Regenerated soleus muscle shows reduced creatine kinase efflux after contractile activity in vitro

Juozas Baltusnikas, Audrius Kilikevicius, Tomas Venckunas, Andrej Fokin, Arimantas Lionikas, Aivaras Ratkevicius

Research output: Contribution to journalArticle

2 Citations (Scopus)
6 Downloads (Pure)

Abstract

Regenerated skeletal muscles show less muscle damage after strenuous muscle exercise. The aim of the studies was to investigate if the regeneration is associated with reduced muscle creatine kinase (CK) efflux immediately after the exercise. Cryolesion was applied to the soleus muscle of 3-month-old C57BL/6J male mice. Then total CK efflux was assessed in vitro in the regenerated muscles without exercise or after 100 eccentric contractions. The same measurements were performed in the control muscles, which were not exposed to cryolesion. Regenerated muscles generated weaker (P < 0.05) twitches, but stronger (P < 0.05) 150-Hz and 300-Hz tetani with prolonged (P < 0.01) contraction times compared with the control muscles. There was no difference between regenerated and control muscles in the total CK efflux without exercise, but only control muscles showed an increase (P < 0.001) in the CK efflux after the exercise. Our results suggest that muscle regeneration is associated with modulation of contractile properties and improvement in muscle resistance to damage after eccentric exercise.

Original languageEnglish
Pages (from-to)129-133
Number of pages5
JournalApplied Physiology Nutrition and Metabolism / Physiologie Appliquée, Nutrition et Métabolisme
Volume40
Issue number2
Early online date15 Oct 2014
DOIs
Publication statusPublished - Feb 2015

Keywords

  • cryolesion
  • primary damage
  • muscle damage
  • repeated bout effect
  • eccentric exercise
  • lengthening contractions
  • mice

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