TEMPORARY THRESHOLD SHIFT RECOVERY FROM IMPULSE AND STEADY STATE NOISE EXPOSURE.
ARMY MEDICAL RESEARCH LAB FORT KNOX KY
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Fifteen young male subjects with hearing levels in the range of 125-8000 Hz no worse than 25 dB were exposed to impulse and continuous noise separately until a criterion temporary threshold shift TTS of 25 dB at any of the frequencies monitored was reached. Recovery from the TTS was then observed at frequencies from 3-14 KHz for time intervals of 15 mins, 30 mins, 1 hr, 2 hrs, 4 hrs, and 7 hrs post-exposure. Recovery curves from impulse noise induced TTS differed significantly from the continuous noise TTS curves, with recovery much slower from impulse TTS. Results indicate the need for further research in this area. Author
- Anatomy and Physiology
- Stress Physiology