| Local exposure of the rat cortex to radiofrequency electromagnetic fields increases local cerebral blood flow along with temperature. | |
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MedLine Citation:
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PMID: 21030669 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Few studies have shown that local exposure to radiofrequency electromagnetic fields (RF) induces intensity-dependent physiological changes, especially in the brain. The aim of the present study was to detect reproducible responses to local RF exposure in the parietal cortex of anesthetized rats and to determine their dependence on RF intensity. The target cortex tissue was locally exposed to 2-GHz RF using a figure-eight loop antenna within a range of averaged specific absorption rates (10.5, 40.3, 130, and 263 W/kg averaged over 4.04 mg) in the target area. Local cerebral blood flow (CBF) and temperatures in three regions (target area, rectum, and calf hypodermis) were measured using optical fiber blood flow meters and thermometers during RF exposure. All parameters except for the calf hypodermis temperature increased significantly in exposed animals compared with sham-exposed ones during 18-min exposures. Dependence of parameter values on exposure intensity was analyzed using linear regression models. The elevation of local CBF was correlated with temperature rise in both target and rectum at the end of RF exposure. However, the local CBF elevation seemed to be elevated by the rise in target temperature, but not by that of the rectal temperature, in the early part of RF exposure or at low-intensity RF exposure. These findings suggest that local RF exposure of the rat cortex drives a regulation of CBF accompanied by a local temperature rise, and our findings may be helpful for discussing physiological changes in the local cortex region, which is locally exposed to RF. |
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Authors:
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Hiroshi Masuda; Akimasa Hirata; Hiroki Kawai; Kanako Wake; Soichi Watanabe; Takuji Arima; Florence Poulletier de Gannes; Isabelle Lagroye; Bernard Veyret |
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Publication Detail:
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Type: Journal Article Date: 2010-10-28 |
Journal Detail:
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Title: Journal of applied physiology (Bethesda, Md. : 1985) Volume: 110 ISSN: 1522-1601 ISO Abbreviation: J. Appl. Physiol. Publication Date: 2011 Jan |
Date Detail:
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Created Date: 2011-01-13 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8502536 Medline TA: J Appl Physiol Country: United States |
Other Details:
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Languages: eng Pagination: 142-8 Citation Subset: IM |
Affiliation:
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Univ. Bordeaux, IMS laboratory, IMS-ENSCBP, 16 av. Pey Berland Pessac, 33607, France. hiroshi.masuda@ims-bordeaux.fr. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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