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Titolo:
Discharge frequencies of single motor units in human diaphragm and parasternal muscles in lying and standing
Autore:
Butler, JE; McKenzie, DK; Gandevia, SC;
Indirizzi:
Prince Wales Med Res Inst, Sydney, NSW 2031, Australia Prince Wales Med Res Inst Sydney NSW Australia 2031 , NSW 2031, Australia Univ New S Wales, Sydney, NSW 2031, Australia Univ New S Wales Sydney NSWAustralia 2031 s, Sydney, NSW 2031, Australia
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1, volume: 90, anno: 2001,
pagine: 147 - 154
SICI:
8750-7587(200101)90:1<147:DFOSMU>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
BODY POSITION; LUNG-VOLUME; RIB CAGE; POSTURE; ELECTROMYOGRAPHY; PRESSURE; LENGTH; COMPENSATION; RECRUITMENT; STIMULATION;
Keywords:
inspiratory muscles; posture; motoneuron;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
49
Recensione:
Indirizzi per estratti:
Indirizzo: Gandevia, SC Prince Wales Med Res Inst, High St, Randwick, NSW 2031, Australia Prince Wales Med Res Inst High St Randwick NSW Australia 2031
Citazione:
J.E. Butler et al., "Discharge frequencies of single motor units in human diaphragm and parasternal muscles in lying and standing", J APP PHYSL, 90(1), 2001, pp. 147-154

Abstract

Single motor unit discharge was measured directly in diaphragm and parasternal intercostal muscles to determine whether neural drive to human inspiratory muscles changes between lying and standing. The final discharge frequency of diaphragmatic motor units increased slightly, by 1 Hz (12%; P < 0.01), when subjects were standing [182 units, median 9.1 Hz (interquartile range 7.6-11.3 Hz)] compared with lying supine [159 units, 8.1 Hz (6.6-10.3 Hz)]. However, this increase with standing occurred in only two of six subjects, in one of wham tidal volume increased significantly during standing. Parasternal intercostal motor unit final discharge frequencies did not differbetween standing [116 units, 8.0 Hz (6.6-9.6 Hz)] and lying [124 units, 8.4 Hz (7.0-10.3 Hz)]. The discharge frequencies at the onset of inspiration did not differ between lying and standing for either muscle. A larger proportion of motor units in both inspiratory muscles had postinspiratory or tonic expiratory activity for lying compared with standing (15 vs. 4%; P < 0.05). We conclude that there is no major difference in the phasic inspiratorydrive to the diaphragm with the change in posture.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/03/20 alle ore 22:09:27