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Titolo:
Increases in intramuscular pressure raise arterial blood pressure during dynamic exercise
Autore:
Gallagher, KM; Fadel, PJ; Smith, SA; Norton, KH; Querry, RG; Olivencia-Yurvati, A; Raven, PB;
Indirizzi:
Univ N Texas, Hlth Sci Ctr, Dept Integrat Physiol, Ft Worth, TX 76107 USA Univ N Texas Ft Worth TX USA 76107 tegrat Physiol, Ft Worth, TX 76107 USA Univ N Texas, Hlth Sci Ctr, Cardiovasc Res Inst, Ft Worth, TX 76107 USA Univ N Texas Ft Worth TX USA 76107 ovasc Res Inst, Ft Worth, TX 76107 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 5, volume: 91, anno: 2001,
pagine: 2351 - 2358
SICI:
8750-7587(2001)91:5<2351:IIIPRA>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
CAROTID BAROREFLEX RESPONSIVENESS; BODY POSITIVE PRESSURE; CARDIOVASCULAR-RESPONSES; RESPIRATORY RESPONSES; GRADED REDUCTIONS; CENTRAL COMMAND; MUSCLE; HUMANS; COMPRESSION; PERFUSION;
Keywords:
mechanoreceptors; metaboreceptors; exercise pressor reflex;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
33
Recensione:
Indirizzi per estratti:
Indirizzo: Gallagher, KM Univ N Texas, Hlth Sci Ctr, Dept Integrat Physiol, 3500 CampBowie Blvd, Ft Worth, TX 76107 USA Univ N Texas 3500 Camp Bowie Blvd Ft Worth TX USA 76107 USA
Citazione:
K.M. Gallagher et al., "Increases in intramuscular pressure raise arterial blood pressure during dynamic exercise", J APP PHYSL, 91(5), 2001, pp. 2351-2358

Abstract

This investigation was designed to determine the role of intramuscular pressure-sensitive mechanoreceptors and chemically sensitive metaboreceptors in affecting the blood pressure response to dynamic exercise in humans. Sixteen subjects performed incremental (20 W/min) cycle exercise to fatigue under four conditions: control, exercise with thigh cuff occlusion of 90 Torr (Cuff occlusion), exercise with lower body positive pressure (LBPP) of 45 Torr, and a combination of thigh cuff occlusion and LBPP (combination). Indexes of central command (heart rate, oxygen uptake, ratings of perceived exertion, and electromyographic activity), cardiac output, stroke volume, and total peripheral resistance were not significantly different between the four conditions. Mechanical stimulation during LBPP and combination conditions resulted in significant elevations in intramuscular pressure and mean arterial pressure from control at rest and throughout the incremental exerciseprotocol (P< 0.05). Conversely, there existed no significant changes in mean arterial pressure when the metaboreflex was stimulated by cuff occlusion. These findings suggest that under normal conditions the mechanoreflex is tonically active and is the primary mediator of exercise pressor reflex-induced alterations in arterial blood pressure during submaximal dynamic exercise in humans.

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Documento generato il 27/11/20 alle ore 02:29:53