Effect of two maximal isometric contractions on eccentric exercise-induced muscle damage of the elbow flexors

Chen, Trevor C., Chen, Hsin-Lian, Lin, Ming-Ju, Chen, Che-Hsiu, Pearce, Alan J. and Nosaka, Kazunori 2013, Effect of two maximal isometric contractions on eccentric exercise-induced muscle damage of the elbow flexors, European journal of applied physiology, vol. 113, no. 6, pp. 1545-1554, doi: 10.1007/s00421-012-2581-8.

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Title Effect of two maximal isometric contractions on eccentric exercise-induced muscle damage of the elbow flexors
Author(s) Chen, Trevor C.
Chen, Hsin-Lian
Lin, Ming-Ju
Chen, Che-Hsiu
Pearce, Alan J.
Nosaka, Kazunori
Journal name European journal of applied physiology
Volume number 113
Issue number 6
Start page 1545
End page 1554
Total pages 10
Publisher Springer
Place of publication Berlin, Germany
Publication date 2013-06
ISSN 1439-6327
Keyword(s) Creatine Kinase
Isometric Contraction
Muscle Strength
Muscle, Skeletal
Musculoskeletal Pain
Range of Motion, Articular
Young Adult
Science & Technology
Life Sciences & Biomedicine
Sport Sciences
Repeated bout effect
Delayed onset muscle soreness
Summary This study investigated the time wise protective effect conferred by two maximal voluntary isometric contractions (2MVCs) at 20° elbow flexion on muscle damage induced by 30 maximal isokinetic (60° s(-1)) eccentric contractions of the elbow flexors (MaxECC). Sixty-five young untrained men were randomly assigned to a control group that did not perform 2MVCs, or one of four experimental groups (n = 13 per group) who performed 2MVCs either immediately (0d), 2 (2d), 4 (4d) or 7 days (7d) before MaxECC. Changes in maximal isokinetic (60° s(-1)) concentric torque (MVC-CON), optimum angle (OA), range of motion, upper arm circumference, muscle soreness, plasma creatine kinase activity and myoglobin concentration, and ultrasound echo-intensity following MaxECC were compared among the groups by a two-way repeated measures ANOVA. No significant changes in any variables were evident following 2MVCs. The 2d and 4d groups showed 16-62 % smaller (P < 0.05) changes in all variables following MaxECC than the control, 0d and 7d groups. The 2d group showed 14-34 % smaller (P < 0.05) changes in all variables except for OA compared with the 4d group. The changes in the variables were similar among the control, 0d and 7d groups. These results show that 2MVCs that were performed between 2 and 4 days before MaxECC attenuated the magnitude of muscle damage, but no such effect was evident if the 2MVCs were performed immediately or 7 days before MaxECC. It is concluded that the protective effect conferred by 2MVCs is relatively short-lived, and there is a window for the effect to be conferred.
Language eng
DOI 10.1007/s00421-012-2581-8
Field of Research 170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology)
1106 Human Movement And Sports Science
Socio Economic Objective 920499 Public Health (excl. Specific Population Health) not elsewhere classified
HERDC Research category C1.1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2013, Springer-Verlag Berlin Heidelberg
Persistent URL http://hdl.handle.net/10536/DRO/DU:30067248

Document type: Journal Article
Collections: Faculty of Health
School of Psychology
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