Endurance training decreases the alkaline proteolytic activity in mouse skeletal muscles

  • A. Salminen
  • M. Kihlström
  • H. Kainulainen
  • T. Takala
  • V. Vihko


Alkaline and myofibrillar protease activities of rectus femoris, soleus, and tibialis anterior muscles and the pooled sample of gastrocnemius and plantaris muscles were analyzed in male NMRI-mice during a running-training program of 3, 10, or 20 daily 1-h sessions. The activity of citrate synthase increased during the endurance training, reflecting the increased oxidative capacity of skeletal muscles. The activities of alkaline and myofibrillar proteases continually decreased in the course of the training program in all muscles studied. Instead, the activity ofΒ-glucuronidase (a marker of lysosomal hydrolases) increased in all muscles. The highest activities were observed at the beginning of the training program. Present results, together with our earlier observations, show that the type of training, running as opposed to swimming, modulates the training responses in alkaline protease activities. Further, diverse adaptations in the activities of alkaline proteases and a lysosomal hydrolase suggest differences in the function of different proteolytic systems.

Key words

Endurance training Muscles Alkaline proteinases Mouse 


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Copyright information

© Springer-Verlag 1984

Authors and Affiliations

  • A. Salminen
    • 1
  • M. Kihlström
    • 1
  • H. Kainulainen
    • 1
  • T. Takala
    • 2
  • V. Vihko
    • 1
  1. 1.Division of Muscle Research, Department of Cell BiologyUniversity of JyvÄskylÄJyvÄskylÄ 10
  2. 2.Department of Clinical ChemistryUniversity of OuluOulu 22Finland

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