Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans
Identifieur interne : 001820 ( Istex/Corpus ); précédent : 001819; suivant : 001821Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans
Auteurs : Lars Schwabe ; Gabor Szinnai ; Ulrich Keller ; Hartmut SchachingerSource :
- Clinical Physiology and Functional Imaging [ 1475-0961 ] ; 2007-09.
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Abstract
Enhanced hydration increases the human cardiovascular reactivity to mental stress. If reduced water intake has the opposite effect, this would suggest controlling for water deprivation when studying such responses. Blood pressure, heart rate and parasympathetically dominated beat‐to‐beat heart rate fluctuations were assessed during resting baseline and mental stress. Two challenging cognitive‐motor tasks, a 5‐Choice Reaction Time Task (CRTT) and a Paced Auditory Serial Addition Task (PASAT), served as mental stress tests. Eight female and eight male volunteers were examined twice, after 24 h of water deprivation and after normal water intake (counterbalanced order, 7‐day interval). Water deprivation resulted in moderate dehydration with a mean 2·6% decrease of total body weight. Dehydration did neither affect baseline blood pressure, heart rate, nor blood pressure reactivity to mental stress. However, dehydration slightly (−1·2 bpm) diminished heart rate reactivity to the PASAT (P = 0·03) and increased beat‐to‐beat heart rate fluctuations in response to the CRTT (P = 0·05). Dehydration intensified CRTT‐ and PASAT‐induced reductions of beat‐to‐beat heart rate fluctuations in females (gender × dehydration interactions: P = 0·04–0·05). Moderate dehydration induced by water restriction has no effect on blood pressure reactivity to mental stress. The effects on heart rate reactivity are small. However, stress‐induced parasympathetic withdrawal may be fortified during dehydration in females, which suggests controlling for water intake when studying such responses.
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DOI: 10.1111/j.1475-097X.2007.00750.x
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans</title><author><name sortKey="Schwabe, Lars" sort="Schwabe, Lars" uniqKey="Schwabe L" first="Lars" last="Schwabe">Lars Schwabe</name><affiliation><mods:affiliation>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</mods:affiliation></affiliation></author><author><name sortKey="Szinnai, Gabor" sort="Szinnai, Gabor" uniqKey="Szinnai G" first="Gabor" last="Szinnai">Gabor Szinnai</name><affiliation><mods:affiliation>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</mods:affiliation></affiliation></author><author><name sortKey="Keller, Ulrich" sort="Keller, Ulrich" uniqKey="Keller U" first="Ulrich" last="Keller">Ulrich Keller</name><affiliation><mods:affiliation>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</mods:affiliation></affiliation></author><author><name sortKey="Schachinger, Hartmut" sort="Schachinger, Hartmut" uniqKey="Schachinger H" first="Hartmut" last="Schachinger">Hartmut Schachinger</name><affiliation><mods:affiliation>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:B42470A7EF062D37C1C2C88AFC4C431DCD30A40E</idno><date when="2007" year="2007">2007</date><idno type="doi">10.1111/j.1475-097X.2007.00750.x</idno><idno type="url">https://api.istex.fr/document/B42470A7EF062D37C1C2C88AFC4C431DCD30A40E/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001820</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001820</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans</title><author><name sortKey="Schwabe, Lars" sort="Schwabe, Lars" uniqKey="Schwabe L" first="Lars" last="Schwabe">Lars Schwabe</name><affiliation><mods:affiliation>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</mods:affiliation></affiliation></author><author><name sortKey="Szinnai, Gabor" sort="Szinnai, Gabor" uniqKey="Szinnai G" first="Gabor" last="Szinnai">Gabor Szinnai</name><affiliation><mods:affiliation>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</mods:affiliation></affiliation></author><author><name sortKey="Keller, Ulrich" sort="Keller, Ulrich" uniqKey="Keller U" first="Ulrich" last="Keller">Ulrich Keller</name><affiliation><mods:affiliation>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</mods:affiliation></affiliation></author><author><name sortKey="Schachinger, Hartmut" sort="Schachinger, Hartmut" uniqKey="Schachinger H" first="Hartmut" last="Schachinger">Hartmut Schachinger</name><affiliation><mods:affiliation>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Clinical