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Voluntary muscle function after creatine supplementation in acute hypobaric hypoxia.

Carol J Baker-Fulco1, Charles S Fulco, Mark D Kellogg

  • 1Military Nutrition Division, U.S. Army Research Institute of Environmental Medicine, Natick, MA 01760-5007, USA. carol.baker-fulco@na.amedd.army.mil

Medicine and Science in Sports and Exercise
|August 5, 2006
PubMed
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Creatine supplementation did not enhance muscle performance or endurance in healthy men during simulated high-altitude conditions. This study found no significant benefits of creatine for maximal force, muscle endurance, or recovery in either normoxia or hypobaric hypoxia.

Area of Science:

  • Exercise Physiology
  • Nutritional Supplementation
  • Altitude Training

Background:

  • Hypobaric hypoxia, simulating high-altitude environments, can impair muscle performance.
  • Creatine supplementation is known to enhance muscle energy metabolism and performance in normoxic conditions.

Purpose of the Study:

  • To investigate the efficacy of creatine supplementation in improving muscle performance under acute hypobaric hypoxic conditions.
  • To assess creatine's impact on maximal voluntary contractions (MVCs) and muscle endurance during simulated altitude exposure.

Main Methods:

  • A double-blind, randomized crossover study involving seven healthy men.
  • Participants underwent supplementation with creatine or placebo, followed by muscle performance tests in normoxia and hypobaric hypoxia.

Related Experiment Videos

  • Muscle performance was evaluated through submaximal and maximal intermittent static knee contractions to exhaustion.

    • Main Results:

    • Creatine supplementation did not significantly alter maximal voluntary contraction force in either normoxic or hypobaric hypoxic conditions.
    • Muscle endurance, measured by time to exhaustion, was reduced in hypobaric hypoxia compared to normoxia but was not affected by creatine supplementation.
    • Recovery of MVC force between exercise bouts was similar across all conditions, irrespective of creatine or environmental factors.

    Conclusions:

    • Creatine supplementation demonstrated no ergogenic effect on maximal force, muscle endurance, or recovery during acute hypobaric hypoxia in healthy men.
    • The findings suggest that creatine's benefits may be limited in environments with reduced oxygen availability.
    • Further research is warranted to explore creatine's potential role in different hypoxic intensities or durations.