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Scand J Med Sci Sports. 2019 May;29(5):725-735. doi: 10.1111/sms.13388. Epub 2019 Feb 7.

Damage and the repeated bout effect of arm, leg, and trunk muscles induced by eccentric resistance exercises.

Author information

1
Department of Physical Education, National Taiwan Normal University, Taipei, Taiwan.
2
Department of Exercise and Health Sciences, University of Taipei, Taipei, Taiwan.
3
Department of Physical Education, Health and Recreation, National Chiayi University, Chiayi County, Taiwan.
4
Centre for Exercise and Sports Science Research, School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia, Australia.

Abstract

This study compared nine resistance eccentric exercises targeting arm, leg, and trunk muscles in one session for changes in maximal voluntary isometric contraction strength (MVC), delayed onset muscle soreness (DOMS), plasma creatine kinase (CK) activity, and myoglobin (Mb) concentration after the first and second bouts. Fifteen sedentary men (20-25 years) performed 5 sets of 10 eccentric contractions with 80% of MVC load for the elbow flexors (EF), elbow extensors (EE), pectoralis, knee extensors (KE), knee flexors (KF), plantar flexors (PF), latissimus, abdominis, and erector spinae (ES) in a randomized order and repeated the same exercises 2 weeks later. MVC decreased at 1 (16%-57%) to 4 (13%-49%) days, DOMS developed (peak: 43-70 mm), and CK activity (peak: 23 238-207 304 IU/L) and Mb concentration showed large increases after the first bout. The magnitude of decrease in MVC was greater (P < 0.05) for EF, EE, and PEC than others and for KF than KE, PF, and ES. DOMS was greater (P < 0.05) for EF, EE, and ES than others. Changes in all measures were smaller (P < 0.05) after the second than the first bout, and the magnitude of the repeated bout effect was similar among the muscles. Plasma CK activity and Mb concentration did not increase significantly after the second exercise bout. It was concluded that muscle damage was greater for arm than leg muscles, and muscle proteins in the blood increased to a critical level after unaccustomed whole-body resistance exercises, but the magnitude of damage was largely attenuated for all muscles similarly after the second bout.

KEYWORDS:

creatine kinase activity; delayed onset muscle soreness; maximal isometric contraction strength; protective effect; rhabdomyolysis

PMID:
30663816
DOI:
10.1111/sms.13388
[Indexed for MEDLINE]

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