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Induction and Assessment of Exertional Skeletal Muscle Damage in Humans
Published on: December 11, 2016
Comparison in eccentric exercise-induced muscle damage among four limb muscles
Trevor C Chen1, Kun-Yi Lin, Hsin-Lian Chen
1Department of Physical Education, National Chiayi University, 85 Wenlong Village, Minsyong Township, Chiayi County, 62103, Taiwan. trevorchen@mail.ncyu.edu.tw
European Journal of Applied Physiology
|September 21, 2010
Summary
Eccentric exercise causes more muscle damage in arm muscles (elbow flexors and extensors) than leg muscles (knee flexors and extensors). Knee flexors showed more damage than knee extensors, possibly due to daily activity levels.
Area of Science:
- Exercise Physiology
- Muscle Physiology
- Sports Science
Background:
- Eccentric exercise is known to induce muscle damage.
- The susceptibility of different muscle groups to exercise-induced muscle damage (EIMD) can vary.
- Understanding these differences is crucial for training and rehabilitation.
Purpose of the Study:
- To compare the extent of muscle damage in elbow flexors (EF) and extensors (EE) versus knee flexors (KF) and extensors (KE) following maximal eccentric exercise.
- To investigate if daily activity levels influence muscle susceptibility to damage.
Main Methods:
- 17 sedentary men performed maximal eccentric contractions on EF, EE, KF, and KE using different limbs.
- Indirect markers of muscle damage were measured for 5 days post-exercise.
- Markers included strength, limb circumference, range of motion, plasma creatine kinase, myoglobin, soreness, and ultrasound echo-intensity.
Main Results:
- EF and EE showed significantly greater changes in all measured variables compared to KF and KE.
- KF exhibited greater changes than KE.
- KE exercise did not significantly alter optimum angle, limb circumference, or echo-intensity.
Conclusions:
- Arm muscles (EF and EE) are more susceptible to muscle damage than leg muscles (KF and KE).
- Knee flexors are more susceptible to damage than knee extensors.
- Differences in susceptibility may be linked to the muscles' roles in daily activities.
