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Titolo:
SUMMATION OF ELEMENTARY PHONOMYOGRAMS DURING ISOMETRIC TWITCHES IN HUMANS
Autore:
PETITJEAN M; MATON B; FOURMENT A;
Indirizzi:
UNIV PARIS 13,PHYSIOL LAB,74 RUE MARCEL CACHIN F-93010 BOBIGNY FRANCE UNIV PARIS 11,ERS 102,CNRS,LAB PHYSIOL MOUVEMENT F-91405 ORSAY FRANCE
Titolo Testata:
European journal of applied physiology and occupational physiology
fascicolo: 6, volume: 77, anno: 1998,
pagine: 527 - 535
SICI:
0301-5548(1998)77:6<527:SOEPDI>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
HUMAN ADDUCTOR POLLICIS; MOTOR UNIT; SKELETAL-MUSCLE; ACOUSTIC MYOGRAPHY; VOLUNTARY; CONTRACTION; FATIGUE; SOUND; FORCE; RECRUITMENT;
Keywords:
ACOUSTIC MYOGRAPHY; ISOMETRIC CONTRACTION; MOTOR UNIT RECRUITMENT; MUSCLE TWITCH; PHONOMYOGRAM AND SURFACE MECHANOMYOGRAM;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
40
Recensione:
Indirizzi per estratti:
Citazione:
M. Petitjean et al., "SUMMATION OF ELEMENTARY PHONOMYOGRAMS DURING ISOMETRIC TWITCHES IN HUMANS", European journal of applied physiology and occupational physiology, 77(6), 1998, pp. 527-535

Abstract

To study its summation principle, the phonomyogram (PMG) from the first interosseus dorsalis muscle was recorded in five subjects during single twitches evoked by electrical stimulation over the motor point. By increasing the current pulse from threshold to maximal intensity, PMG amplitude increased linearly with motor unit recruitment. The twitchamplitude-intensity relationship was also linear. The PMG amplitude was therefore linearly related to the external force. For all these relationships highly significant correlation coefficients were found. These relationships were interpreted as being a consequence of an orderlyrecruitment, although, contrary to what happens during voluntary contraction, the largest and strongest motor units were recruited before the smallest and weakest ones during axon electrical stimulation. The PMG onset always preceded twitch onsets as indicated by latency measurements [mean 3.2 (SD 1.3) ms versus 11.5 (SD 3.9) ms, respectively]. Moreover, PMG and twitch latencies may have been significantly reduced by recruitment, suggesting that orderly recruitment influenced both PMGamplitude and occurrence. These results were interpreted as being theresult of the summation of elementary PMG from every contracting motor unit and the stiffness change of the muscle medium occurring with recruitment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 31/03/20 alle ore 05:01:12