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Changes in urinary pH following bicarbonate loading.

D C McKenzie1

  • 1Department of Sports Science, University of British Columbia, Vancouver.

Canadian Journal of Sport Sciences = Journal Canadien Des Sciences Du Sport
|December 1, 1988
PubMed
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Sodium bicarbonate doping significantly increases urinary pH after intense exercise. This finding suggests urinary pH is a viable marker for detecting bicarbonate use in athletes.

Area of Science:

  • Sports Science
  • Biochemistry
  • Analytical Chemistry

Background:

  • Bicarbonate doping is a performance-enhancing strategy.
  • Detecting banned substances is crucial for fair competition.

Purpose of the Study:

  • To investigate the impact of sodium bicarbonate (B) on urinary pH.
  • To assess the potential of urinary pH as a biomarker for bicarbonate doping.

Main Methods:

  • Double-blind, placebo-controlled study with 65 university students.
  • Administration of sodium bicarbonate (0.3 gm/kg) or placebo.
  • Urine sample analysis for pH after an 800m run.

Main Results:

  • Urinary pH was significantly higher in the sodium bicarbonate group (7.61 ± 0.4) compared to placebo (6.17 ± 0.6).

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  • No significant difference in 800m run times between conditions.
  • Urinary pH changes were consistent across male and female participants.

    • Conclusions:

    • Sodium bicarbonate administration elevates urinary pH post-exercise.
    • Urinary pH is a potential indicator for detecting bicarbonate doping in sports.