parasympathetic nervous system

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parasympathetic nervous system

n.
The part of the autonomic nervous system originating in the brainstem and the lower part of the spinal cord that, in general, inhibits or opposes the physiological effects of the sympathetic nervous system, as in tending to stimulate digestive secretions, slow the heart, constrict the pupils, and dilate blood vessels.

par·a·sym·pa·thet·ic nervous system

(păr′ə-sĭm′pə-thĕt′ĭk)
The part of the autonomic nervous system that tends to act in opposition to the sympathetic nervous system, as by slowing down the heart and dilating the blood vessels. It also regulates the function of many glands, such as those that produce tears and saliva.

parasympathetic nervous system

The part of the autonomic nervous system that controls rest and digestion.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.parasympathetic nervous system - originates in the brain stem and lower part of the spinal cord; opposes physiological effects of the sympathetic nervous system: stimulates digestive secretions; slows the heart; constricts the pupils; dilates blood vessels
nervous system, systema nervosum - the sensory and control apparatus consisting of a network of nerve cells
ANS, autonomic nervous system - the part of the nervous system of vertebrates that controls involuntary actions of the smooth muscles and heart and glands
Translations
parasympatická nervová soustava
parasympaattinen hermostoparasympatikus
References in periodicals archive ?
23] demonstrated increase in sympathetic tone and decrease in parasympathetic tone in females while male subjects demonstrated no significant change.
If the body's clock malfunctions, this affects the circadian rhythmicity in sympathetic and parasympathetic tone and in the cortisol awakening response, which in turn alter sympathetic reactivity to stress and the HPA-axis response.
Low parasympathetic tone is found in people with MDD, and studies have shown correlations between increased HRV and improved mood.
The ST-segment elevation and atrioventricular dissociation rhythm during the recovery phase suggest preexisting strong parasympathetic tone reactivation after strong sympathetic stimulation at peak exercise.
had a significant increase of parasympathetic tone with a sympathetic predominance before exercise; 2) according to subject's circadian typology, E-Types during morning training presented a significant parasympathetic withdrawal with a sympathetic predominance at REST and before (T0) HIIT compared to M-Types; this activation also remained in the 24 hours the cessation of the exercise; 3) During evening training both groups showed and higher predominance of the sympathetic tone (T0), but no significant differences between M-Types and E-Types were observed.
This finding indicates an increased contribution of parasympathetic tone to the heart autonomic function control when particulate exposure was reduced by the use of particulate-filtering respirators.
A likely explanation for the irregularity is that the P-P interval is prolonged by an increase in parasympathetic tone and a decrease in sympathetic tone resulting reflexly from stimulation of the carotid sinus by systolic ejection.
Spiegel and his colleagues measured high-frequency heart rate variability (HF-HRV), which appears to be the best measure of parasympathetic tone, has been associated with longer survival in humans and animals, and is related to immune system functioning.
It is therefore proposed that the cause of ECG abnormalities in association with lesions in the vicinity of area 13 on the orbital surface of the frontal lobe or around the circle of Willis results from alteration in sympathetic and parasympathetic tone mediated by fibres from the orbitofrontal area to the heart via the stellate ganglion.
Estrogen increases cholinergic activity at central and peripheral levels, which suppresses sympathetic tone and elevates parasympathetic tone.
The HF (baroreflex) component has been attributed to parasympathetic vagal modulation (respiratory sinus arithmetic component), whereas the LF component appears to be produced by baroreflex feedback, which is mainly modulated by sympathetic activities, although vagal parasympathetic tone may partially affect the LF component [3-5].

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