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Related Experiment Videos

Exercise intensity and erythrocyte 2,3-diphosphoglycerate concentration.

S S Hsieh, P S Freedson, M C Mroz

    Medicine and Science in Sports and Exercise
    |February 1, 1986
    PubMed
    Summary

    Higher intensity exercise (75% VO2max) significantly increased erythrocyte 2,3-diphosphoglycerate (2,3-DPG) and lactic acid levels in females. These changes persisted post-exercise, highlighting the impact of exercise intensity on oxygen transport molecules.

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    Area of Science:

    • Exercise Physiology
    • Biochemistry
    • Sports Science

    Background:

    • Erythrocyte 2,3-diphosphoglycerate (2,3-DPG) influences oxygen release from hemoglobin.
    • Exercise intensity is a key factor affecting physiological responses.
    • Understanding 2,3-DPG changes during exercise is crucial for performance and adaptation.

    Purpose of the Study:

    • To investigate the acute effects of two distinct exercise intensities (35% and 75% VO2max) on erythrocyte 2,3-DPG concentration.
    • To assess the impact of exercise intensity on lactic acid and hematological parameters.
    • To determine the time course of these changes post-exercise.

    Main Methods:

    • Thirty-one female participants completed 15-minute cycling tests at 35% and 75% VO2max.
    • Blood samples were collected pre-exercise, immediately post-exercise, and at 15 and 30 minutes post-exercise.

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  • Measurements included lactic acid, 2,3-DPG, hemoglobin, and hematocrit.

    • Main Results:

    • The 75% VO2max intensity significantly increased lactic acid and 2,3-DPG concentrations.
    • Plasma volume-corrected 2,3-DPG (PVC 2,3-DPG) also increased significantly after 75% VO2max exercise.
    • Elevated lactic acid and PVC 2,3-DPG persisted 30 minutes post-exercise at 75% VO2max.
    • No significant exercise intensity effect was found for 2,3-DPG itself, but a time-intensity interaction for PVC 2,3-DPG was observed.

    Conclusions:

    • Higher intensity exercise (75% VO2max) acutely elevates erythrocyte 2,3-DPG and lactic acid in females.
    • The increase in PVC 2,3-DPG suggests a role in modulating oxygen transport during and after intense exercise.
    • These physiological adaptations are intensity-dependent and have implications for oxygen delivery.