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Titolo:
MOTOR UNIT FIRING BEHAVIOR IN SLOW AND FAST CONTRACTIONS OF THE FIRSTDORSAL INTEROSSEOUS MUSCLE OF HEALTHY-MEN
Autore:
MASAKADO Y; AKABOSHI K; NAGATA M; KIMURA A; CHINO N;
Indirizzi:
KEIO UNIV,SCH MED,DEPT REHABIL MED,SHINJUKU KU TOKYO 160 JAPAN
Titolo Testata:
ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
fascicolo: 6, volume: 97, anno: 1995,
pagine: 290 - 295
SICI:
0924-980X(1995)97:6<290:MUFBIS>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
VOLUNTARY CONTRACTIONS; EMG SIGNAL; RECRUITMENT; DECOMPOSITION;
Keywords:
FAST CONTRACTION; MOTOR UNIT; RECRUITMENT THRESHOLD; FIRING RATE; DECOMPOSITION TECHNIQUE; SIZE PRINCIPLE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
16
Recensione:
Indirizzi per estratti:
Citazione:
Y. Masakado et al., "MOTOR UNIT FIRING BEHAVIOR IN SLOW AND FAST CONTRACTIONS OF THE FIRSTDORSAL INTEROSSEOUS MUSCLE OF HEALTHY-MEN", ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY, 97(6), 1995, pp. 290-295

Abstract

The motor unit recruitment threshold and firing rate were evaluated during slow and fast contraction of the first dorsal interosseous (FDI)muscle by healthy young men. Using a special quadrifilar electrode myoelectric activity was recorded during voluntary isometric contraction. Motor unit action potentials (MUAPs) were decomposed into individualMUAP trains by the electromyography (EMG) signal decomposition technique. Recruitment thresholds of the motor units decreased with the increase in the speed of contraction, and there was no recruitment reversal despite the increase. In terms of rate coding, the firing rates of the motor units increased as the speed of contraction increased; however, a high threshold motor unit always had a lower firing rate than a low threshold motor unit regardless of the contraction speed. At all contraction speeds, recruitment and rate coding may act through the samemechanism. If excitation of the motoneuron pool occurs rather than excitation of an individual motoneuron, a low threshold motor unit is easier to recruit and fire repetitively than a high threshold one. The motor unit firing behavior during fast contraction basically may be thesame as during slow contraction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 04:57:44