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Medical and physiological considerations in triathlons.

W D Hiller, M L O'Toole, E E Fortess

    The American Journal of Sports Medicine
    |March 1, 1987
    PubMed
    Summary

    Medical issues in triathlons are common, especially in longer races like the Ironman. Dehydration and heat exhaustion are frequent, with hyponatremia a significant risk in ultraendurance events.

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    Area of Science:

    • Sports Medicine
    • Exercise Physiology
    • Endurance Sports Research

    Background:

    • Triathlons, encompassing swimming, cycling, and running, are increasingly popular in the US.
    • These events range from 30 minutes to 36 hours, often in hot conditions.
    • Limited research exists on the medical and physiological aspects of triathlons.

    Purpose of the Study:

    • To analyze medical complications across different triathlon distances.
    • To investigate the incidence of hyponatremia in ultraendurance triathletes.
    • To provide data on athlete health and safety in competitive multisport events.

    Main Methods:

    • Retrospective analysis of medical records from three types of triathlons: USTS, Ironman Qualifier (IQ), and Hawaii Ironman World Championships.

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  • Prospective electrolyte study involving blood sample analysis pre- and post-race for selected athletes.
  • Data collection spanned multiple years (1982-1986) and participant numbers (1,000 to 4,583 starters per race).

    • Main Results:

    • Medical treatment was required by <2% of USTS starters, ~10% of IQ starters, and an average of 17% of Ironman finishers.
    • Dehydration and heat exhaustion were the most common issues in shorter races.
    • Hyponatremia affected 27% of athletes studied after the Ironman, compared to 0% after the USTS race.

    Conclusions:

    • Medical complication rates increase with triathlon distance and duration.
    • Hyponatremia is a significant risk for ultraendurance triathletes, necessitating further investigation and preventative strategies.
    • Understanding these physiological challenges is crucial for athlete safety and performance in endurance sports.