Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Interaction between vestibulosympathetic and skeletal muscle reflexes on sympathetic activity in humans
Autore:
Ray, CA;
Indirizzi:
Penn State Univ, Milton S Hershey Med Ctr, Coll Med, Dept Med,Div Cardiol H047, Hershey, PA 17033 USA Penn State Univ Hershey PA USA 17033 Cardiol H047, Hershey, PA 17033 USA Penn State Univ, Coll Med, Dept Cellular & Mol Physiol, Gen Clin,Res Ctr, Hershey, PA 17033 USA Penn State Univ Hershey PA USA 17033 Clin,Res Ctr, Hershey, PA 17033 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1, volume: 90, anno: 2001,
pagine: 242 - 247
SICI:
8750-7587(200101)90:1<242:IBVASM>2.0.ZU;2-C
Fonte:
ISI
Lingua:
ENG
Soggetto:
VENTROLATERAL MEDULLARY NEURONS; NATURAL VESTIBULAR STIMULATION; MUSCULAR-CONTRACTION; BRAIN-STEM; ARTERIAL-PRESSURE; NERVE RESPONSES; LEG EXERCISE; AGE; WEIGHTLESSNESS; MECHANISMS;
Keywords:
autonomic nervous system; exercise; muscle sympathetic nerve activity; muscle afferents; neural control; otolith organs;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Ray, CA Penn State Univ, Milton S Hershey Med Ctr, Coll Med, Dept Med,Div Cardiol H047, 500 Univ Dr, Hershey, PA 17033 USA Penn State Univ 500 Univ Dr Hershey PA USA 17033 hey, PA 17033 USA
Citazione:
C.A. Ray, "Interaction between vestibulosympathetic and skeletal muscle reflexes on sympathetic activity in humans", J APP PHYSL, 90(1), 2001, pp. 242-247

Abstract

Evidence from animals indicates that skeletal muscle afferents activate the vestibular nuclei and that both vestibular and skeletal muscle afferents have inputs to the ventrolateral medulla. The purpose of the present study was to investigate the interaction between the vestibulosympathetic and skeletal muscle reflexes on muscle sympathetic nerve activity (MSNA) and arterial pressure in humans. MSNA, arterial pressure, and heart rate were measured in 17 healthy subjects in the prone position during three experimental trials. The three trials were 2 min of 1) head-down rotation (HDR) to engagethe vestibulosympathetic reflex, 2) isometric handgrip (IHG) at 30% maximal voluntary contraction to activate skeletal muscle afferents, and 3) HDR and IHG performed simultaneously. The order of the three trials was randomized. HDR and IHG performed alone increased total MSNA by 46 +/- 16 and 77 +/- 24 units, respectively (P < 0.01). During the HDR plus IHG trial, MSNA increased 142 +/- 38 units (P < 0.01). This increase was not significantly different from the sum of the individual trials (130 +/- 41 units). This finding was also observed with mean arterial pressure (sum = 21 +/- 2 mmHg and HDR + IHG = 22 +/- 2 mmHg). These findings suggest that there is an additive interaction for MSNA and arterial pressure when the vestibulosympathetic and skeletal muscle reflexes are engaged simultaneously in humans. Therefore, no central modulation exists between these two reflexes with regard to MSNA output in humans.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/04/20 alle ore 18:04:46