Vibromyographic recording from human muscles with known fibre composition differences
Deutscher übersetzter Titel: | Vibromyographische Befunde von menschlichen Skelettmuskeln mit bekannter Fasertypverteilung |
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Autor: | Mealing, D.; Long, G.; McCarthy, P.W. |
Erschienen in: | British journal of sports medicine |
Veröffentlicht: | 30 (1996), 1, S. 27-31, Lit. |
Format: | Literatur (SPOLIT) |
Publikationstyp: | Zeitschriftenartikel |
Medienart: | Gedruckte Ressource |
Sprache: | Englisch |
ISSN: | 0306-3674, 1473-0480 |
Schlagworte: | |
Online Zugang: | |
Erfassungsnummer: | PU199611201142 |
Quelle: | BISp |
Abstract des Autors
Objective: To determine the relation between the vibromyographic (VMG) frequency characteristics and fibre composition in postural and non-postural human muscle undergoing a standardised voluntary contraction. Methods: Two human muscles with different fibre compositions (soleus: postural, mainly type I (slow) fibres; biceps brachii: non-postural, mixed type I and II (fast) fibres) were recorded from 18 healthy males isometrically contracting at 50% of their maximum voluntary contraction (MVC). Muscle vibrations were recorded using a contact microphone and the frequency content of the signals calculated using fast fourier transform algorithms. Results: The non-postural biceps brachii showed predominantly bimodal power spectra with significantly increased power in the 10-30 Hz bands (P<0.01), as compared with soleus recordings which tended to be unimodal, with the majority of power below 10 Hz. Conclusions: Muscles with a large proportion of type I fibres generate VMG signals which contain an increased percentage of low frequencies as compared to muscles with a mixed population of type I and type II fibres. The VMG appears to be generated, in part at least, by the mechanical twitching of motor units within the muscle; frequency domain analysis of this signal may provide a non-invasive measure of muscle fibre composition. Verf.-Referat