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Titolo:
Synchronization of single motor units during voluntary contractions in theupper and lower extremities
Autore:
Kim, MS; Masakado, Y; Tomita, Y; Chino, N; Pae, YS; Lee, K;
Indirizzi:
Keio Univ, Sch Med, Dept Rehabil Med, Shinjuku Ku, Tokyo 1608582, Japan Keio Univ Tokyo Japan 1608582 bil Med, Shinjuku Ku, Tokyo 1608582, Japan Ewha Womans Univ, Sch Med, Dept Pharmacol, Seoul, South Korea Ewha Womans Univ Seoul South Korea , Dept Pharmacol, Seoul, South Korea
Titolo Testata:
CLINICAL NEUROPHYSIOLOGY
fascicolo: 7, volume: 112, anno: 2001,
pagine: 1243 - 1249
SICI:
1388-2457(200107)112:7<1243:SOSMUD>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORTICOSPINAL PROJECTIONS; LIMB MOTONEURONS; MUSCLES; DISCHARGES; CORTEX; TASK;
Keywords:
motor unit synchronization; cross-correlation analysis; coherence analysis; upper extremity muscles; lower extremity muscles; human subjects;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
21
Recensione:
Indirizzi per estratti:
Indirizzo: Masakado, Y Keio Univ, Sch Med, Dept Rehabil Med, Shinjuku Ku, 35 Shinanomachi, Tokyo 1608582, Japan Keio Univ 35 Shinanomachi Tokyo Japan 1608582 1608582, Japan
Citazione:
M.S. Kim et al., "Synchronization of single motor units during voluntary contractions in theupper and lower extremities", CLIN NEU, 112(7), 2001, pp. 1243-1249

Abstract

Objective: To investigate motor unit synchronization in the time and frequency domains and compare the amount and nature of this synchronization between upper and lower extremity muscles in human subjects. Methods: A total of 120 motor unit pairs from biceps brachii (BB), first dorsal interosseous (1DI), vastus medialis (VM), and tibialis anterior (TA) on the dominant side were analyzed and compared. Pairs of motor unit spike trains were recorded from two concentric needle electrodes inserted within these muscles in healthy volunteers. Subjects were instructed to maintain aweak isometric contraction of these muscles so that an individual motor unit recorded from each concentric needle discharged at a steady rate of approximately 10 impulses/s. Pairs of motor unit spike trains were cross-correlated in the time domain, and coherence analysis in the frequency domain wasperformed on the same spike train data. Results: Synchronization was seen in all the muscles studied. Strength of motor unit synchronization, expressed as synchronization index (SI), was greater in 1DI muscles compared to other muscles (P < 0.01). Coherence analysis revealed significant association between motor unit firings in the 1-5 and 25-30 Nz frequency ranges in all the muscles studied. The incidence of 25-30 Hz coherence peaks were found to be greater fur 1DI muscles compared to other muscles. Conclusion: The above results suggest a possible role for corticospinal projections in producing pre-synaptic inputs responsible for synchronization of motor unit firings and 25-30 Hz coherence peaks. (C) 2001 Elsevier Science Ireland Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/07/20 alle ore 05:56:55