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Repeated eccentric exercise bouts do not exacerbate muscle damage and repair
1Exercise and Sports Science, Graduate School of Integrated Science, Yokohama City University, Yokohama, Japan. nosaka@vc-net.ne.jp.
Journal of Strength and Conditioning Research
|February 9, 2002
Summary
Repeated bouts of eccentric exercise, even when performed 2 and 4 days after an initial session, did not worsen muscle damage or hinder recovery. Subsequent exercise sessions did not exacerbate damage compared to a single session.
Area of Science:
- Exercise Physiology
- Muscle Physiology
- Sports Medicine
Background:
- Eccentric exercise is known to cause muscle damage.
- The effects of repeated bouts of eccentric exercise on muscle damage and recovery are not fully understood.
Purpose of the Study:
- To investigate if repeated bouts of eccentric exercise exacerbate muscle damage and affect recovery.
- To compare the effects of single versus repeated bouts of eccentric elbow flexor exercise.
Main Methods:
- Participants performed a single bout of eccentric exercise (ECC1).
- A separate group performed repeated bouts (ECC2, ECC3) 2 and 4 days after ECC1.
- Measurements included maximal isometric force (MIF), range of motion (ROM), upper arm circumference, muscle soreness, and plasma creatine kinase (CK) activity.
Main Results:
- Maximal isometric force, range of motion, and upper arm circumference changes were similar immediately after each bout in the repeated condition.
- No significant differences in recovery markers (MIF, ROM, soreness, CK) were observed between single and repeated bout conditions when excluding immediate post-exercise effects of ECC2 and ECC3.
- Repeated bouts of eccentric exercise did not exacerbate muscle damage or impede the recovery process.
Conclusions:
- Subsequent eccentric exercise bouts performed 2 and 4 days after an initial bout do not worsen muscle damage.
- The recovery process from eccentric exercise is not negatively affected by repeated bouts within a short timeframe.