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Titolo:
Muscle chemoreflex elevates muscle blood flow and O-2 uptake at exercise onset in nonischemic human forearm
Autore:
Perrey, S; Tschakovsky, ME; Hughson, RL;
Indirizzi:
Univ Waterloo, Dept Kinesiol, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 ol, Waterloo, ON N2L 3G1, Canada Lab Sci Sport, F-25030 Besancon, France Lab Sci Sport Besancon France F-25030 ci Sport, F-25030 Besancon, France Queens Univ, Sch Phys & Hlth Educ, Kingston, ON K7L 3N6, Canada Queens Univ Kingston ON Canada K7L 3N6 Educ, Kingston, ON K7L 3N6, Canada Queens Univ, Dept Physiol, Kingston, ON K7L 3N6, Canada Queens Univ Kingston ON Canada K7L 3N6 siol, Kingston, ON K7L 3N6, Canada
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 5, volume: 91, anno: 2001,
pagine: 2010 - 2016
SICI:
8750-7587(2001)91:5<2010:MCEMBF>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
SKELETAL-MUSCLE; OXYGEN-UPTAKE; INTRACELLULAR PO-2; UPTAKE KINETICS; CARDIAC-OUTPUT; ENERGETICS; PULMONARY; HYPOXIA; DYNAMICS; VO2;
Keywords:
blood pressure; Doppler velocimetry; handgrip exercise; metabolic control; ischemia;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Hughson, RL Univ Waterloo, Dept Kinesiol, Waterloo, ON N2L 3G1, Canada Univ Waterloo Waterloo ON Canada N2L 3G1 , ON N2L 3G1, Canada
Citazione:
S. Perrey et al., "Muscle chemoreflex elevates muscle blood flow and O-2 uptake at exercise onset in nonischemic human forearm", J APP PHYSL, 91(5), 2001, pp. 2010-2016

Abstract

We tested the hypothesis that increases in forearm blood flow (FBF) duringthe adaptive phase at the onset of moderate exercise would allow a more rapid increase in muscle O-2 uptake ((V) over dot O-2mus). Fifteen subjects completed forearm exercise in control (Con) and leg occlusion (Occ) conditions. In Occ, exercise of ischemic calf muscles was performed before the onset of forearm exercise to activate the muscle chemoreflex evoking a 25-mmHg increase in mean arterial pressure that was sustained during forearm exercise. Eight subjects who increased FBF during Occ compared with Con in the adaptation phase by >30 ml/min were considered "responders. " For the responders, a higher (V) over dot O-2 mus accompanied the higher FBF only during the adaptive phase of the Occ tests, whereas there was no difference in the baseline or steady-state FBF or (V) over dot O-2 mus between Occ and Con. Supplying more blood flow at the onset of exercise allowed a more rapid increase in (V) over dot O-2 mus supporting our hypothesis that, at least for this type of exercise, O-2 supply might be limiting.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 09:50:21