Electromyogram median power frequency in dynamic exercise at medium exercise intensities

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

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

36 Citations (Scopus)
19 Downloads (Pure)


The electromyogram (EMG) median power Frequency of the calf muscles was investigated during an exhausting treadmill exercise and a 20-min recovery period. The exercise was an uphill run at a speed of 5 km . h(-1) and a gradient of 20%. During exercise there was no decrease of EMG median power frequency. Tn contrast, EMG median power frequency in isometric contractions of the same muscles decreased by 7% for the soleus muscle and 16 to 18% for gastrocnemius muscles immediately after the exercise, During the recovery period the isometric median power Frequency of the gastrocnemius muscles increased to pre-exercise levels in about 5 min. The isometric median power frequency of the soleus muscle also increased but had not reached pre-exercise values by 20 min. The observations from this study and from a previous uphill treadmill investigation at a steeper gradient ga-cre evidence that two types of exhaustion can be distinguished during dynamic exercise; exhaustion at lower exercise intensities without a decrease in frequency during exercise and exhaustion at high intensities accompanied by a decline of frequency. The reason for this difference remains unclear.

Original languageEnglish
Pages (from-to)180-186
Number of pages7
JournalEuropean Journal of Applied Physiology and Occupational Physiology
Issue number1-2
Publication statusPublished - Aug 1996
Externally publishedYes


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


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