| Cardiovascular autonomic control during short-term thermoneutral and cool head-out immersion. | |
| | |
MedLine Citation:
|
PMID: 18225773 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
BACKGROUND: Moderately cold head-out water immersion stimulates both baro- and cold-receptors, and triggers complex and contradictory effects on the cardiovascular system and its autonomic nervous control. OBJECTIVES: To assess the effects of water immersion and cold on cardiovascular status and related autonomic nervous activity. METHODS: Hemodynamic variables and indexes of autonomic nervous activity (analysis of heart rate and blood pressure variability) were evaluated in 12 healthy subjects during 3 exposures of 20 min each in the upright position, i.e., in air (AIR, 24-25 degrees C), and during head-out water immersion at 35-36 degrees C (WIn) and 26-27 degrees C (WIc). RESULTS: Plasma noradrenaline, systolic and diastolic blood pressure, and total peripheral resistances were reduced during WIn compared to AIR (263.9 +/- 39.4 vs. 492.5 +/- 35.7 pg x ml(-1), 116.5 +/- 3.7 and 65.4 +/- 1.7 mmHg vs. 140.8 +/- 4.7 and 89.8 +/- 2.8 mmHg, 14.1 +/- 1.0 vs. 16.3 +/- 0.9 mmHg x L(-1) x min, respectively) while they were increased during WIc (530.8 +/- 84.7 pg ml(-1), 148.0 +/- 7.0 mmHg, 80.8 +/- 3.0 mmHg, and 25.8 +/- 1.9 mmHg x L(-1) x min, respectively). The blood pressure variability was reduced to the same extent during WIc and Win compared to AIR. Heart rate decreased during WIn (67.8 +/- 2.7 vs. 81.2 +/- 2.7 bpm during AIR), in parallel with an increased cardiac parasympathetic activity. This pattern was strengthened during WIc (55.3 +/- 2.2 bpm). CONCLUSIONS: Thermoneutral WI lowered sympathetic activity and arterial tone, while moderate whole-body skin cooling triggered vascular sympathetic activation. Conversely, both WI and cold triggered cardiac parasympathetic activation, highlighting a complex autonomic control of the cardiovascular system. |
| | |
Authors:
|
Laurent Mourot; Malika Bouhaddi; Emmanuel Gandelin; Sylvie Cappelle; Gilles Dumoulin; Jean-Pierre Wolf; Jean Denis Rouillon; Jacques Regnard |
Related Documents
:
|
443393 - Low-frequency viscoelastic properties of canine femoral artery in vivo. 15095083 - Cardiovascular autonomic function in patients with hemodynamic instability at induction... 22967853 - Efficacy of temporary positive expiratory pressure (tpep) in patients with lung disease... |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Aviation, space, and environmental medicine Volume: 79 ISSN: 0095-6562 ISO Abbreviation: Aviat Space Environ Med Publication Date: 2008 Jan |
Date Detail:
|
Created Date: 2008-01-29 Completed Date: 2008-03-06 Revised Date: 2008-11-21 |
Medline Journal Info:
|
Nlm Unique ID: 7501714 Medline TA: Aviat Space Environ Med Country: United States |
Other Details:
|
Languages: eng Pagination: 14-20 Citation Subset: IM; S |
Affiliation:
|
Université de Franche Comté, Physiologie, Faculté de Médecine, Besançon, France. mourotlaurent@hotmail.com |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Adult Analysis of Variance Arginine Vasopressin / blood Atrial Natriuretic Factor / blood Autonomic Nervous System / metabolism, physiology* Body Temperature Cardiography, Impedance Cardiovascular Physiological Phenomena* Cardiovascular System / innervation Catecholamines / blood Cold Temperature* Hemodynamics / physiology Humans Immersion* Male Posture / physiology Spectrum Analysis Water |
| Chemical | |
Reg. No./Substance:
|
0/Catecholamines; 113-79-1/Arginine Vasopressin; 7732-18-5/Water; 85637-73-6/Atrial Natriuretic Factor |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Pharmacological interventions to decompression sickness in rats: comparison of five agents.
Next Document: Simulation of cumulative risk of developing altitude decompression sickness.