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Objective: In this study, protective role of olivocochlear efferent system activation on hearing system in young individuals after music exposure (ME) was investigated. Methods: Twenty two young adults between the ages of 19-22 years (Mean age ± SD = 19.63 ± 0.83) with normal hearing participated in the study. All participants listened to music at 85.4 dBA for 30 minutes. Audiological evaluation including pure tone audiometry, immittance measurements, Distortion Product Otoacoustic Emissions (DPOAEs), and Transient Evoked Otoacoustic Emissions (TEOAEs) with and without contralateral acoustic stimuli was done before ME, immediately after listening to music, and after rest period. Results: No significant differences in pure tone audiometry and DPOAE signal-to-noise ratio (S/N-R) results were found among three measurement sessions (before ME, immediately after ME, and after rest period) in the measured all frequencies (p>0.05). There was a significant increase in the contralateral stapes reflex threshold at 0.5 kHz measured immediately after ME (p=0.02) while no significant difference was found in the measured frequency after resting (p>0.05). In the TEOAE S/NR responses, a statistically significant decrease was found at 1 kHz (p = 0.016) and 1.4 kHz (p = 0.009) immediately after ME, whereas no significant difference was found between TEOAE S/N-R responses measured before ME and after resting conditions (p>0.05). Compared to before exposure, there was a statistically significant decrease (p <0.001) in all center frequencies measured immediately after ME and after resting conditions in TEOAE amplitudes obtained in the presence of CAS. Conclusion: The contralateral stapes reflex thresholds increase after exposure to music and the significant suppression effect of TEOAE amplitudes in the presence of CAS suggests that the olivocochlear efferent system plays a role in protecting auditory system from acoustic trauma. [ABSTRACT FROM AUTHOR]

Objective: In this study, protective role of olivocochlear efferent system activation on hearing system in young individuals after music exposure (ME) was investigated. Methods: Twenty two young adults between the ages of 19-22 years (Mean age ± SD = 19.63 ± 0.83) with normal hearing participated in the study. All participants listened to music at 85.4 dBA for 30 minutes. Audiological evaluation including pure tone audiometry, immittance measurements, Distortion Product Otoacoustic Emissions (DPOAEs), and Transient Evoked Otoacoustic Emissions (TEOAEs) with and without contralateral acoustic stimuli was done before ME, immediately after listening to music, and after rest period. Results: No significant differences in pure tone audiometry and DPOAE signal-to-noise ratio (S/N-R) results were found among three measurement sessions (before ME, immediately after ME, and after rest period) in the measured all frequencies (p>0.05). There was a significant increase in the contralateral stapes reflex threshold at 0.5 kHz measured immediately after ME (p=0.02) while no significant difference was found in the measured frequency after resting (p>0.05). In the TEOAE S/NR responses, a statistically significant decrease was found at 1 kHz (p = 0.016) and 1.4 kHz (p = 0.009) immediately after ME, whereas no significant difference was found between TEOAE S/N-R responses measured before ME and after resting conditions (p>0.05). Compared to before exposure, there was a statistically significant decrease (p <0.001) in all center frequencies measured immediately after ME and after resting conditions in TEOAE amplitudes obtained in the presence of CAS. Conclusion: The contralateral stapes reflex thresholds increase after exposure to music and the significant suppression effect of TEOAE amplitudes in the presence of CAS suggests that the olivocochlear efferent system plays a role in protecting auditory system from acoustic trauma. [ABSTRACT FROM AUTHOR]