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Wolverhampton Intellectual Repository and E-Theses > School of Health & Wellbeing > Centre for Health and Social Care Improvement > The influence of small fibre muscle mechanoreceptors on the cardiac vagus in humans.

Please use this identifier to cite or link to this item: http://hdl.handle.net/2436/15856
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Title: The influence of small fibre muscle mechanoreceptors on the cardiac vagus in humans.
Authors: Gladwell, V.F.
Fletcher, Janine
Patel, N.
Elvidge, L.J.
Lloyd, D.
Chowdhary, Saqib
Coote, John H.
Citation: Journal of Physiology, 567(2): 713-721
Publisher: The Physiological Society / Wiley InterScience
Issue Date: 2005
URI: http://hdl.handle.net/2436/15856
DOI: 10.1113/jphysiol.2005.089243
PubMed ID: 15946971
Additional Links: http://jp.physoc.org/cgi/content/abstract/567/2/713
http://www3.interscience.wiley.com/journal/118736169/abstract
http://www.ingentaconnect.com/content/bsc/tjp/2005/00000567/00000002/art00030
Abstract: We have previously shown that activation of muscle receptors by passive stretch (PS) increases heart rate (HR) with little change in blood pressure (BP). We proposed that PS selectively inhibits cardiac vagal activity. We attempted to test this by performing PS during experimental alterations in vagal tone. Large decreases in vagal tone were induced using either glycopyrrolate or mild rhythmic exercise. Milder alterations in vagal tone were achieved by altering carotid baroreceptor input: neck pressure (NP) or neck suction (NS). PS of the triceps surae was tested in 14 healthy human volunteers. BP, ECG and respiration were recorded. PS alone caused a significant decrease (P < 0.05) in R-R interval (962 +/- 76 ms at baseline compared to 846 +/- 151 ms with PS), and showed a reduction in HR variability, which was not significant. The decrease in R-R interval with PS was significantly less (P < 0.05, n = 3) following administration of glycopyrrolate (-8.1 +/- 4.5 ms) compared to PS alone (-54 +/- 11 ms), and also with PS during handgrip (+10 +/- 10 ms) compared with PS alone (-74 +/- 15 ms) (P < 0.05, n = 5). Milder reductions in vagal activity (NP) resulted in a small but insignificant further decrease in R-R interval in response to PS (-107 +/- 17 ms compared to PS alone -96 +/- 13 ms, n = 5). Mild increases in vagal activity (NS) during PS resulted in smaller decreases in R-R interval (-39 +/- 5.5 ms) compared to PS alone (-86 +/- 17 ms) (P < 0.05, n = 8). BP was not significantly changed by stretch in any tests. The results indicate that amongst muscle receptors there is a specific group activated by stretch that selectively inhibit cardiac vagal tone to produce tachycardia.
Type: Article
Language: en
Description: Metadata only
Keywords: Muscle receptors
Cardiac vagus
Humans
Vagal tone
Cardiac vagal activity
Small fibre muscle mechanoreceptors
ISSN: 0022-3751
Appears in Collections: Centre for Health and Social Care Improvement

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