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Related Experiment Videos

How long does the protective effect on eccentric exercise-induced muscle damage last?

K Nosaka1, K Sakamoto, M Newton

  • 1Exercise and Sports Science, Graduate School of Integrated Science, Yokohama City University, Yokohama, Japan. nosaka@yokohma-cu.ac.jp

Medicine and Science in Sports and Exercise
|August 31, 2001
PubMed
Summary

The repeated bout effect, which reduces muscle damage from eccentric exercise, lasts at least six months but is lost between nine and twelve months. This adaptation is crucial for understanding exercise recovery.

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Area of Science:

  • Exercise Physiology
  • Muscle Adaptation
  • Sports Science

Background:

  • Eccentric exercise can induce muscle damage.
  • A single bout of eccentric exercise confers a protective adaptation against subsequent bouts.
  • The duration of this repeated bout effect is not well understood.

Purpose of the Study:

  • To determine the maximal duration of the adaptation that attenuates muscle damage after high-force eccentric exercise.
  • To investigate how long the protective effects of a prior eccentric exercise bout persist.

Main Methods:

  • 35 male students performed two bouts of eccentric elbow flexor exercise separated by 6, 9, or 12 months.
  • Measured maximal isometric force (MIF), range of motion (ROM), upper arm circumference (CIR), muscle soreness (SOR), and plasma creatine kinase (CK).

Related Experiment Videos

  • Utilized magnetic resonance (MR) imaging to assess muscle changes, comparing responses between the first and second exercise bouts.

    • Main Results:

    • A repeated bout effect was observed at 6 and 9 months, indicated by faster recovery in MIF and reduced muscle damage markers (SOR, CIR, CK, MR T2 relaxation time) at 6 months.
    • The protective effect was evident for most measures at 6 months and persisted for some at 9 months.
    • No significant repeated bout effect was found at 12 months or for ROM at any time point.

    Conclusions:

    • The repeated bout effect, reducing muscle damage from eccentric exercise, persists for at least 6 months.
    • This protective adaptation is lost between 9 and 12 months following the initial eccentric exercise bout.
    • Understanding the time course of this adaptation is important for training and recovery protocols.