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[Nutrient utilization during cold exposure and adaptation]

P Srámek1, B Ulicný, L Janská

  • 1Katedra tĕlovýchovného lékarství, Fakulta tĕlesné výchovy a sportu UK, Praha.

Casopis Lekaru Ceskych
|May 3, 1995
PubMed
Summary
This summary is machine-generated.

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Repeated cold water immersion in athletes shifts energy metabolism from carbohydrates to a mixed fuel source. This adaptation helps manage energy demands during cold exposure after acclimation.

Area of Science:

  • Sports Physiology
  • Environmental Adaptation
  • Metabolic Research

Context:

  • Repeated cold exposure alters physiological defense mechanisms, with metabolic, thermogenic, and insulation responses predominating.
  • Athletes undergoing cold water acclimation exhibit specific adaptational responses to environmental stressors.
  • Understanding these adaptations is crucial for optimizing performance and safety in cold conditions.

Purpose:

  • To investigate the predominant adaptive response in athletes repeatedly exposed to cold water.
  • To elucidate the metabolic processes supporting adaptation to cold environments in sportsmen.
  • To determine how energy metabolism shifts during cold acclimation in athletes.

Summary:

  • Athletes were immersed in 14°C water thrice weekly for one month. Before acclimation, cold exposure significantly dropped blood sugar; post-acclimation, it increased slightly. Oxygen consumption doubled during immersion irrespective of adaptation stage.

Related Experiment Videos

  • Metabolic turnover decreased post-acclimation, indicating improved energy efficiency. Non-esterified fatty acids showed minor changes, while thyroid hormones remained largely unaffected.
  • Analysis of blood sugar, respiratory quotient, and fatty acid levels suggests a shift from carbohydrate reliance to a mixed energy source post-acclimation.

    • Impact:

    • Findings indicate a metabolic adaptation in athletes, reducing carbohydrate dependence for energy during cold exposure.
    • The study highlights a shift towards a mixed fuel strategy (carbohydrates and fats) for meeting energy demands after cold acclimation.
    • Results provide insights into physiological adjustments for cold water sports and environmental adaptation strategies.