EMG median power frequency in an exhausting exercise

Wim Ament*, Gerard J.J. Bonga, At L. Hof, Gijsbertus J. Verkerke

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

37 Citations (Scopus)
200 Downloads (Pure)


EMG median power frequency of the calf muscles was investigated during an exhausting treadmill exercise. This exercise was an uphill run, the average endurance time was 1.5 min. Median power frequency of the calf muscles declined by more than 10% during this exercise. In addition EMG median power frequency of isometric contractions of the same muscles was measured before and in one minute intervals for 10 min after this run. Immediately after the run isometric median power frequency had declined by less than 5% for the soleus muscle, more than 10% for the gastrocnemius medialis and gastrocnemius lateralis muscles. In the 10 min following exercise the isometric median power frequency increased to pre-execise levels. Maybe the median power frequency shift to lower frequencies during dynamic exercise can be interpreted as a sign of local muscle fatigue.

Original languageEnglish
Pages (from-to)214-220
Number of pages7
JournalJournal of electromyography and kinesiology
Issue number4
Publication statusPublished - 1993
Externally publishedYes


  • Dynamic contractions
  • Isometric contractions
  • Median power frequency
  • Muscle fatigue


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