Effect of thermal stress on the vestibulosympathetic reflexes in humans

Wilson, Thad E.; Ray, Chester A.

doi:10.1152/japplphysiol.00403.2004

Cited by 7 publications

(3 citation statements)

References 32 publications

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“…Slight increases in cerebral blood velocity during cold stress are observed, and these increases are maintained during heat-up tilt (15, 31). Alterations in orthostatic tolerance and cerebral blood flow due to thermal stress appear to be independent of the gain of other neural-induced postural reflexes (13, 33) but rather, in part, are related to previously alluded-to alterations in cardiac function and mechanics.…”

Section: Implication For Orthostatic Tolerancementioning

confidence: 96%

Effect of Thermal Stress on Cardiac Function

Wilson

Crandall

2011

Exercise and Sport Sciences Reviews

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104

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Whole-body heating decreases pulmonary capillary wedge pressure and cerebral vascular conductance, and causes an inotropic shift in the Frank-Starling curve. Whole-body cooling increases pulmonary capillary wedge pressure and cerebral vascular conductance without changing systolic function. These and other data indicate factors affecting cardiac function may mechanistically contribute to syncope during heat stress and improvements in orthostatic tolerance during cold stress.

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Section: Implication For Orthostatic Tolerancementioning

confidence: 96%

Effect of Thermal Stress on Cardiac Function

Wilson

Crandall

2011

Exercise and Sport Sciences Reviews

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104

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“…Their study showed that high thermal stress may affect the autonomic equilibrium of ruminant organisms by inducing the sympathetic nervous system nonlinearly. Wilson and Ray, [27] reported that whole-body heating raised heart rate, internal temperature, and muscle sympathetic nerve activity but mean arterial blood pressure was unaffected.…”

Section: Effect Of Thermal Stress On Autonomic Nervous Systemmentioning

confidence: 99%

Impacts of Environmental Stressors on Autonomic Nervous System

Adeniyi¹

2022

Autonomic Nervous System - Special Interest Topics

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Stress can be described as the perception of discomforts physically, psychologically, or physico-psychologically. During stress, the perceived discomfort indicates there is a deviation from homeostasis. In stress, there is a nonspecific physiological response to stressors, a group of stress-inducing phenomena. Stress-inducing phenomena can be defined as environmental insults, such as perturbed levels of light, temperature, chemicals, ambient oxygen, and noise. Response to stress occurs via the chemical messenger-mediated sympathetic nervous system including the autonomic-adrenal axis. Furthermore, the chemical messenger-mediated sympathetic nervous system determines nonhormonal effects which are often devised as general stress markers. Examples of general stress markers include changes in heart rate, heart rate variability, blood pressure, body temperature, blood glucose, baroreflex sensitivity, among others.

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“…For example, figure 1 shows the MSNA tracing of a subject and it can be appreciated that the waveform is mostly noisy and needs to be oriented on the background of the timing of R waves in order to provide meaningful interpretations. Several parameters have been used to quantify MSNA, namely the number of bursts per minute (burst frequency), the number of bursts per 100 heart beats (burst incidence), burst amplitude distribution, area under the bursts, arbitrary units and fractal dimension (Yamada et al 1989, Naughton et al 1998, Macefield et al 1999, Sverrisdottir et al 2000, Fadel et al 2004, Kimmerly et al 2004, Wilson and Ray 2004.…”

Section: Introductionmentioning

confidence: 99%

Arbitrary units are a composite and useful measure of muscle sympathetic nerve activity

Thakre¹,

Kulkarni²,

Mamtani³

et al. 2009

Physiol. Meas.

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In humans, the muscle sympathetic nerve activity (MSNA) signal is challenging to detect, record and analyze. Several methods exist that attempt to capture the latent construct of MSNA. We directly compared the performance of five MSNA parameters: burst frequency, burst incidence, median burst amplitude, arbitrary units (AU) and fractal dimension (FD). The MSNA signal was recorded in 33 subjects for approximately 30 min before, during and after the application of a graded cold pressor test stimulus at 18 degrees C, 10 degrees C and 2 degrees C in random order with an adequate wash-out period. Using coefficient of variation, Shannon's entropy and principal component analysis, we observed that these five parameters defined two physical and conceptual domains of MSNA-frequency and amplitude. Since AU combines information from both these domains, we observed that it explained maximum inter-subject and inter-experimental segment variation. FD did not explain the inter-subject variability and was identified as a unique parameter in the factor analysis. Epidemiological studies that attempt to quantify MSNA may consistently use AU as the parameter for quantification of MSNA.

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Effect of thermal stress on the vestibulosympathetic reflexes in humans

Abstract: Wilson, Thad E., and Chester A. Ray Effect of thermal stress on the vestibulosympathetic reflexes in humans.

Cited by 7 publications

References 32 publications

Effect of Thermal Stress on Cardiac Function

Effect of Thermal Stress on Cardiac Function

Impacts of Environmental Stressors on Autonomic Nervous System

Arbitrary units are a composite and useful measure of muscle sympathetic nerve activity

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