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Related Experiment Videos

Eccentric training does not increase sarcomere number in rabbit dorsiflexor muscles

T J Koh1, W Herzog

  • 1Faculty of Kinesiology, University of Calgary, AB, Canada. tkoh@physci.ucla.edu

Journal of Biomechanics
|September 4, 1998
PubMed
Summary

Eccentric muscle training showed minimal impact on sarcomere number, challenging the idea that this training method increases muscle fiber length. This study found little to no change in sarcomere addition, suggesting other mechanisms may be involved in muscle adaptation.

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Area of Science:

  • Muscle physiology
  • Exercise science
  • Skeletal muscle adaptation

Background:

  • Muscle hypertrophy and adaptation are complex processes.
  • Eccentric muscle contractions are known to cause muscle damage and subsequent repair.
  • Previous speculation suggested eccentric training might increase sarcomere number.

Purpose of the Study:

  • To test the hypothesis that eccentric muscle training induces serial sarcomere addition.
  • To investigate the effect of eccentric training on sarcomere number in specific rabbit leg muscles.

Main Methods:

  • Eccentric training protocol applied to rabbit dorsiflexor muscles.
  • Training involved 50 maximal contractions, twice weekly for 12 weeks.
  • Sarcomere number was measured in fascicles of the tibialis anterior and extensor digitorum longus muscles.

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Main Results:

  • A modest 3% increase in sarcomere number was observed in superficial tibialis anterior fascicles.
  • No significant change in sarcomere number was found in deep tibialis anterior fascicles.
  • Sarcomere number remained unchanged in proximal and distal extensor digitorum longus fascicles.

Conclusions:

  • Eccentric training had a negligible effect on sarcomere number in the tested muscles.
  • The findings do not support the hypothesis that eccentric training leads to significant serial sarcomere addition.
  • Alternative mechanisms may underlie muscle adaptation to eccentric exercise.