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Concurrent strength and endurance training. A review.

M Leveritt1, P J Abernethy, B K Barry

  • 1Centre for Sport and Exercise Science, Waikato Polytechnic, Hamilton, New Zealand. scmdl@twp.ac.nz

Sports Medicine (Auckland, N.Z.)
|January 7, 2000
PubMed
Summary

Concurrent strength and endurance training may hinder strength gains. This occurs due to conflicting muscle adaptations (chronic hypothesis) or fatigue from endurance exercise (acute hypothesis), limiting overall strength development.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Muscle Adaptation

Background:

  • Concurrent training, combining strength and endurance exercise, is popular but may inhibit strength development compared to strength training alone.
  • Current understanding of the mechanisms behind this strength inhibition is limited due to study design variations.

Purpose of the Study:

  • To review and discuss the proposed chronic and acute hypotheses explaining strength inhibition during concurrent training.
  • To highlight the need for further systematic research to clarify these mechanisms and inform optimal training strategies.

Main Methods:

  • Review of existing literature on concurrent training and its effects on strength development.
  • Analysis of proposed chronic and acute hypotheses, citing supporting and contradictory evidence.

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  • Identification of methodological challenges in comparing concurrent training studies.
  • Main Results:

    • The chronic hypothesis suggests skeletal muscle cannot simultaneously adapt optimally to both training types, supported by differing muscle fiber type and size changes.
    • The acute hypothesis posits that residual fatigue from endurance training impairs strength training performance and long-term gains.
    • Peripheral fatigue factors like muscle damage and glycogen depletion are implicated in the acute hypothesis.

    Conclusions:

    • Concurrent training presents a complex challenge to strength development, with both chronic and acute inhibitory mechanisms likely playing a role.
    • Systematic research is crucial to quantify inhibition and develop training protocols that mitigate negative effects on strength.
    • Understanding these mechanisms can help optimize training for individuals seeking both strength and endurance improvements.