Damage protective effects conferred by low-intensity eccentric contractions on arm, leg and trunk muscles

Purpose Low-intensity eccentric contractions with a load corresponding to 10% of maximal voluntary isometric contraction strength (10% EC) attenuate muscle damage in a subsequent bout of higher-intensity eccentric contractions performed within 2 weeks for the elbow flexors, knee flexors and knee ext...

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Bibliographic Details
Published in:European journal of applied physiology 2019-05, Vol.119 (5), p.1055-1064
Main Authors: Huang, Min-Jyue, Nosaka, Kazunori, Wang, Ho-Seng, Tseng, Kuo-Wei, Chen, Hsin-Lian, Chou, Tai-Ying, Chen, Trevor C.
Format: Article
Language:English
Subjects:
Arm
Biomedical and Life Sciences
Biomedicine
Contraction
Creatine
Creatine kinase
Elbow
Exercise
Health sciences
Human Physiology
Knee
Muscle contraction
Myoglobins
Occupational Medicine/Industrial Medicine
Original Article
Physical education
Physical fitness
Physiology
Rhabdomyolysis
Sports Medicine
Variance analysis
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Summary:Purpose Low-intensity eccentric contractions with a load corresponding to 10% of maximal voluntary isometric contraction strength (10% EC) attenuate muscle damage in a subsequent bout of higher-intensity eccentric contractions performed within 2 weeks for the elbow flexors, knee flexors and knee extensors. However, it is not known whether this strategy could be applied to other muscles. This study investigated whether 10% EC would confer damage protective effect on high-intensity eccentric contractions (80% EC) for nine different muscle groups. Methods Untrained young men were placed to an experimental or a control group ( n  = 12/group). Experimental group performed 50 eccentric contractions with a load corresponding to 10% EC at 2 days prior to 50 eccentric contractions with 80% EC for the elbow flexors and extensors, pectoralis, knee flexors and extensors, plantar flexors, latissimus, abdominis and erector spinae. Control group performed 80% EC without 10% EC. Changes in maximal voluntary isometric contraction strength (MVC) and muscle soreness, plasma creatine kinase (CK) activity and myoglobin concentration after 80% EC were compared between groups by a mixed-factor ANOVA. Results MVC recovered faster (e.g., 6–31% greater MVC at 5 days post-exercise), and peak muscle soreness was 36–54% lower for Experimental than Control group for the nine muscles ( P  
ISSN:1439-6319
1439-6327
DOI:10.1007/s00421-019-04095-9