3 edition of Carotid baroreflex function and cardiovascular response to isometric exercise found in the catalog.
Carotid baroreflex function and cardiovascular response to isometric exercise
Written in English
|Statement||by Douglas R. Seals.|
|The Physical Object|
|Pagination||viii, 128 leaves|
|Number of Pages||128|
During dynamic exercise, mechanisms controlling the cardiovascular apparatus operate to provide adequate oxygen to fulfill metabolic demand of exercising muscles and to guarantee metabolic end-products washout. Moreover, arterial blood pressure is regulated to maintain adequate perfusion of the vital organs without excessive pressure variations. Baroreflex Heart Rate Regulation Spontaneous baroreflex sensitivity was calculated as the slope of the linear regression line between systolic blood pressures and subse-quent RR intervals (within the same or the next heart beat) using the sequence technique,17 Sequences with 3 intervals, mm Hg -5 0 5 10 15 Time [secs] EKG ABP MSNA.
Lack of effect of isometric handgrip exercise on the responses of the carotid sinus baroreceptor reflex in man. Ludbrook J, Faris IB, Iannos J, Jamieson GG, Russell WJ. Clin Sci Mol Med, 55(2), 01 Aug Cited by 22 articles | PMID: We sought to examine the importance of the cardiac component of the carotid baroreflex (CBR) in control of blood pressure during isometric exercise. Nine subjects performed 4 min of ischaemic isometric calf exercise at 20% of maximum voluntary contraction.
Heart rate increased from 71 to beats/min indicating activation of the baroreflex control mechanism. Neurally mediated changes in the cardiovascular responses to an increase in carotid baroceptor activity and to dynamic exercise were not affected by the drug, nor was the renin-aldosterone system. Influence of age on cardiac baroreflex function during dynamic exercise in humans, American Journal of Physiology (Consolidated), , HH Carrington CA, Fisher JP, Davies MK & White MJ. () Muscle afferent inputs to cardiovascular control during isometric exercise vary with muscle group in patients with chronic heart failure.
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We sought to examine the importance of the cardiac component of the carotid baroreflex (CBR) in control of blood pressure during isometric exercise. Nine subjects performed 4 min of ischaemic isometric calf exercise at 20% of maximum voluntary by: Get this from a library.
Carotid baroreflex function and cardiovascular response to isometric exercise in endurance trained athletes and borderline hypertensives.
[Douglas R Seals]. The carotid baroreceptors were stimulated by neck suction of 30 seconds'. duration, and equal stimuli were applied at rest and during hand-grip exercise performed at 40% of the sub.
jects' maximal strength. Baroreceptor stimulation at rest increased R-R interval and reduced blood pressure. exercise [ ]. Accordingly, attenuated baseline baroreflex sensitivity may further affect the magnitude of blood pressure responses to exercise in hypertensive patients.
To clarify the potential role of altered baro- receptor reflex in blood pressure regulation we measured resting carotid baroreflex functionFile Size: KB.
Carotid-cardiac baroreflex function is restored in subjects after bedrest with application of maximal exercise 24 hours prior to reambulation (Engelke et al., ). Carotid baroreflex (CBR) function curves were modelled from the heart rate (HR) and mean arterial pressure (MAP) responses to rapid changes in neck pressure and suction during steady state static by: Present results suggest that VVS patients present an abnormal regulation of cardiovascular responses to IHG, with preserved cardiovagal and cardiac sympathetic function.
The finding of abnormal BP response to isometric exercise may help to characterize a subgroup of VVS patients without benefit of isometric maneuver to abort syncope.
Abstract. To study the relative importance of cardiac and peripheral effector mechanisms in the carotid sinus baroreflex in man cardiovascular responses to equal changes of the carotid sinus transmural pressure (Ptm) in either direction of the normal were recorded and compared in eight physically well-trained young male volunteers.
stimulated by passive muscle stretch, which causes cardiovascular responses. However, the influence of passive stretch-induced muscle mechanoreflex stimulation on the baroreflex is unknown.
Therefore, this thesis investigated the effects of muscle mechanoreflex stimulation via passive calf muscle stretch on baroreflex function in humans. Acute modulation of BP changes in response to physiological challenges, such as exercise, are regulated by BRS and other mechanisms to balance sympathetic and parasympathetic tone.
