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Title of Journal: Eur J Appl Physiol

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Abbravation: European Journal of Applied Physiology

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Springer-Verlag

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DOI

10.1002/phbl.19610170707

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1439-6327

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Comparison in eccentric exerciseinduced muscle da

Authors: Trevor C Chen KunYi Lin HsinLian Chen MingJu Lin Kazunori Nosaka
Publish Date: 2010/09/18
Volume: 111, Issue: 2, Pages: 211-223
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Abstract

This study tested the hypothesis that changes in indirect markers of muscle damage following maximal eccentric exercise would be smaller for the knee extensors KE and flexors KF compared with the elbow flexors EF and extensors EE A total of 17 sedentary men performed five sets of six maximal isokinetic 90° s−1 eccentric contractions of EF range of motion ROM 90°–0° 0 = full extension EE 55°–145° KF 90°–0° and KE 30°–120° using a different limb with a 4–5week interval in a counterbalanced order Changes in maximal isometric and concentric isokinetic strength optimum angle limb circumference ROM plasma creatine kinase activity and myoglobin concentration muscle soreness and echointensity of Bmode ultrasound images before and for 5 days following exercise were compared amongst the four exercises using twoway repeatedmeasures ANOVA All variables changed significantly following EF EE and KF exercises but KE exercise did not change the optimum angle limb circumference and echointensity Compared with KF and KE EF and EE showed significantly greater changes in all variables without significant differences between EF and EE Changes in all variables were significantly greater for KF than KE For the same subjects the magnitude of change in the dependent variables following exercise varied among the exercises These results suggest that the two arm muscles are equally more susceptible to muscle damage than leg muscles but KF is more susceptible to muscle damage than KE The difference in the susceptibility to muscle damage seems to be associated with the use of muscles in daily activitiesThis research was supported by the National Science Council Taiwan NSC 982410H415042 and Edith Cowan University Australia The authors would like to thanks Professor TsaiWei Huang Department of Counseling at National Chiayi University for his assistance with the statistical design and analysis

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