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Related Experiment Videos

Plasma volume changes in response to resistive exercise

R R Kraemer1, J L Kilgore, G R Kraemer

  • 1Department of HPED, Southeastern Louisiana University, Hammond.

The Journal of Sports Medicine and Physical Fitness
|September 1, 1993
PubMed
Summary

Resistive exercise significantly reduces plasma volume, decreasing by up to 13.35% during a session. This plasma volume loss returns to normal levels within 15 minutes of recovery.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Physiology

Background:

  • Understanding fluid shifts during exercise is crucial for interpreting physiological responses.
  • Previous research has not fully quantified plasma volume changes during a comprehensive resistive exercise session.

Purpose of the Study:

  • To determine the cumulative effects of four sequential resistive exercises on intravascular plasma volume.
  • To quantify the magnitude and time course of plasma volume reduction during and after resistance training.

Main Methods:

  • Seven healthy males underwent a resistance exercise protocol including bench press, lat pull, leg extension, and leg curl.
  • Blood samples were collected pre-exercise, during, and post-exercise (up to 25 minutes recovery) to measure plasma volume.

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  • One-repetition maximum (1-RM) and 10-RM were determined for exercise prescription.

    • Main Results:

    • Plasma volume was reduced significantly during the exercise session, with a maximum reduction of -13.35% observed after leg extension.
    • Plasma volume returned to baseline levels by 15 minutes into the recovery period.
    • The study highlights substantial plasma volume loss induced by a short resistance exercise session.

    Conclusions:

    • A short, intense session of upper and lower body resistive exercises leads to a significant reduction in plasma volume.
    • These findings emphasize the importance of considering plasma volume fluctuations when analyzing blood parameters in response to resistance exercise.
    • Accurate interpretation of exercise-induced physiological markers requires accounting for exercise-induced hemoconcentration.