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Related Experiment Videos

Dehydration during exercise: what are the real dangers?

T D Noakes1

  • 1MRC/UCT Bioenergetics of Exercise Research Unit, Department of Physiology, University of Cape Town Medical School, Observatory, South Africa.

Clinical Journal of Sport Medicine : Official Journal of the Canadian Academy of Sport Medicine
|January 1, 1995
PubMed
Summary

The 1969 Wyndham and Strydom study did not find dangers from dehydration in marathon runners. In fact, the most dehydrated athletes were the most successful, challenging common beliefs about fluid intake.

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Area of Science:

  • Sports Medicine
  • Exercise Physiology
  • Endurance Sports Science

Background:

  • The belief that dehydration is dangerous for endurance athletes originated from a 1969 study.
  • This study's influence may stem from its title rather than its scientific findings.
  • The study did not identify dangers associated with inadequate water intake during marathon running.

Purpose of the Study:

  • To re-evaluate the findings of the 1969 Wyndham and Strydom study on dehydration in marathon runners.
  • To investigate the relationship between dehydration levels and athletic success in competitive running.
  • To challenge the prevailing dogma regarding the dangers of dehydration during endurance exercise.

Main Methods:

  • Analysis of the original data and conclusions from the 1969 Wyndham and Strydom study.

Related Experiment Videos

  • Examination of the relationship between dehydration and performance in elite marathon runners.
  • Review of the subsequent interpretation and influence of the study on sports medicine practices.

    • Main Results:

    • The 1969 study did not demonstrate any dangers from inadequate water intake during marathon running.
    • The most dehydrated runners in the study were the most successful, winning the races.
    • The study's findings were misinterpreted, leading to a focus on preventing dehydration.

    Conclusions:

    • The classical study on marathon running and dehydration has been widely misinterpreted.
    • There is no scientific evidence from the original study to support the claim that dehydration is inherently dangerous for marathon runners.
    • The study's results should be reconsidered to inform current practices regarding fluid intake during exercise.