Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

Noise-induced hearing loss in the noise-toughened auditory system.

Authors
Ahroon-WA; Hamernik-RP
Source
Hear Res 1999 Mar; 129(1-2):101-110
NIOSHTIC No.
20029980
Abstract
The auditory system, toughened by an interrupted noise exposure, has been shown in several reports to be less affected by (or protected from) a subsequent high-level noise exposure. Exposure to 115 dB peak SPL, 1 kHz narrow band (400 Hz) transients presented l/s, 6 h/day, to four groups of chinchillas produced a 10-28 dB toughening effect across the 0.5-8.0 kHz test frequency range. Following either a 30 day or an 18 h recovery period the animals were exposed to the same impulses but presented at 121 or 127 dB peak SPL for five uninterrupted days, thus producing an asymptotic threshold shift (ATS) condition. Comparisons between toughened and untoughened control subjects showed: (1) During the 121 dB exposure there was a statistically significant reduction of 10-25 dB in ATS across the entire test frequency range. Thirty days following the 121 dB exposure there were no significant differences in the postexposure permanent effects on thresholds and sensory cell loss. (2) During the 127 dB exposure only the group with the 30 day interval between the toughening and traumatic exposures showed a small (approximately 10 dB), statistically significant, frequency-specific (8 kHz), reduction in ATS. Thirty days following the 127 dB exposure a statistically significant protective effect on threshold was measured only at 16.0 kHz. However, both toughened groups showed less inner hair cell loss at and above 1.0 kHz, while only the group with the 18 h interval between the toughening and traumatic exposures showed less outer hair cell loss at and above 1.0 kHz. There were no systematic differences in the response of the toughened animals that could be attributed to the 30 day or 18 h post-toughening interval.
Keywords
Noise-induced-hearing-loss; Animal-studies; Cell-damage; Noise-exposure; Ear-disorders; Industrial-noise; Impulse-noise; Hearing-loss; Author Keywords: Noise-induced hearing loss
Contact
Auditory Research Laboratory, Plattsburgh State University of New York, 12901-2681
CODEN
HERED3
Publication Date
19990301
Document Type
Journal Article
Email Address
ahroonwa@splava.cc.plattsburgh.edu
Funding Amount
2829511
Funding Type
Grant
Fiscal Year
1999
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R01-OH-02317
Issue of Publication
1-2
ISSN
0378-5955
Source Name
Hearing Research
State
NY
Performing Organization
Communicative Disorders & Scis Research Foundation of Suny P O Box 9 Albany, N Y 12201
TOP