Journal of Applied Physiology Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 55: 392-399, 1983;
8750-7587/83 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Kranz, H.
Right arrow Articles by Silberstein, R. B.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Kranz, H.
Right arrow Articles by Silberstein, R. B.

Journal of Applied Physiology, Vol 55, Issue 2 392-399, Copyright © 1983 by American Physiological Society

ARTICLES

Factors determining the frequency content of the electromyogram

H. Kranz, A. M. Williams, J. Cassell, D. J. Caddy and R. B. Silberstein

The contribution of central and peripheral factors to the frequency content of the electromyogram was examined in 10 subjects performing maximal 45-s contractions of thenar muscles. The median frequencies (Fm) of surface-recorded electromyograms and compound action potentials were similar early (P greater than 0.6) and late (P greater than 0.5) in the contractions. There was a mean decrease in the Fm during contraction of 39% for electromyograms and 35% for compound potentials (P greater than 0.1). The Fm of electromyograms increased 11% (P less than 0.02) in only the 1st s of contraction as force was raised from 25 to 100% of maximum. Only one of five subjects showed evidence of increasing synchronization of motor unit discharge during contraction. There was no evidence that delay or dispersion of action potential propagation in terminal nerve fibers or at the neuromuscular junction had a significant effect on frequency content. The findings indicated that the spectral content of muscle electrical activity, and its shift during contraction, primarily reflects intrinsic muscle properties.


This article has been cited by other articles:


Home page
 Exp PhysiolHome page
V. Shushakov, C. Stubbe, A. Peuckert, V. Endeward, and N. Maassen
Human, Environmental & Exercise: The relationships between plasma potassium, muscle excitability and fatigue during voluntary exercise in humans
Exp Physiol, July 1, 2007; 92(4): 705 - 715.
[Abstract] [Full Text] [PDF]

Home page
 Br. J. Sports. Med.Home page
J P Weir, T W Beck, J T Cramer, T J Housh, T D Noakes, A St Clair Gibson, and E V Lambert
Is fatigue all in your head? A critical review of the central governor model * Commentary.
Br. J. Sports Med., July 1, 2006; 40(7): 573 - 586.
[Abstract] [Full Text] [PDF]

Home page
 Physiol. Rev.Home page
S. C. Gandevia
Spinal and Supraspinal Factors in Human Muscle Fatigue
Physiol Rev, October 1, 2001; 81(4): 1725 - 1789.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
F. Borrani, R. Candau, G. Y. Millet, S. Perrey, J. Fuchslocher, and J. D. Rouillon
Is the {V}O2 slow component dependent on progressive recruitment of fast-twitch fibers in trained runners?
J Appl Physiol, June 1, 2001; 90(6): 2212 - 2220.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online