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Muscle enzyme release does not predict muscle function impairment after triathlon.

I Margaritis1, F Tessier, F Verdera

  • 1Laboratoire de Physiologie de l'Activité Musculaire Faculté des Sciences du Sport Université de Nice Sophia-Antipolis, France.

The Journal of Sports Medicine and Physical Fitness
|July 10, 1999
PubMed
Summary

A long distance triathlon causes muscle damage, but serum enzyme levels do not accurately reflect muscle function impairment or soreness. Recovery cannot be solely judged by enzyme activity changes after endurance events.

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Area of Science:

  • Exercise physiology
  • Biochemistry
  • Sports medicine

Background:

  • Triathlons induce significant physiological stress.
  • Understanding muscle damage markers post-endurance events is crucial for athlete recovery and performance.
  • Biochemical markers and muscle function changes after prolonged exertion require detailed kinetic analysis.

Purpose of the Study:

  • To investigate the four-day effects of a long distance triathlon on muscle damage biochemical markers.
  • To determine if these markers correlate with muscle function impairment and soreness.
  • To assess the predictive value of enzyme leakage for muscle damage severity.

Main Methods:

  • Twelve triathletes were monitored for 4 days post-race, with data collected 2 days prior.

Related Experiment Videos

  • Assessed maximal voluntary contraction (MVC), delayed onset muscle soreness (DOMS), and serum enzyme activities (CK, CK-MB, LDH, AST, ALT).
  • Compared data from triathletes to a control group (five non-participants).

    • Main Results:

    • All indirect muscle damage markers showed significant changes over time post-triathlon (p < 0.0001).
    • Maximal voluntary contraction (MVC) of knee muscles decreased significantly (p < 0.05).
    • No significant correlation was found between serum enzyme levels, DOMS, and MVC impairment.

    Conclusions:

    • Long distance triathlons cause muscle damage, but serum enzyme activity changes do not reliably indicate the extent of damage or impairment.
    • Muscle enzyme release is not a suitable predictor for the magnitude of muscle function impairment following strenuous exercise.
    • Relying solely on enzyme markers for assessing muscle recovery post-triathlon is insufficient.