Physiology and Functional Imaging</title><idno type="ISSN">1475-0961</idno><idno type="eISSN">1475-097X</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2007-09">2007-09</date><biblScope unit="volume">27</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="291">291</biblScope><biblScope unit="page" to="297">297</biblScope></imprint><idno type="ISSN">1475-0961</idno></series><idno type="istex">B42470A7EF062D37C1C2C88AFC4C431DCD30A40E</idno><idno type="DOI">10.1111/j.1475-097X.2007.00750.x</idno><idno type="ArticleID">CPF750</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1475-0961</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Paced Auditory Serial Addition Task</term><term>cardiovascular stress reactivity</term><term>dehydration</term><term>reaction time</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Enhanced hydration increases the human cardiovascular reactivity to mental stress. If reduced water intake has the opposite effect, this would suggest controlling for water deprivation when studying such responses. Blood pressure, heart rate and parasympathetically dominated beat‐to‐beat heart rate fluctuations were assessed during resting baseline and mental stress. Two challenging cognitive‐motor tasks, a 5‐Choice Reaction Time Task (CRTT) and a Paced Auditory Serial Addition Task (PASAT), served as mental stress tests. Eight female and eight male volunteers were examined twice, after 24 h of water deprivation and after normal water intake (counterbalanced order, 7‐day interval). Water deprivation resulted in moderate dehydration with a mean 2·6% decrease of total body weight. Dehydration did neither affect baseline blood pressure, heart rate, nor blood pressure reactivity to mental stress. However, dehydration slightly (−1·2 bpm) diminished heart rate reactivity to the PASAT (P = 0·03) and increased beat‐to‐beat heart rate fluctuations in response to the CRTT (P = 0·05). Dehydration intensified CRTT‐ and PASAT‐induced reductions of beat‐to‐beat heart rate fluctuations in females (gender × dehydration interactions: P = 0·04–0·05). Moderate dehydration induced by water restriction has no effect on blood pressure reactivity to mental stress. The effects on heart rate reactivity are small. However, stress‐induced parasympathetic withdrawal may be fortified during dehydration in females, which suggests controlling for water intake when studying such responses.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Lars Schwabe</name><affiliations><json:string>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</json:string></affiliations></json:item><json:item><name>Gabor Szinnai</name><affiliations><json:string>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</json:string></affiliations></json:item><json:item><name>Ulrich Keller</name><affiliations><json:string>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</json:string></affiliations></json:item><json:item><name>Hartmut Schachinger</name><affiliations><json:string>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>cardiovascular stress reactivity</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>dehydration</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Paced Auditory Serial Addition Task</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>reaction time</value></json:item></subject><articleId><json:string>CPF750</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>Enhanced hydration increases the human cardiovascular reactivity to mental stress. If reduced water intake has the opposite effect, this would suggest controlling for water deprivation when studying such responses. Blood pressure, heart rate and parasympathetically dominated beat‐to‐beat heart rate fluctuations were assessed during resting baseline and mental stress. Two challenging cognitive‐motor tasks, a 5‐Choice Reaction Time Task (CRTT) and a Paced Auditory Serial Addition Task (PASAT), served as mental stress tests. Eight female and eight male volunteers were examined twice, after 24 h of water deprivation and after normal water intake (counterbalanced order, 7‐day interval). Water deprivation resulted in moderate dehydration with a mean 2·6% decrease of total body weight. Dehydration did neither affect baseline blood pressure, heart rate, nor blood pressure reactivity to mental stress. However, dehydration slightly (−1·2 bpm) diminished heart rate reactivity to the PASAT (P = 0·03) and increased beat‐to‐beat heart rate fluctuations in response to the CRTT (P = 0·05). Dehydration intensified CRTT‐ and PASAT‐induced reductions of beat‐to‐beat heart rate fluctuations in females (gender × dehydration interactions: P = 0·04–0·05). Moderate dehydration induced by water restriction has no effect on blood pressure reactivity to mental stress. The effects on heart rate reactivity are small. However, stress‐induced parasympathetic withdrawal may be fortified during dehydration in females, which suggests controlling for water intake when studying such responses.