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Predicate | Object |
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rdf:type | |
lifeskim:mentions | |
pubmed:issue |
2
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pubmed:dateCreated |
1988-5-26
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pubmed:abstractText |
Dose-response curves for intravenous bolus injections of isoprenaline were carried out in 40 normal subjects, in four groups of 10 comprising young and middle-aged males and females. The isoprenaline dose required to raise the heart rate by 50 beats/min, the CD50 (chronotropic dose 50 beats/min), was calculated individually and taken as a measure of the beta-adrenergic responsiveness. Females had significantly higher sensitivity to isoprenaline than males, i.e. lower CD50 values (95% confidence interval 0.07-0.11 versus 0.12-0.17 micrograms/kg body weight, p less than 0.001), and young subjects had higher sensitivity than middle-aged subjects (95% confidence interval for CD50 0.07-0.10 versus 0.12-0.18 microgram/kg body weight, p less than 0.001). Dose-response curves were also carried out for intravenous prenalterol, a partial beta 1-adrenergic agonist. The maximal heart-rate response to prenalterol (delta HRP) showed a significant inverse linear relationship with the CD50 (delta HRP = 44.8-0.11 x CD50, r = -0.53, rs = -0.69, p less than 0.001). A mental stress programme and isometric exercise gave significant increases in heart rate and blood pressure for all groups, but there was no significant relationship between the CD50 and the heart-rate response. By applying a theoretical model, developed by Kenakin and Beek [13], to the isoprenaline-prenalterol data, it is suggested that the observed age and sex differences in beta-adrenergic responsiveness are caused by a tissue-related difference in the stimulus-response mechanism.
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pubmed:language |
eng
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pubmed:journal | |
pubmed:citationSubset |
IM
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pubmed:chemical | |
pubmed:status |
MEDLINE
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pubmed:month |
Apr
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pubmed:issn |
0036-5513
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pubmed:author | |
pubmed:issnType |
Print
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pubmed:volume |
48
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pubmed:owner |
NLM
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pubmed:authorsComplete |
Y
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pubmed:pagination |
183-91
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pubmed:dateRevised |
2007-11-15
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pubmed:meshHeading |
pubmed-meshheading:2895960-Adrenergic beta-Agonists,
pubmed-meshheading:2895960-Adult,
pubmed-meshheading:2895960-Age Factors,
pubmed-meshheading:2895960-Dose-Response Relationship, Drug,
pubmed-meshheading:2895960-Female,
pubmed-meshheading:2895960-Hemodynamics,
pubmed-meshheading:2895960-Humans,
pubmed-meshheading:2895960-Isometric Contraction,
pubmed-meshheading:2895960-Isoproterenol,
pubmed-meshheading:2895960-Male,
pubmed-meshheading:2895960-Middle Aged,
pubmed-meshheading:2895960-Muscle Contraction,
pubmed-meshheading:2895960-Prenalterol,
pubmed-meshheading:2895960-Sex Factors,
pubmed-meshheading:2895960-Stress, Psychological
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pubmed:year |
1988
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pubmed:articleTitle |
Age and sex differences in cardiovascular reactivity to adrenergic agonists, mental stress and isometric exercise in normal subjects.
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pubmed:affiliation |
Department of Medicine I, Sahlgren's Hospital, University of Gothenburg, Sweden.
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pubmed:publicationType |
Journal Article,
Comparative Study,
Research Support, Non-U.S. Gov't
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