| Posture systematically alters ear-canal reflectance and DPOAE properties. | |
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MedLine Citation:
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PMID: 20227475 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Several studies have demonstrated that the auditory system is sensitive to changes in posture, presumably through changes in intracranial pressure (ICP) that in turn alter the intracochlear pressure, which affects the stiffness of the middle-ear system. This observation has led to efforts to develop an ear-canal based noninvasive diagnostic measure for monitoring ICP, which is currently monitored invasively via access through the skull or spine. Here, we demonstrate the effects of postural changes, and presumably ICP changes, on distortion product otoacoustic emissions (DPOAE) magnitude, DPOAE angle, and power reflectance. Measurements were made on 12 normal-hearing subjects in two postural positions: upright at 90 degrees and tilted at -45 degrees to the horizontal. Measurements on each subject were repeated five times across five separate measurement sessions. All three measures showed significant changes (p<0.001) between upright and tilted for frequencies between 500 and 2000 Hz, and DPOAE angle changes were significant at all measured frequencies (500-4000 Hz). Intra-subject variability, assessed via standard deviations for each subject's multiple measurements, were generally smaller in the upright position relative to the tilted position. |
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Authors:
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Susan E Voss; Modupe F Adegoke; Nicholas J Horton; Kevin N Sheth; Jonathan Rosand; Christopher A Shera |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S. Date: 2010-03-19 |
Journal Detail:
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Title: Hearing research Volume: 263 ISSN: 1878-5891 ISO Abbreviation: Hear. Res. Publication Date: 2010 May |
Date Detail:
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Created Date: 2010-05-10 Completed Date: 2010-08-20 Revised Date: 2012-05-07 |
Medline Journal Info:
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Nlm Unique ID: 7900445 Medline TA: Hear Res Country: Netherlands |
Other Details:
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Languages: eng Pagination: 43-51 Citation Subset: IM |
Copyright Information:
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Copyright (c) 2010 Elsevier B.V. All rights reserved. |
Affiliation:
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Picker Engineering Program, Smith College, 51 College Lane, Northampton, MA 01063, USA. svoss@smith.edu |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustic Impedance Tests Adult Biomechanics Ear Canal / physiology* Ear, Middle / physiology Female Head-Down Tilt / physiology Humans Intracranial Pressure / physiology* Male Otoacoustic Emissions, Spontaneous / physiology* Posture / physiology* Pressure Young Adult |
| Grant Support | |
ID/Acronym/Agency:
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R01 DC003687/DC/NIDCD NIH HHS; R01 DC003687-06/DC/NIDCD NIH HHS; R01 DC003687-07/DC/NIDCD NIH HHS; R01 DC003687-08/DC/NIDCD NIH HHS; R01 DC003687-09/DC/NIDCD NIH HHS; R01 DC003687-10/DC/NIDCD NIH HHS; R01 DC003687-12/DC/NIDCD NIH HHS; R01 DC003687-13/DC/NIDCD NIH HHS |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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