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Titolo:
RELATION BETWEEN THE SIZE OF MOTOR UNITS AND THE SPECTRAL CHARACTERISTICS OF THEIR ACTION-POTENTIALS
Autore:
SEKI K; NARUSAWA M;
Indirizzi:
UNIV WASHINGTON,DEPT PHYSIOL & BIOPHYS,BOX 357330 SEATTLE WA 98195 INT BUDO UNIV,DEPT EXERCISE PHYSIOL CHIBA 29952 JAPAN
Titolo Testata:
ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
fascicolo: 5, volume: 109, anno: 1998,
pagine: 436 - 443
SICI:
0924-980X(1998)109:5<436:RBTSOM>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIBER CONDUCTION-VELOCITY; POWER SPECTRUM; SURFACE ELECTROMYOGRAM; ISOMETRIC CONTRACTIONS; RECRUITMENT THRESHOLD; MUSCLE; FREQUENCY; SYNCHRONIZATION; FORCE;
Keywords:
SIZE PRINCIPLE; SPIKE TRIGGER AVERAGING; MAXIMAL TWITCH TENSION; SURFACE EMGS; FIRST DORSAL INTEROSSEOUS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
29
Recensione:
Indirizzi per estratti:
Citazione:
K. Seki e M. Narusawa, "RELATION BETWEEN THE SIZE OF MOTOR UNITS AND THE SPECTRAL CHARACTERISTICS OF THEIR ACTION-POTENTIALS", ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY, 109(5), 1998, pp. 436-443

Abstract

Objective: The purpose of this study was to clarify the influence of the size of an individual motor unit on the spectral characteristics of its motor unit action potentials (MUAPs). Methods: In 4 human subjects, we first averaged the isometric force and the surface EMC signals triggered by the intramuscularly recorded action potentials of each motor unit during voluntary isometric contraction. Then, we obtained averaged twitch contraction curves, averaged MUAPs derived from surface EMG signals (S-MUAPs), and the power spectrum of the S-MUAPs. Finally, we tested for correlations among these results in each subject. Results: There was a positive correlation among the mean power frequency of the S-MUAPs, the maximal amplitude of the S-MUAPs, and the maximal twitch tension of their motor unit in each subject (r = 0.58-0.85; P < 0.05). Conclusions: Since the twitch tension and the amplitude of the S-MUAPs are well-known predictors of the size of motor units, we conclude that the spectral characteristics of the S-MUAPs reflect the size ofthe motor unit from which they originate. (C) 1998 Elsevier Science Ireland Ltd. All rights reserved.

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Documento generato il 02/12/20 alle ore 04:36:05