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Related Experiment Videos

Effect of exercise hemoconcentration and hyperosmolality on exercise responses.

S M Fortney1, N B Vroman, W S Beckett

  • 1Stress Physiology Laboratory, Johns Hopkins School of Hygiene and Public Health, Baltimore, Maryland 21205.

Journal of Applied Physiology (Bethesda, Md. : 1985)
|August 1, 1988
PubMed
Summary

Decreased plasma volume during exercise impairs circulation and temperature regulation. Maintaining plasma volume improves these responses, while changes in osmolality have minimal impact during short-term exercise.

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Area of Science:

  • Exercise Physiology
  • Cardiovascular Regulation
  • Thermoregulation

Background:

  • Plasma volume (PV) decreases during prolonged exercise.
  • This decrease may affect circulatory and thermoregulatory functions.
  • Understanding these effects is crucial for optimizing exercise performance and safety.

Purpose of the Study:

  • To investigate the impact of reduced plasma volume and altered plasma osmolality on circulatory and thermoregulatory responses during exercise.
  • To determine if maintaining plasma volume during exercise mitigates negative physiological effects.
  • To assess the role of plasma osmolality in these responses.

Main Methods:

  • Six subjects performed moderate-intensity cycling exercise in a warm environment.
  • Control (C) condition involved exercise without fluid infusion.

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  • Infusion (INF) conditions involved maintaining pre-exercise plasma volume using albumin and varying saline concentrations (0.45%, 0.9%, 3.0%).

    • Main Results:

    • During control exercise, plasma volume decreased by 13.0%, heart rate (HR) increased, and esophageal temperature (Tes) rose.
    • In infusion studies, HR was significantly lower, and Tes was reduced compared to control.
    • Trends indicated increased skin blood flow and decreased sweating rates during infusion.
    • No significant differences in HR, Tes, or sweating rate were observed between the different saline concentrations.

    Conclusions:

    • A decrease in plasma volume during moderate exercise compromises circulatory and thermal regulation.
    • Maintaining plasma volume during exercise improves circulatory and thermoregulatory responses.
    • Increased plasma osmolality has minimal effects on these responses during short-term exercise.