</abstract><qualityIndicators><score>7.52</score><pdfVersion>1.3</pdfVersion><pdfPageSize>595.276 x 782.362 pts</pdfPageSize><refBibsNative>true</refBibsNative><abstractCharCount>1584</abstractCharCount><pdfWordCount>5324</pdfWordCount><pdfCharCount>34638</pdfCharCount><pdfPageCount>7</pdfPageCount><abstractWordCount>210</abstractWordCount></qualityIndicators><title>Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans</title><refBibs><json:item><author><json:item><name>A Adan</name></json:item><json:item><name>M Sanchez‐Turet</name></json:item></author><host><volume>8</volume><pages><last>132</last><first>129</first></pages><author></author><title>Neuroreport</title></host><title>Cardiac reactivity during task performance: influence of time of day</title></json:item><json:item><author><json:item><name>MT Allen</name></json:item><json:item><name>CM Stoney</name></json:item><json:item><name>JF Owens</name></json:item><json:item><name>KA Matthews</name></json:item></author><host><volume>55</volume><pages><last>517</last><first>505</first></pages><author></author><title>Psychosom Med</title></host><title>Hemodynamic adjustments to laboratory stress: the influence of gender and personality</title></json:item><json:item><author><json:item><name>M Au Duong</name></json:item><json:item><name>B Audoin</name></json:item><json:item><name>K Boulanouar</name></json:item><json:item><name>D Ibarrola</name></json:item><json:item><name>I Malikova</name></json:item><json:item><name>S Confort‐Gouny</name></json:item><json:item><name>P Celsis</name></json:item><json:item><name>J Pelletier</name></json:item><json:item><name>P Cozzone</name></json:item><json:item><name>J Ranjeva</name></json:item></author><host><volume>25</volume><pages><last>1253</last><first>1245</first></pages><author></author><title>J Cereb Blood Flow Metab</title></host><title>Altered functional connectivity related to white matter changes inside the working memory network at the very early stage of MS</title></json:item><json:item><author><json:item><name>LC Becker</name></json:item><json:item><name>CJ Pepine</name></json:item><json:item><name>R Bonsall</name></json:item><json:item><name>JD Cohen</name></json:item><json:item><name>AD Goldberg</name></json:item><json:item><name>C Coghlan</name></json:item><json:item><name>PH Stone</name></json:item><json:item><name>S Forman</name></json:item><json:item><name>G Knatterud</name></json:item><json:item><name>DS Sheps</name></json:item><json:item><name>PG Kaufmann</name></json:item></author><host><volume>94</volume><pages><last>2777</last><first>2768</first></pages><author></author><title>Circulation</title></host><title>Left ventricular, peripheral vascular, and neurohumoral responses to mental stress in normal middle‐aged men and women. 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Imaging</title><doi><json:string>10.1111/(ISSN)1475-097X</json:string></doi></host><categories><wos><json:string>science</json:string><json:string>physiology</json:string></wos><scienceMetrix><json:string>health sciences</json:string><json:string>biomedical research</json:string><json:string>physiology</json:string></scienceMetrix></categories><publicationDate>2007</publicationDate><copyrightDate>2007</copyrightDate><doi><json:string>10.1111/j.1475-097X.2007.00750.x</json:string></doi><id>B42470A7EF062D37C1C2C88AFC4C431DCD30A40E</id><score>1.0724263</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/B42470A7EF062D37C1C2C88AFC4C431DCD30A40E/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/B42470A7EF062D37C1C2C88AFC4C431DCD30A40E/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/B42470A7EF062D37C1C2C88AFC4C431DCD30A40E/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><availability><p>WILEY</p></availability><date>2007</date></publicationStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans</title><author xml:id="author-1"><persName><forename type="first">Lars</forename><surname>Schwabe</surname></persName><affiliation>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</affiliation></author><author