Susceptibility to noise exposure during postnatal development in rats

Hearing Research
N Rybalko, J Syka

Abstract

Susceptibility to noise-induced hearing loss was studied during maturation in 20 female pigmented rats (strain Long-Evans). Young rats, 3, 4, 5 and 6-7 weeks old, were exposed for 1 h to a broad-band noise with an intensity of 120 dB SPL. The thresholds and amplitudes of middle latency responses (MLR) recorded from electrodes implanted on the surface of the auditory cortex were analyzed before and after noise exposure. The results were compared with data from our previous study, in which the effects of broad-band noise exposure on MLR were investigated in adult rats [Syka, J. and Rybalko, N. (2000) Hear. Res. 139, 59-68]. The hearing thresholds of 3-7 week old rats before noise exposure were within the normal adult range. Noise exposure in young rats produced an adult-like pattern with an elevation of hearing thresholds. One-two weeks post-exposure a recovery of MLR thresholds was observed, though full recovery only occurred in the low frequency range. Recovery of hearing thresholds in the high frequency range depended on the age of the animal at the time of exposure. In all animals aged less that 6-7 weeks, exposure resulted in a permanent threshold shift in the range of 4-32 kHz. The mean values of permanent threshold shifts ...Continue Reading

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Citations

Jan 13, 2006·Journal of the Association for Research in Otolaryngology : JARO·Naotaka Aizawa, Jos J Eggermont
Dec 4, 2003·Hearing Research·Jiri PopelarJosef Syka
Nov 20, 2014·Brain Structure & Function·Ladislav OudaJosef Syka
Jul 6, 2010·The European Journal of Neuroscience·Zbynek BuresJosef Syka
Jan 26, 2005·Hearing Research·N Rybalko, J Syka
Feb 9, 2006·Neurobiology of Aging·Jiri PopelarJosef Syka
May 28, 2011·Hearing Research·Pierre CampoCécile Parietti-Winkler
Mar 10, 2015·Behavioural Brain Research·Natalia RybalkoJosef Syka
Dec 5, 2019·The Journal of the Acoustical Society of America·Avril Genene HoltRichard Altschuler
Dec 5, 2019·The Journal of the Acoustical Society of America·Celia D EscabiEdward Lobarinas

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