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Related Experiment Videos

Pre-exercise hypervolemia and cycle ergometer endurance in men.

J E Greenleaf1, R Looft-Wilson, J L Wisherd

  • 1Laboratory for Human Environmental Physiology, NASA, Ames Research Center, Moffett Field, CA, USA.

Biology of Sport
|January 1, 1997
PubMed
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Consuming AstroAde, a hyperhydration drink, significantly improved endurance performance in untrained men by increasing plasma volume and potentially offering greater acid buffering. This contrasts with a carbohydrate drink or no fluid, which did not enhance performance.

Area of Science:

  • Exercise Physiology
  • Sports Nutrition
  • Human Performance

Background:

  • Fluid intake strategies are crucial for optimizing exercise performance, particularly in untrained individuals.
  • Hyperhydration and carbohydrate-electrolyte beverages are common ergogenic aids, but their comparative effects on endurance are not fully elucidated.
  • Understanding the physiological mechanisms behind fluid's impact on endurance is key to developing effective hydration protocols.

Purpose of the Study:

  • To investigate the effects of a hyperhydration drink (AstroAde) versus a carbohydrate-electrolyte drink (Performance 1) and no fluid on time to exhaustion in untrained men.
  • To examine the role of plasma volume expansion and potential ergogenic properties of fluid formulations in endurance performance.

Main Methods:

  • Five untrained men underwent time to exhaustion tests at 87-91% of peak VO2.
Keywords:
NASA Center ARCNASA Discipline Regulatory Physiology

Related Experiment Videos

  • Participants consumed either no fluid (N), Performance 1 (P1), or AstroAde (AA) at 10 ml/kg body mass.
  • Plasma volume changes, exercise metabolism (VE, RE, VO2), heart rate, perceived exertion, skin blood flow, and core temperature were monitored.

    • Main Results:

    • Mean endurance time was significantly higher with AstroAde (30.50 min) compared to no fluid (24.68 min) and Performance 1 (24.55 min).
    • AstroAde induced a significant increase in resting plasma volume (4.8%) prior to exercise, unlike the other conditions.
    • No significant differences were observed in exercise metabolism, heart rate, perceived exertion, skin blood flow, or rectal temperature across conditions.

    Conclusions:

    • Hyperhydration with AstroAde enhances endurance performance in untrained men, likely due to increased plasma volume.
    • The carbohydrate-electrolyte drink (P1) did not offer a performance benefit over no fluid, suggesting limited ergogenic effect in this context.
    • AstroAde's benefits may be attributed to plasma volume expansion, enhanced acid buffering, and potential citrate-derived energy substrate.