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Acid-base changes in the running greyhound: contributing variables.

R L Pieschl1, P W Toll, D E Leith

  • 1Department of Anatomy and Physiology, Kansas State University, Manhattan 66506-5602.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|December 1, 1992
PubMed
Summary
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Sprint exercise significantly alters acid-base balance in racing greyhounds. Factors like lactate, PCO2, albumin, sodium, and chloride influence hydrogen ion ([H+]) levels during and after intense activity.

Area of Science:

  • Veterinary Physiology
  • Exercise Physiology
  • Acid-Base Balance

Background:

  • Sprint exercise in racing greyhounds leads to significant physiological changes.
  • Understanding acid-base balance shifts is crucial for canine athletic performance and health.

Purpose of the Study:

  • To identify factors affecting hydrogen ion ([H+]) concentration during and after sprint exercise in racing greyhounds.
  • To apply Stewart's quantitative acid-base analysis to arterial blood plasma.

Main Methods:

  • Arterial blood plasma samples collected from greyhounds at rest, during sprint exercise, and up to 30 minutes post-exercise.
  • Measured variables included [Na+], [K+], [Cl-], [total Ca], [lactate], [albumin], [Pi], PCO2, and pH.
  • Calculated [H+] using Stewart's equations and compared with direct measurements.

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Main Results:

  • Sprint exercise caused significant changes in all measured variables.
  • Maximal changes observed: strong ion difference decreased, [albumin] increased, PCO2 fluctuated significantly, and [H+] rose from 36.6 to 76.6 nEq/L.
  • [H+] calculated via Stewart's analysis closely matched directly measured values.

Conclusions:

  • Changes in [albumin], [Na+], and [Cl-], in addition to lactate and PCO2, contribute to altered [H+] during and after sprint exercise.
  • Stewart's quantitative analysis is a valid method for assessing acid-base status in exercising greyhounds.
  • Findings provide insights into the physiological responses of canine athletes to high-intensity exercise.