Title

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

Document Type

Journal Article

Publication Title

Scandinavian Journal of Medicine & Science in Sports

ISSN

1600-0838

Volume

29

Issue

5

First Page

725

Last Page

735

PubMed ID

30663816

Publisher

John Wiley & Sons Ltd

School

Centre for Exercise and Sports Science Research / School of Medical and Health Sciences

Funders

Funding information available at https://doi.org/10.1111/sms.13388

Comments

Originally published as: Chen, T. C., Yang, T.-J., Huang, M.-J., Wang, H.-S., Tseng, K.-W., Chen, H.-L., & Nosaka, K. (2019). Damage and the repeated bout effect of arm, leg, and trunk muscles induced by eccentric resistance exercises. Scandinavian Journal of Medicine & Science in Sports, 29(5), 725–735. Original publication available here

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.

DOI

10.1111/sms.13388

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