1988
DOI: 10.1007/bf00583741
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The use of isometric exercise as a means of evaluating the parasympathetic contribution to the tachycardia induced by dynamic exercise in normal man

Abstract: Fourteen normal subjects were submitted to isometric exercise (IE), dynamic exercise (DE) and a combination of the two (IE + DE). The main purpose of the present study was to use IE as a means of evaluating the mechanism of the heart rate (HR) increase induced by DE. To this end, the magnitude of the IE (handgrip) was standardized so as to cause an elevation of HR almost exclusively by vagal withdrawal: IE was performed using a dynamometer strain-gauge system with a linear response at 75% of maximum voluntary … Show more

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Cited by 13 publications
(10 citation statements)
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“…The HR response to the VM is mainly influenced by cardiac autonomic control, which is responsible for the rapid increase phase, with vagal withdrawal over the sinus node, as well as for the reduction after cessation of the VM, with vagal tone activation. These adjustments may occur in response to the activation of cardiopulmonary receptors and arterial baroreceptors 17,19,37,38…”
Section: Discussionmentioning
confidence: 99%
“…The HR response to the VM is mainly influenced by cardiac autonomic control, which is responsible for the rapid increase phase, with vagal withdrawal over the sinus node, as well as for the reduction after cessation of the VM, with vagal tone activation. These adjustments may occur in response to the activation of cardiopulmonary receptors and arterial baroreceptors 17,19,37,38…”
Section: Discussionmentioning
confidence: 99%
“…The central mechanism activates neuronal pathways from central nervous system to modify the activities of sympathetic and parasympathetic systems, consequently determining some cardiovascular responses 1 . In addition, evidences from electromyography records show that the activation of more motor units of muscle fibers recruited during a contraction is related to the neural mechanism of central command, which determines immediate changes in the level of efferent activity from SNS and PNS, acting on heart, and of SNS, acting on blood vessels 17,18 . Poliana H. Leite, Ruth C. Melo, Marcelo F. Mello, Ester da Silva, Audrey Borghi-Silva, Aparecida M. Catai Moreover, the reflex neural mechanism, related to mechanical and metabolic activities from the muscle in contraction, also determines the level of autonomic activity on cardiovascular system.…”
Section: Discussionmentioning
confidence: 99%
“…Quanto à posição corporal, não observamos diferenças significativas nos valores de VFC entre as posições supina e sentada, tanto para as voluntárias jovens, como para as PMCRH. Outros estudos também não observaram alterações nos índices temporais de VFC com a mudança postural (MARÃES, 1999;RIBEIRO, 2001;RIBEIRO et al, 2001a;SILVA et al, 2001 (ROBINSON et al, 1966;NORDENFELT, 1971;MACIEL et al, 1986;GALLO Jr et al, 1988;SEALS & VÍCTOR, 1991;NÓBREGA & ARAÚJO, 1993).…”
Section: Análise Daunclassified
“…Na análise no domínio do tempo, a FC instantânea e os intervalos R-R são determinados e posteriormente analisados por meio de cálculos repouso, manobras autonômicas e durante exercício físico (GROSSMAN et al, 1991;AHMED et al, 1994;MUKAI & HAYANO, 1995;BARBOSA et al, 1996;YAMASAKI et al, 1996;ALONSO et al, 1998;MARÃES et al, 2000a;2000b;MASSIN et al, 2000;RIBEIRO et al, 2000;2001a;ROSÁRIO et al, 2000;SILVA et al, 2001;CATAI et al, 2002 (SATO et al, 1980;MACIEL et al, 1986;GALLO Jr et al, 1988;MITCHELL, 1990).…”
Section: Introductionunclassified
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