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Related Experiment Videos

Phosphate loading and the effects on VO2max in trained cyclists.

I Stewart1, L McNaughton, P Davies

  • 1Centre for Physical Education, Tasmanian State Institute of Technology, Launceston, Australia.

Research Quarterly for Exercise and Sport
|March 1, 1990
PubMed
Summary

Phosphate supplementation may enhance athletic performance by increasing 2,3-diphosphoglycerate (DPG) levels, leading to improved oxygen delivery. This study found that phosphate increased 2,3-DPG and improved VO2max and time to exhaustion in cyclists.

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Area of Science:

  • Exercise Physiology
  • Biochemistry

Background:

  • Increased red blood cell 2,3-diphosphoglycerate (DPG) enhances oxygen unloading to tissues by shifting the oxyhemoglobin dissociation curve rightward.
  • Phosphate supplementation is hypothesized to improve maximal oxygen uptake (VO2max) by elevating 2,3-DPG levels.

Purpose of the Study:

  • To investigate the ergogenic effects of phosphate ingestion on VO2max, time to exhaustion, and serum 2,3-DPG levels in trained cyclists.
  • To determine if phosphate supplementation influences serum phosphate and 2,3-DPG concentrations.

Main Methods:

  • Eight trained cyclists completed three cycle ergometer tests: control, placebo, and phosphate experimental conditions.
  • Measurements included VO2max, time to exhaustion, and serum levels of phosphate and 2,3-DPG.

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Main Results:

  • Phosphate ingestion significantly increased serum 2,3-DPG levels (p < .05).
  • VO2max showed significant differences between control and placebo conditions (p < .05, p < .02 respectively).
  • Time to exhaustion also differed significantly across the three conditions (p < .05).

Conclusions:

  • Phosphate supplementation appears to have an ergogenic effect, potentially by increasing 2,3-DPG.
  • Further research is needed to determine optimal phosphate dosage and the extent of performance enhancement.