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

Min Jyue Huang, Kazunori Nosaka, Ho Seng Wang, Kuo Wei Tseng, Hsin Lian Chen, Tai Ying Chou, Trevor C. Chen

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

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 < 0.05). Increases in plasma CK activity and myoglobin concentration were smaller for Experimental (e.g., peak CK: 2763 ± 3459 IU/L) than Control group (120,360 ± 50,158 IU/L). Conclusions: These results showed that 10% EC was effective for attenuating the magnitude of muscle damage after 80% EC for all muscles, although the magnitude of the protective effect differed among the muscles.

Original languageEnglish
Pages (from-to)1055-1064
Number of pages10
JournalEuropean Journal of Applied Physiology
Volume119
Issue number5
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • Creatine kinase
  • Delayed-onset muscle soreness
  • Lengthening contraction
  • Maximal isometric contraction strength
  • Rhabdomyolysis

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Public Health, Environmental and Occupational Health
  • Physiology (medical)

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