8 Stretch-sensitive (baro-) receptors within the carotid artery and aortic arch trigger reflex cardiovascular responses to modify cardiac contractility, heart rate.
Abstract During heavy exercise, the arterial baroreflex and the reflexes evoked by the activation of those afferent nerve endings in the working skeletal muscles that are sensitive to metabolic changes (the so-called muscle metaboreflex) are hypothesized to be activated and, moreover, to interact in ways that lead to the modulation of the primary cardiovascular reflex responses.
Integration of Cardiovascular Control Systems in Dynamic Exercise. Supplement Handbook of Physiology, Exercise: Regulation and Integration of Multiple Systems Does the Pressor Response to Voluntary Isometric Contraction have Chemoreflex or Mechanoreflex Origin.
Characterization and Analysis of Arterial Baroreflex Function Baroreflex. Although arterial baroreflexes modify cardiovascular responses from voluntary muscle activations and muscle afferents, data on arterial baroreflex sensitivity and other baroreflex response characteristics during isometric arm contraction are sparse and incomplete (4, 15).
We attempted to elucidate the separate effects of voluntary motor activation and muscle ischemia on arterial baroreflexes by determining complete sets of baroreflex response parameters during sudden alterations of carotid. These experiments showed that during dynamic exercise the baroreflex function curves were shifted upwards and to the right, thus allowing the baroreflex to continue to be operational but over a higher range of arterial pressure, corresponding to the increased arterial pressure during exercise (Papelier et al., ; Potts, ).
The magnitude. Carotid baroreflex (CBR) function curves were modelled from the heart rate (HR) and mean arterial pressure (MAP) responses to rapid changes in neck pressure and suction during steady state static. The data indicate that isometric handgrip exercise has a specific influence on human carotid baroreflex control of arterial pressure and heart period: baroreflex function curves are shifted rightward during handgrip, whereas baroreflex sensitivity is unchanged.
Furthermore, central neural influences may be partially involved in these alterations. We sought to examine the influence of exercise intensity on carotid baroreflex (CBR) control of heart rate (HR) and mean arterial pressure (MAP) at the onset of exercise in humans.
To accomplish this, eight subjects performed multiple 1-min bouts of isometric handgrip (HG) exercise at 15, 30, 45 and 60% maximal voluntary contraction (MVC), while breathing to a metronome set at eupneic frequency.
Muscle afferent and central command contributions to the cardiovascular response to isometric exercise of postural muscle in patients with mild chronic heart failure. Muscle afferent inputs to cardiovascular control during isometric exercise vary with muscle group in patients with chronic heart failure.
With the use of the variable pressure neck collar and the fitting of response data to a logistic function curve, the resetting of the carotid baroreflex control of heart rate (HR), blood pressure, and sympathetic nerve activity during exercise has been shown to occur with a. The aim of this study was to demonstrate that within a population of healthy men (n = 15) of varying levels of aerobic fitness, (i) there are high and low responders with respect to carotid–cardiac baroreflex responsiveness, despite similar baseline heart rates (HRs) both at rest and during dynamic exercise, and (ii) there is a weak association between this responsiveness and training.
During heavy exercise, the arterial baroreflex and the reflexes evoked by the activation of those afferent nerve endings in the working skeletal muscles that are sensitive to metabolic changes (the so-called muscle metaboreflex) are hypothesized to be activated and, moreover, to interact in ways that lead to the modulation of the primary cardiovascular reflex responses.Staessen J, Fiocchi R, Fagard R, Hespel P, Amery A () Progressive attenuation of the carotid baroreflex control of blood pressure and heart rate during exercise.
Am Heart J – PubMed CrossRef Google Scholar.The introduction of the variable pressure neck collar (Ernsting & Perry, ) and its subsequent mechanical modification (Eckberg et al. ) and customized computer‐controlled operation (Pawelczyk & Raven, ) provided the ability to obtain stimulus–response logistic function curves of the carotid baroreflex (CBR) control of HR and mean arterial pressure (MAP) in humans at rest and during exercise.