Electromyogram median power frequency in dynamic exercise at medium exercise intensities

W Ament*, GJJ Bonga, AL Hof, GJ Verkerke

*Bijbehorende auteur voor dit werk

Onderzoeksoutput: ArticleAcademicpeer review

35 Citaten (Scopus)


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.

Originele taal-2English
Pagina's (van-tot)180-186
Aantal pagina's7
TijdschriftEuropean journal of applied physiology and occupational physiology
Nummer van het tijdschrift1-2
StatusPublished - aug.-1996

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