| Impact of exercise on retinal microvascular regulation measured by dynamic vessel analysis in healthy individuals. | |
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MedLine Citation:
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PMID: 22296637 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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We assessed the acute impact of physical exercise on the retinal vessel diameter and the regulation of vasoconstriction and vasodilatation owing to flicker that has never been examined before. Forty young (mean age 24 years) healthy subjects (26 women and 14 men) had retinal examinations with dynamic vessel analysis prior and after (0·5, 1·5 and 2·5 h) intense exercise of 20 min. The measurements were always taken on continuous same eye, each with a 350-s permanent dynamic vascular analysis including three cycles of 20 s with 12·5-Hz flicker provocation of the retinal vessel analyser system (RVA) device. Blood pressure values were measured before and after the dynamic vessel analysis with a portable, automatic blood pressure monitor. Dynamic vessel analysis revealed that exercise had a substantial quickly and long-lasting effect on arterial and venous diameter (F = 30·38 and 35·85, P<0·001) and arterial dilatation owing to flicker (F = 10·67, P<0·005). The effect of flicker on arterial constriction was not significant for all time periods (F = 0·26). Friedman test revealed that arterial constriction to flicker was significantly increased at 30 and 90 min (χ(2) = 43·3 and 49·2, P<0·001). Exercise had a significant effect on venous constriction and dilatation owing to flicker (F = 11·14, P<0·001, F = 3·77, P<0·05). Our results demonstrate that the expected impact of exercise can be accurately assessed with the RVA. We therefore suggest that the RVA is a valid instrument to assess early structural and functional alterations in the retinal vascular system. |
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Authors:
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Torben Rueddel; Matthias Kneser; Frank Tost |
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Publication Detail:
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Type: Journal Article Date: 2011-12-08 |
Journal Detail:
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Title: Clinical physiology and functional imaging Volume: 32 ISSN: 1475-097X ISO Abbreviation: Clin Physiol Funct Imaging Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-02-02 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101137604 Medline TA: Clin Physiol Funct Imaging Country: England |
Other Details:
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Languages: eng Pagination: 158-61 Citation Subset: IM |
Copyright Information:
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© 2011 The Authors. Clinical Physiology and Functional Imaging © 2011 Scandinavian Society of Clinical Physiology and Nuclear Medicine. |
Affiliation:
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Department of Ophthalmology, University of Greifswald, Greifswald, Germany. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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