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Related Experiment Videos

Urea production during prolonged swimming.

P W Lemon1, D T Deutsch, W R Payne

  • 1Applied Physiology Research Laboratory, Kent State University, Ohio 44242.

Journal of Sports Sciences
|January 1, 1989
PubMed
Summary

Male swimmers experienced elevated serum urea after training, suggesting increased amino acid oxidation during intense exercise. Reduced sweat and urine output partially explained this, but prolonged nitrogen excretion may also be involved.

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Area of Science:

  • Sports Medicine
  • Exercise Physiology
  • Biochemistry

Background:

  • Understanding physiological responses to intense swimming is crucial for athlete performance and health.
  • Previous research indicates dehydration and altered nitrogen metabolism during prolonged exercise.

Purpose of the Study:

  • To investigate the changes in urea nitrogen metabolism and fluid balance in male interscholastic swimmers after a high-volume training swim.

Main Methods:

  • Eight male swimmers completed a 4572 m swim.
  • Measurements included heart rate, blood lactate, sweat rate, serum urea nitrogen, and urine volume.
  • Analysis of pre- and post-swim physiological markers.

Main Results:

  • Swimmers exhibited elevated post-swim serum urea nitrogen (11.6 mM vs. 4.6 mM pre-swim).
  • Sweat rate was lower during swimming (0.48 L/h) compared to cycling or running.
  • Reduced urine volume post-swim led to delayed urea nitrogen excretion.

Conclusions:

  • Intense swimming appears to increase urea production, likely due to enhanced amino acid oxidation.
  • Reduced fluid loss during swimming contributes to elevated serum urea, but does not fully explain the increase.
  • Prolonged or alternative nitrogen excretion pathways may exist post-exercise.

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