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Repeated Bout Effect in Muscle-Specific Exercise Variations.

Michael C Zourdos1, Paul C Henning, Edward Jo

  • 11Department of Exercise Science and Health Promotion, Florida Atlantic University, Boca Raton, Florida; 2Military Performance Division, U.S. Army Research Institute of Environmental Medicine, Natick, Massachusetts; 3Department of Kinesiology and Health Promotion, California State Polytechnic University, Pomona, California; 4Department of Nutrition, Food, and Exercise Sciences, The Florida State University, Tallahassee, Florida; 5Department of Health and Sport Sciences, The University and Memphis, Memphis, Tennessee; 6Department of Nutrition and Exercise Physiology, University of Missouri, Columbia, Missouri; and 7School of Exercise and Health Sciences, Centre for Exercise and Sports Science Research, Edith Cowan University, Joondalup, WA, Australia.

Journal of Strength and Conditioning Research
|February 4, 2015
PubMed
Summary
This summary is machine-generated.

The repeated bout effect (RBE) protects muscles from damage. Varying exercises between sessions did not alter this protective effect, indicating RBE is not exercise-specific.

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Area of Science:

  • Exercise Physiology
  • Muscle Adaptation

Background:

  • A single exercise bout offers protection against subsequent muscle damage (repeated bout effect).
  • The impact of varying exercises between sessions on this protective effect is not well understood.

Purpose of the Study:

  • To investigate if changing the specific muscle exercise between two sessions affects the magnitude of the repeated bout effect.
  • To determine if the repeated bout effect is specific to the exact exercise performed.

Main Methods:

  • Twenty untrained males performed two sessions of elbow flexor exercise separated by seven days.
  • One group performed the same incline curls twice (Fixed Exercise), while the other performed incline curls then preacher curls (Varied Exercise).
  • Muscle strength, range of motion, soreness, and creatine kinase levels were measured across both sessions.

Main Results:

  • Both groups showed significant changes in strength, range of motion, and soreness over time within and between sessions.
  • Both groups experienced faster recovery of range of motion and soreness after the second session compared to the first.
  • No significant differences in the repeated bout effect were observed between the fixed and varied exercise groups.

Conclusions:

  • The protective effect of an initial exercise bout on subsequent muscle damage is not exercise-specific.
  • Performing a different, but related, exercise in a second session still elicits a similar protective response.
  • This suggests that the repeated bout effect is a general adaptation rather than specific to the precise movement pattern.