xml:id="author-2"><persName><forename type="first">Gabor</forename><surname>Szinnai</surname></persName><affiliation>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</affiliation></author><author xml:id="author-3"><persName><forename type="first">Ulrich</forename><surname>Keller</surname></persName><affiliation>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</affiliation></author><author xml:id="author-4"><persName><forename type="first">Hartmut</forename><surname>Schachinger</surname></persName><affiliation>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</affiliation></author></analytic><monogr><title level="j">Clinical Physiology and Functional Imaging</title><idno type="pISSN">1475-0961</idno><idno type="eISSN">1475-097X</idno><idno type="DOI">10.1111/(ISSN)1475-097X</idno><imprint><publisher>Blackwell Publishing Ltd</publisher><pubPlace>Oxford, UK</pubPlace><date type="published" when="2007-09"></date><biblScope unit="volume">27</biblScope><biblScope unit="issue">5</biblScope><biblScope unit="page" from="291">291</biblScope><biblScope unit="page" to="297">297</biblScope></imprint></monogr><idno type="istex">B42470A7EF062D37C1C2C88AFC4C431DCD30A40E</idno><idno type="DOI">10.1111/j.1475-097X.2007.00750.x</idno><idno type="ArticleID">CPF750</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2007</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Enhanced hydration increases the human cardiovascular reactivity to mental stress. If reduced water intake has the opposite effect, this would suggest controlling for water deprivation when studying such responses. Blood pressure, heart rate and parasympathetically dominated beat‐to‐beat heart rate fluctuations were assessed during resting baseline and mental stress. Two challenging cognitive‐motor tasks, a 5‐Choice Reaction Time Task (CRTT) and a Paced Auditory Serial Addition Task (PASAT), served as mental stress tests. Eight female and eight male volunteers were examined twice, after 24 h of water deprivation and after normal water intake (counterbalanced order, 7‐day interval). Water deprivation resulted in moderate dehydration with a mean 2·6% decrease of total body weight. Dehydration did neither affect baseline blood pressure, heart rate, nor blood pressure reactivity to mental stress. However, dehydration slightly (−1·2 bpm) diminished heart rate reactivity to the PASAT (P = 0·03) and increased beat‐to‐beat heart rate fluctuations in response to the CRTT (P = 0·05). Dehydration intensified CRTT‐ and PASAT‐induced reductions of beat‐to‐beat heart rate fluctuations in females (gender × dehydration interactions: P = 0·04–0·05). Moderate dehydration induced by water restriction has no effect on blood pressure reactivity to mental stress. The effects on heart rate reactivity are small. However, stress‐induced parasympathetic withdrawal may be fortified during dehydration in females, which suggests controlling for water intake when studying such responses.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>keywords</head><item><term>cardiovascular stress reactivity</term></item><item><term>dehydration</term></item><item><term>Paced Auditory Serial Addition Task</term></item><item><term>reaction time</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="2007-09">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/B42470A7EF062D37C1C2C88AFC4C431DCD30A40E/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>Blackwell Publishing Ltd</publisherName><publisherLoc>Oxford, UK</publisherLoc></publisherInfo><doi origin="wiley" registered="yes">10.1111/(ISSN)1475-097X</doi><issn type="print">1475-0961</issn><issn type="electronic">1475-097X</issn><idGroup><id type="product" value="CPF"></id><id type="publisherDivision" value="ST"></id></idGroup><titleGroup><title type="main" sort="CLINICAL PHYSIOLOGY FUNCTIONAL IMAGING">Clinical Physiology and Functional Imaging</title></titleGroup></publicationMeta><publicationMeta level="part" position="09005"><doi origin="wiley">10.1111/cpf.2007.27.issue-5</doi><numberingGroup><numbering type="journalVolume" number="27">27</numbering><numbering type="journalIssue" number="5">5</numbering></numberingGroup><coverDate startDate="2007-09">September 2007</coverDate></publicationMeta><publicationMeta level="unit" type="article" position="5" status="forIssue"><doi origin="wiley">10.1111/j.1475-097X.2007.00750.x</doi><idGroup><id type="unit" value="CPF750"></id></idGroup><countGroup><count type="pageTotal" number="7"></count></countGroup><titleGroup><title type="tocHeading1">Original