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Adverse events associated with eccentric exercise protocols: six case studies.

S P Sayers1, P M Clarkson, P A Rouzier

  • 1Department of Exercise Science and the University Health Services, University of Massachusetts, Amherst 01003, USA. ssayers@excsci.umass.edu

Medicine and Science in Sports and Exercise
|December 29, 1999
PubMed
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Eccentric exercise can cause severe muscle damage, including prolonged strength loss and swelling. Researchers must be aware of these risks and take precautions during studies on muscle damage.

Area of Science:

  • Exercise physiology
  • Muscle damage research

Background:

  • Eccentric exercise is used to study muscle damage.
  • Severe rhabdomyolysis is rare but dangerous.

Observation:

  • Case studies involved maximal eccentric actions of elbow flexors.
  • Two sets of 25 repetitions with a 5-min rest were performed.

Findings:

  • Prolonged force loss (43-47 days) observed.
  • Extreme arm swelling lasting weeks reported.
  • Elevated serum creatine kinase levels noted.

Implications:

  • Adverse events from eccentric exercise are rare but documented.
  • A 3% incidence rate was observed in one lab.
  • Researchers need to understand and mitigate risks of high-force eccentric exercise.

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