditure.
  • To evaluate the accuracy of using oxygen consumption as a direct energy equivalent, considering bicarbonate production.

Main Methods:

Related Experiment Videos

  • Measurement of blood flow, PO2, pH, and PCO2 in key abdominal vessels.
  • Calculation of net oxygen and bicarbonate balances for the intestine, liver, and splanchnic region.
  • Measurement of whole-animal oxygen consumption under comparable physiological states.

Main Results:

  • Both liver and intestine consistently produced significant net bicarbonate balances across all tested conditions.
  • Direct oxygen balance calculations overestimated energy output; correction for bicarbonate production reduced energy equivalency by 11-54%.
  • The intestine and liver together consumed approximately half of the total oxygen in basal states, with intestinal consumption remaining stable at ~15%.

Conclusions:

  • Oxygen balance alone is an inaccurate measure of energy metabolism due to interorgan proton transfer via bicarbonate.
  • Bicarbonate production by the liver and intestine necessitates correction for accurate energy expenditure calculations.
  • Intestinal and hepatic oxygen consumption represent a substantial portion of the body's total energy demand.