Two maximal isometric contractions attenuate the magnitude of eccentric exercise-induced muscle damage

Chen, Hsin-Lian, Nosaka, Kazunori, Pearce, Alan J. and Chen, Trevor C. 2012, Two maximal isometric contractions attenuate the magnitude of eccentric exercise-induced muscle damage, Applied physiology, nutrition and metabolism, vol. 37, no. 4, pp. 680-689.

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Title Two maximal isometric contractions attenuate the magnitude of eccentric exercise-induced muscle damage
Author(s) Chen, Hsin-Lian
Nosaka, Kazunori
Pearce, Alan J.
Chen, Trevor C.
Journal name Applied physiology, nutrition and metabolism
Volume number 37
Issue number 4
Start page 680
End page 689
Total pages 10
Publisher NRC Research Press
Place of publication Ottawa, Canada
Publication date 2012-08
ISSN 1715-5312
Keyword(s) protective effect
muscle strength
delayed onset muscle soreness
creatine kinase
elbow flexors
lengthening contractions
Summary This study investigated whether maximal voluntary isometric contractions (MVC-ISO) would attenuate the magnitude of eccentric exercise-induced muscle damage. Young untrained men were placed into one of the two experimental groups or one control group (n = 13 per group). Subjects in the experimental groups performed either two or 10 MVC-ISO of the elbow flexors at a long muscle length (20° flexion) 2 days prior to 30 maximal isokinetic eccentric contractions of the elbow flexors. Subjects in the control group performed the eccentric contractions without MVC-ISO. No significant changes in maximal voluntary concentric contraction peak torque, peak torque angle, range of motion, upper arm circumference, plasma creatine kinase (CK) activity and myoglobin concentration, muscle soreness, and ultrasound echo intensity were evident after MVC-ISO. Changes in the variables following eccentric contractions were smaller (P < 0.05) for the 2 MVC-ISO group (e.g., peak torque loss at 5 days after exercise, 23% ± 3%; peak CK activity, 1964 ± 452 IU·L–1; peak muscle soreness, 46 ± 4 mm) or the 10 MVC-ISO group (13% ± 3%, 877 ± 198 IU·L–1, 30 ± 4 mm) compared with the control (34% ± 4%, 6192 ± 1747 IU·L–1, 66 ± 5 mm). The 10 MVC-ISO group showed smaller (P < 0.05) changes in all variables following eccentric contractions compared with the 2 MVC-ISO group. Therefore, two MVC-ISO conferred potent protective effects against muscle damage, whereas greater protective effect was induced by 10 MVC-ISO, which can be used as a strategy to minimize muscle damage.
Language eng
Field of Research 110903 Central Nervous System
Socio Economic Objective 920111 Nervous System and Disorders
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2012, NRC Research Press
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Document type: Journal Article
Collections: School of Psychology
School of Exercise and Nutrition Sciences
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