Abstract
Purpose
This study compared changes in indirect muscle damage markers after maximal eccentric exercise of the elbow flexors (EF) among pre-adolescent (9–10 years), adolescent (14–15 years) and post-adolescent (20–25 years) men to test the hypothesis that the magnitude of muscle damage would increase with increase in age.
Methods
Thirteen untrained men of each age group performed two bouts (ECC1, ECC2) of 30 maximal EF eccentric contractions. Several indirect muscle damage markers were measured from the exercised arm before, immediately after, and 1–5 days post-exercise. Changes in maximal voluntary concentric contraction torque of the EF (MVC), range of motion of the elbow joint, upper arm circumference (CIR), muscle passive stiffness, muscle soreness, plasma creatine kinase activity and myoglobin concentration after ECC1 and ECC2 were compared amongst groups by a mixed-design two-way ANOVA.
Results
MVC before exercise was smaller (P < 0.05) for pre-adolescent (8.9 ± 1.9 Nm) than adolescent (25.1 ± 3.9 Nm) and adult (35.3 ± 4.6 Nm), and for adolescent than adult. Changes in all variables after ECC1 were smaller (P < 0.05) for pre-adolescent and adolescent when compared with adult, and all except CIR changes were smaller (P < 0.05) for pre-adolescent than adolescent. After ECC2, changes in all variables were smaller (P < 0.05) than those after ECC1 for all groups, but the magnitude of the changes was different among groups (P < 0.05) in the same way as that after ECC1.
Conclusion
These results indicate that the magnitude of muscle damage is increased from pre-adolescent, adolescent to post-adolescent men.





Abbreviations
- ANOVA:
-
Analysis of variance
- AUC:
-
The area under the curve
- BMI:
-
Body mass index
- CIR:
-
Upper arm circumference
- CK:
-
Creatine kinase
- CV:
-
Coefficient of variation
- DOMS:
-
Delayed onset muscle soreness
- EDTA:
-
Ethylenediaminetetraacetic acid
- ECC1:
-
The first bout of maximal eccentric exercise
- ECC2:
-
The second bout of maximal eccentric exercise
- Mb:
-
Myoglobin
- MPS:
-
Muscle passive stiffness
- MVC:
-
Maximal voluntary contraction
- MVC–EE:
-
Maximal voluntary isokinetic concentric contraction torque of the elbow extensors
- MVC–EF:
-
Maximal voluntary isokinetic concentric contraction torque of the elbow flexors
- PTA:
-
Peak torque angle
- R:
-
An intraclass correlation coefficient
- RM:
-
Repetition maximum
- ROM:
-
Range of motion
- SOR:
-
Muscle soreness
- VAS:
-
Visual analogue scale
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Acknowledgments
We would like to dedicate this article to Professor Priscilla M. Clarkson (University of Massachusetts) who passed away on 25th of August 2013. She has been mentoring and inspiring us for more than 20 years, and our passion on muscle damage research was given by her. We thank Mr. Shueh-Chien Ko for his assistance in data collection, and Mr. Cheng-Yuang Lu for his assistance in subject recruitment. This research was supported by the National Science Council (NSC 101-2628-H-415-001), “Aim for the Top University Plan” of National Taiwan Normal University and the Ministry of Education, TAIWAN.
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The authors declare that we have no any potential conflict of interest.
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The authors declare that the experiments comply with the current laws of the country in which we were performed.
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Communicated by William J. Kraemer.
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Chen, T.C., Chen, HL., Liu, YC. et al. Eccentric exercise-induced muscle damage of pre-adolescent and adolescent boys in comparison to young men. Eur J Appl Physiol 114, 1183–1195 (2014). https://doi.org/10.1007/s00421-014-2848-3
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DOI: https://doi.org/10.1007/s00421-014-2848-3