Articles</title></titleGroup><eventGroup><event type="firstOnline" date="2007-05-15"></event><event type="publishedOnlineFinalForm" date="2007-05-15"></event><event type="xmlConverted" agent="Converter:BPG_TO_WML3G version:2.3.2 mode:FullText source:FullText result:FullText" date="2010-03-13"></event><event type="xmlConverted" agent="Converter:WILEY_ML3G_TO_WILEY_ML3GV2 version:3.8.8" date="2014-01-16"></event><event type="xmlConverted" agent="Converter:WML3G_To_WML3G version:4.1.7 mode:FullText,remove_FC" date="2014-10-16"></event></eventGroup><numberingGroup><numbering type="pageFirst" number="291">291</numbering><numbering type="pageLast" number="297">297</numbering></numberingGroup><correspondenceTo>Hartmut Schachinger, Department of Clinical Physiology, Institute of Psychobiology, University of Trier, Johanniterufer 15, 54290 Trier, Germany
E‐mail: <email normalForm="schaechi@uni-trier.de">schaechi@uni‐trier.de</email></correspondenceTo><linkGroup><link type="toTypesetVersion" href="file:CPF.CPF750.pdf"></link></linkGroup></publicationMeta><contentMeta><unparsedEditorialHistory><b>Accepted for publication</b> <i>Received 16 January 2007; accepted 4 April 2007</i></unparsedEditorialHistory><countGroup><count type="figureTotal" number="0"></count><count type="tableTotal" number="1"></count></countGroup><titleGroup><title type="main">Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans</title><title type="shortAuthors">L. Schwabe et al.</title><title type="short">Dehydration does not affect BP reactivity</title></titleGroup><creators><creator creatorRole="author" xml:id="cr1" affiliationRef="#a1"><personName><givenNames>Lars</givenNames><familyName>Schwabe</familyName></personName></creator><creator creatorRole="author" xml:id="cr2" affiliationRef="#a2"><personName><givenNames>Gabor</givenNames><familyName>Szinnai</familyName></personName></creator><creator creatorRole="author" xml:id="cr3" affiliationRef="#a2"><personName><givenNames>Ulrich</givenNames><familyName>Keller</familyName></personName></creator><creator creatorRole="author" xml:id="cr4" affiliationRef="#a1"><personName><givenNames>Hartmut</givenNames><familyName>Schachinger</familyName></personName></creator></creators><affiliationGroup><affiliation xml:id="a1" countryCode="DE"><unparsedAffiliation>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</unparsedAffiliation></affiliation><affiliation xml:id="a2" countryCode="CH"><unparsedAffiliation>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</unparsedAffiliation></affiliation></affiliationGroup><keywordGroup xml:lang="en"><keyword xml:id="k1">cardiovascular stress reactivity</keyword><keyword xml:id="k2">dehydration</keyword><keyword xml:id="k3">Paced Auditory Serial Addition Task</keyword><keyword xml:id="k4">reaction time</keyword></keywordGroup><abstractGroup><abstract type="main" xml:lang="en"><title type="main">Summary</title><p>Enhanced hydration increases the human cardiovascular reactivity to mental stress. If reduced water intake has the opposite effect, this would suggest controlling for water deprivation when studying such responses. Blood pressure, heart rate and parasympathetically dominated beat‐to‐beat heart rate fluctuations were assessed during resting baseline and mental stress. Two challenging cognitive‐motor tasks, a 5‐Choice Reaction Time Task (CRTT) and a Paced Auditory Serial Addition Task (PASAT), served as mental stress tests. Eight female and eight male volunteers were examined twice, after 24 h of water deprivation and after normal water intake (counterbalanced order, 7‐day interval). Water deprivation resulted in moderate dehydration with a mean 2·6% decrease of total body weight. Dehydration did neither affect baseline blood pressure, heart rate, nor blood pressure reactivity to mental stress. However, dehydration slightly (−1·2 bpm) diminished heart rate reactivity to the PASAT (<i>P</i> = 0·03) and increased beat‐to‐beat heart rate fluctuations in response to the CRTT (<i>P</i> = 0·05). Dehydration intensified CRTT‐ and PASAT‐induced reductions of beat‐to‐beat heart rate fluctuations in females (gender × dehydration interactions: <i>P</i> = 0·04–0·05). Moderate dehydration induced by water restriction has no effect on blood pressure reactivity to mental stress. The effects on heart rate reactivity are small. However, stress‐induced parasympathetic withdrawal may be fortified during dehydration in females, which suggests controlling for water intake when studying such responses.