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Oxygen debt: Involvement of the Cori cycle

Internationale Zeitschrift für angewandte Physiologie einschließlich Arbeitsphysiologie volume 28, pages 105–119 (1970)Cite this article

Summary

Tryptophan and quinolinic acid, inhibitors of gluconeogenesis, were used to block the removal of lactate by the liver in order to investigate the involvement of the Cori cycle in oxygen debt. Five male, mongrel dogs were run on a treadmill at 4 mph with a 20 percent grade for 19 min. The mean exercise\(\dot V_{O_2 }\) was 80.67±3.11 ml/kg/min for the control tests while peak arterial lactate values ranged from 3.83 to 4.98 mM/l. When removal of lactate by the liver was blocked, oxygen debt showed a mean reduction of 44 percent. Moreover, oxygen consumption during the last minute of exercise was reduced by 11 percent.

Fasting (72 h) was used in 1 dog to prevent the accumulation of lactate during exercise. This procedure reduced oxygen debt to the same level as when the removal of lactate by the liver was blocked with tryptophan and quinolinic acid.

The data show that the lactacid as well as the alactacid component is involved in oxygen debt when lactate is being removed by the liver during the recovery period following exercise.

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Affiliations

  1. Exercise Physiology Laboratory, University of Iowa, Iowa City, Iowa

    R. James Barnard,  Merle L. Foss & Charles M. Tipton

  2. Department of Medicine, U.C.L.A. School of Medicine, 90024, Los Angeles, California, USA

    R. James Barnard

  3. Department of Physical Education, University of Michigan, Ann Arbor, Michigan, USA

    Merle L. Foss

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  1. R. James Barnard
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Barnard, R.J., Foss, M.L. & Tipton, C.M. Oxygen debt: Involvement of the Cori cycle. Int. Z. Angew. Physiol. Einschl. Arbeitsphysiol. 28, 105–119 (1970). https://doi.org/10.1007/BF00698050

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  • DOI: https://doi.org/10.1007/BF00698050

Key-Words

  • Gluconeogenesis
  • Lactic Acid
  • Tryptophan
  • Quinolinic Acid
  • Alactacid Debt