Frequency and amplitude analysis of the EMG during exercise on the bicycle ergometer View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1979-03

AUTHORS

J. S. Petrofsky

ABSTRACT

The surface EMG was recorded from above the quadriceps muscle in 3 male subjects during bicycle ergometry at work loads between 20 and 100% of the VO2 max to measure the EMG amplitude (RMS) and frequency (assessed from the center frequency of the power spectra) during this type of work. During brief (3 min) bouts of work the RMS amplitude of the EMG was linearly related to the work load; the center frequency of the EMG power spectra was the same at all work loads examined. In contrast, during sustained bouts of work maintained for 80 min at 20 and 40% of the VO2 max, the RMS amplitude of the EMG remained constant while the center frequency initially increased for the first 20 min of work and then progressively decreased as the work continued. When work loads of 60, 80, and 100% of the VO2 max were sustained to fatigue, the RMS amplitude continually increased while the EMG frequency decreased from the beginning to the end of the work periods.The results of this study showed that the EMG is a complex waveform, being influenced not only by fatigue, but to even a larger extent in many cases, the temperature of the exercising muscles. Therefore, although musclar fatigue caused an increase in the RMS amplitude and decrease in the center frequency, the increase in muscle temperature associated with the work opposed these changes by causing a reduction in the RMS amplitude and an increase in the center frequency. More... »

PAGES

1-15

References to SciGraph publications

  • 1977-06. Signal characteristics of EMG during fatigue in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1975-12. The assessment of the static component in rhythmic exercise in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1976-03. Isometric strength and endurance during the menstrual cycle in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1971. Muscle ATP, CP, and Lactate in Submaximal and Maximal Exercise in MUSCLE METABOLISM DURING EXERCISE
  • 1974-12. Einfluß von lokaler Erwärmung auf die elektrische und thermische Leitfähigkeit der Haut und das Oberflächen-EMG in EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
  • 1912. Elektrophysiologie menschlicher Muskeln in NONE
  • Identifiers

    URI

    http://scigraph.springernature.com/pub.10.1007/bf00424464

    DOI

    http://dx.doi.org/10.1007/bf00424464

    DIMENSIONS

    https://app.dimensions.ai/details/publication/pub.1053319817

    PUBMED

    https://www.ncbi.nlm.nih.gov/pubmed/446467


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