Interaction of Cardiovascular Reflexes in Circulatory Control

Abboud, François M.; Thames, Marc D.

doi:10.1002/cphy.cp020319

Cited by 126 publications

(73 citation statements)

References 510 publications

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“…To assist their decisions (which were made independently), we informed judges of earlier evidence relating cardiovascular responses to somatomotor and respiratory action under nonfeedback conditions (. Abboud & Thames, 1983;Sharpey-Schafer, 1963), However, judges had no knowledge of the subject's measured performance or of the assignment of the blood pressure responses to A and B trials. If judges discerned an alternative basis on which to assign the verbal reports, they were invited to use it.…”

Section: Analysis Of Verbal Reportsmentioning

confidence: 99%

Modulation of Slow Cortical Potentials by Instrumentally Learned Blood Pressure Responses

et al. 1992

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We assessed whether instrumentally-learned pressor responses inhibit electrocortical activity, a. <« predicted by learning theories of idiopathie hypertension. Subjects received beat-by-beat feedback for increases and decreases in mean arterial pressure measured from the finger (PeHkr method). Slow potentials were recorded from the midsaiiittal line during the final traininK session. Also recorded at tbis time were heart rate, eye movements, respiration, and post-session verbal reports of the subject's control strategies. Thirteen of 14 subjects differentiated blood pressure increases and decreases at p<.OS or better during the final session (within-subject discriminative operant procedure). Slow potentials were less negative on blood pressure increase compared to decrease trials at all midsagittal sites (p< .02), indicating relative cortical inhibition by pressor responses. I his effect occurred even though subjects reported tensing of muscles on increase trials (/><.O1), a behavioral activity previously associated with augmented rather than diminished cortical negativity. On increase trials slow potentials shifted toward positivity just prior to heart rate deceleration (the latter eflect eonfimiing activation of the baroreceptors).

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Section: Analysis Of Verbal Reportsmentioning

confidence: 99%

Modulation of Slow Cortical Potentials by Instrumentally Learned Blood Pressure Responses

et al. 1992

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“…If an oscillating system has a clear (although possibly fluctuating) dominant frequency and a sufficiently narrow band spectrum the concept of an instantaneous frequency and an instantaneous phase 1 (IP) can be well defined [38], i.e. the signal ξ(t) can be represented as…”

Section: Instantaneous Phasementioning

confidence: 99%

“…the CBS has manifold feedback loops. The complex anatomical and functional organization of the RF has already been described in detail as well as interconnections with other brain areas (1,17,31,34,35,39). Some of the important interrelationships of the CBS neurons in the RF are given in the scheme of Fig.…”

Section: Introductionmentioning

confidence: 98%

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Nonstationary time-series analysis applied to investigation of brainstem system dynamics

Vandenhouten

Lambertz²,

Langhorst³

et al. 2000

IEEE Trans. Biomed. Eng.

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-Previous investigations of the dynamic organization of the lower brainstem and its relation to peripheral and other central nervous sub-systems were predominantly performed by linear methods. These are based on time-averaging algorithms, which merely can be applied to stationary signal intervals. Thus the current concept of the common brainstem system (CBS) in the reticular formation (RF) of the lower brainstem and basic types of its functional organization have been developed. Here we present experiments where neuronal activities of the RF and the nucleus tractus solitarii (NTS, first relay station of baroreceptor afferents) were recorded together with related parameters of EEG, respiration, and cardiovascular system. The RF neurons are part of the CBS, which participates in regulation and coordination of cardiovascular, respiratory, and motor systems, and vigilance. The physiological time series thus acquired yield information about the internal dynamic coordination of the participating regulation processes. The major problem in evaluating these data is the non-linearity and instationarity of the signals. We used a set of especially designed time resolving methods to evaluate non-linear dynamic couplings in the interaction between CBS neurons and cardiovascular signals, respiration and the EEG, and between NTS neurons (influenced by baroreceptor afferents) and CBS neurons.

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“…The nervous system -acting through the autonomic nervous system (ANS)-coordinates the fine-tuning of cardiorespiratory interplay, to maintain an appropriate oxygen delivery to the tissues (Abboud & Thames, 1983;Eyzaguirre et al, 1983). Autonomic (sympatheticparasympathetic) balance is maintained by several reflex arcs, like arterial baroreflexes (Kirchheim, 1976), central chemoreflexes, peripheral arterial chemoreflexes, and pulmonary stretch reflexes (Liljestrand, 1958).…”

Section: Introductionmentioning

confidence: 99%