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Titolo:
EFFECTS OF PREMOTION SILENT PERIOD ON SINGLE MOTOR UNIT FIRING AT INITIATION OF A RAPID CONTRACTION
Autore:
TSUKAHARA R; AOKI H; YABE K; MANO T;
Indirizzi:
AICHI HUMAN SERV CTR,INST DEV RES KAKUGAI AICHI 48003 JAPAN NAGOYA UNIV,HLTH PHYS FITNESS & SPORTS RES CTR NAGOYA AICHI 46401 JAPAN NAGOYA UNIV,ENVIRONM MED RES INST NAGOYA AICHI 46401 JAPAN
Titolo Testata:
ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY
fascicolo: 5, volume: 97, anno: 1995,
pagine: 223 - 230
SICI:
0924-980X(1995)97:5<223:EOPSPO>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
VOLUNTARY MOVEMENT; BALLISTIC CONTRACTIONS; MAGNETIC STIMULATION; HUMAN MUSCLES; EXCITABILITY; FACILITATION; RECRUITMENT; NEURONS; CORTEX; FORCE;
Keywords:
SINGLE MOTOR UNIT; PREMOTION SILENT PERIOD; VOLUNTARY CONTRACTION; (HUMAN);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
R. Tsukahara et al., "EFFECTS OF PREMOTION SILENT PERIOD ON SINGLE MOTOR UNIT FIRING AT INITIATION OF A RAPID CONTRACTION", ELECTROMYOGRAPHY AND MOTOR CONTROL-ELECTROENCEPHALOGRAPHY AND CLINICAL NEUROPHYSIOLOGY, 97(5), 1995, pp. 223-230

Abstract

We compared the single motor unit (SMU) activity between movements with a premotion silent period (PMSP) and without PMSP in EMG. Fourteen SMUs in the gastrocnemius muscle and 6 SMUs in the soleus muscle were recorded from 5 volunteers during isometric plantar flexion. Tonicallyfiring SMUs failed to fire just before the onset of a rapid contraction with PMSP more frequently than without PMSP. SMUs tended to fire within 10 msec (the gastrocnemius SMUs) or 20 msec (the soleus SMUs) from the onset of the phasic EMG discharge when PMSP occurred. In a rapidcontraction without PMSP, the initial firing of SMUs occurred with longer latency than that in a rapid contraction with PMSP. The latency of the initial SMU firing in a rapid contraction related to the preceding time of the last SMU firing during a sustained contraction to the onset of the phasic EMG discharge. When the preceding firing was long enough, the latency distributed around 10 msec. On the other hand, for shorter preceding times,the latency lengthened with shortening of the preceding time. It is suggested that the PMSP makes the preceding timelong and increases the susceptibility of motor units to the descending command at the initiation of a rapid contraction.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/09/20 alle ore 20:21:27