</p></abstract></abstractGroup></contentMeta><noteGroup><note xml:id="fn1"><label>*</label><p> Although the program <sc>gpower</sc> uses the effect size <i>f</i><sup>2</sup> we present the more common effect size ω<sup>2</sup>. The two effect sizes can be transformed into one another by the formula: ω<sup>2</sup>=<i>f</i><sup>2</sup>/1 + <i>f</i><sup>2</sup>.</p></note></noteGroup></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Dehydration does not affect BP reactivity</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Dehydration does not influence cardiovascular reactivity to behavioural stress in young healthy humans</title></titleInfo><name type="personal"><namePart type="given">Lars</namePart><namePart type="family">Schwabe</namePart><affiliation>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Gabor</namePart><namePart type="family">Szinnai</namePart><affiliation>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Ulrich</namePart><namePart type="family">Keller</namePart><affiliation>Division of Endocrinology, Diabetes and Clinical Nutrition, Department of Internal Medicine, University Hospital, Basel, Switzerland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Hartmut</namePart><namePart type="family">Schachinger</namePart><affiliation>Department of Clinical Physiology, University of Trier, Institute of Psychobiology, Trier, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>Blackwell Publishing Ltd</publisher><place><placeTerm type="text">Oxford, UK</placeTerm></place><dateIssued encoding="w3cdtf">2007-09</dateIssued><edition>Accepted for publication Received 16 January 2007; accepted 4 April 2007</edition><copyrightDate encoding="w3cdtf">2007</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="tables">1</extent></physicalDescription><abstract lang="en">Enhanced hydration increases the human cardiovascular reactivity to mental stress. If reduced water intake has the opposite effect, this would suggest controlling for water deprivation when studying such responses. Blood pressure, heart rate and parasympathetically dominated beat‐to‐beat heart rate fluctuations were assessed during resting baseline and mental stress. Two challenging cognitive‐motor tasks, a 5‐Choice Reaction Time Task (CRTT) and a Paced Auditory Serial Addition Task (PASAT), served as mental stress tests. Eight female and eight male volunteers were examined twice, after 24 h of water deprivation and after normal water intake (counterbalanced order, 7‐day interval). Water deprivation resulted in moderate dehydration with a mean 2·6% decrease of total body weight. Dehydration did neither affect baseline blood pressure, heart rate, nor blood pressure reactivity to mental stress. However, dehydration slightly (−1·2 bpm) diminished heart rate reactivity to the PASAT (P = 0·03) and increased beat‐to‐beat heart rate fluctuations in response to the CRTT (P = 0·05). Dehydration intensified CRTT‐ and PASAT‐induced reductions of beat‐to‐beat heart rate fluctuations in females (gender × dehydration interactions: P = 0·04–0·05). Moderate dehydration induced by water restriction has no effect on blood pressure reactivity to mental stress. The effects on heart rate reactivity are small. However, stress‐induced parasympathetic withdrawal may be fortified during dehydration in females, which suggests controlling for water intake when studying such responses.</abstract><subject lang="en"><genre>keywords</genre><topic>cardiovascular stress reactivity</topic><topic>dehydration</topic><topic>Paced Auditory Serial Addition Task</topic><topic>reaction time</topic></subject><relatedItem type="host"><titleInfo><title>Clinical Physiology and Functional Imaging</title></titleInfo><genre type="journal">journal</genre><identifier type="ISSN">1475-0961</identifier><identifier type="eISSN">1475-097X</identifier><identifier type="DOI">10.1111/(ISSN)1475-097X</identifier><identifier type="PublisherID">CPF</identifier><part><date>2007</date><detail type="volume"><caption>vol.</caption><number>27</number></detail><detail type="issue"><caption>no.</caption><number>5</number></detail><extent unit="pages"><start>291</start><end>297</end><total>7</total></extent></part></relatedItem><identifier type="istex">B42470A7EF062D37C1C2C88AFC4C431DCD30A40E</identifier><identifier type="DOI">10.1111/j.1475-097X.2007.00750.x</identifier><identifier type="ArticleID">CPF750</identifier><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>Blackwell Publishing Ltd</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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