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Titolo:
The muscle sound properties of different muscle fiber types during voluntary and electrically induced contractions
Autore:
Yoshitake, Y; Moritani, T;
Indirizzi:
Kyoto Univ, Grad Sch Human & Environm Studies, Appl Physiol Lab, Kyoto 606, Kyoto Univ Kyoto Japan 606 nvironm Studies, Appl Physiol Lab, Kyoto 606,
Titolo Testata:
JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
fascicolo: 3, volume: 9, anno: 1999,
pagine: 209 - 217
SICI:
1050-6411(199906)9:3<209:TMSPOD>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
MOTOR UNIT TWITCHES; CAT SOLEUS MUSCLE; ISOMETRIC CONTRACTION; SURFACE MECHANOMYOGRAM; ADDUCTOR POLLICIS; MUSCULAR SOUND; FIRING RATE; FORCE; GASTROCNEMIUS; PHONOMYOGRAM;
Keywords:
soundmyogram; surface EMG; motor units; electrical stimulation;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Moritani, T Kyoto Univ, Grad Sch Human & Environm Studies, Appl Physiol Lab, Kyoto 606, Kyoto Univ Kyoto Japan 606 ies, Appl Physiol Lab, Kyoto 606,
Citazione:
Y. Yoshitake e T. Moritani, "The muscle sound properties of different muscle fiber types during voluntary and electrically induced contractions", J ELECTROMY, 9(3), 1999, pp. 209-217

Abstract

Soundmyogram (SMG) and electromyogram signals were recorded simultaneouslyfrom the relatively fast medial gastrocnemius (MG) and slow soleus (SOL) during voluntary and electrically induced contractions. Using a spike-triggered averaging technique, the averaged elementary sound and corresponding MUspikes were also obtained from about 35 different MUs identified. The rms-SMG of MG increased as a function of force (P < 0.01). On the contrary, these values for SOL increased up to 60% MVC (P < 0.01), but decreased at 80% MVC. The relationship between the peak to peak amplitude of SMG and MU spike indicated significant positive correlations (r = 0.631 similar to 0.657, P < 0.01). During electrical stimulation at 5 Hz, the SMG power spectral peak frequency (PF) was matched with stimulation frequency in both muscles. At higher stimulation frequencies, e.g., > 15 Hz, only in the MG was SMG-PF synchronized with stimulation frequency; the slow SOL did not show such synchronization. Our data suggest that the SMG frequency components might reflect active motor unit firing rates, and that the SMG amplitude depends uponmechanical properties of contraction, muscle fiber composition, and firingrate during voluntary and electrically induced contractions. (C) 1999 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 08/04/20 alle ore 09:02:31