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Muscle damage protective effect by two maximal isometric contractions on maximal eccentric exercise of the elbow flexors of the contralateral arm
Author(s) -
Chen T. C.,
Lin M. J.,
Chen H. L.,
Lai J. H.,
Yu H. I.,
Nosaka K.
Publication year - 2018
Publication title -
scandinavian journal of medicine and science in sports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.575
H-Index - 115
eISSN - 1600-0838
pISSN - 0905-7188
DOI - 10.1111/sms.13042
Subject(s) - isometric exercise , delayed onset muscle soreness , medicine , eccentric , creatine kinase , analysis of variance , concentric , muscle damage , elbow , muscle contraction , contraction (grammar) , cardiology , anatomy , mathematics , physics , geometry , quantum mechanics
Muscle damage after 30 maximal eccentric contractions of the elbow flexors (30 MVEC ) is reduced when the same exercise is performed by the opposite arm, and when two maximal voluntary isometric contractions at a long muscle length (2 MVIC ) are performed prior to 30 MVEC by the same arm. This study investigated the hypothesis that 2 MVIC would attenuate muscle damage after 30 MVEC performed by the opposite arm. Untrained young (20‐25 years) men were placed into 1 of 4 experimental groups that performed 2 MVIC at 1 (1d), 2 (2d), 4 (4d), or 7 days (7d) before 30 MVEC by the opposite arm, or one control group that performed 30 MVEC only (n = 13/group). Changes in indirect muscle damage markers after 30 MVEC were compared among the groups by mixed‐design two‐way ANOVA . Maximal voluntary concentric contraction torque, range of motion, plasma creatine kinase activity, and muscle soreness did not change significantly after 2 MVIC . Changes in these variables after 30 MVEC were smaller ( P < .05) for 1d (eg, peak soreness: 45 ± 21 mm) and 2d groups (46 ± 20 mm) than control group (66 ± 18 mm), without significant differences between 1d and 2d groups. No significant differences in the changes were found among 4d, 7d, and control groups, except for soreness showing smaller ( P < .05) increases for 4d group (54 ± 19 mm) than 7d (62 ± 17 mm) and control groups. These results supported the hypothesis and showed that muscle damage induced by 30 MVEC was reduced by 2 MVIC performed 1‐2 days prior to 30 MVIC by the contralateral arm.