Accession Number : AD0699790

Title :   TEMPORARY THRESHOLD SHIFT RECOVERY FROM IMPULSE AND STEADY STATE NOISE EXPOSURE.

Descriptive Note : Progress rept.,

Corporate Author : ARMY MEDICAL RESEARCH LAB FORT KNOX KY

Personal Author(s) : Fletcher,John L.

Report Date : 06 AUG 1969

Pagination or Media Count : 13

Abstract : 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)

Descriptors :   (*NOISE, *THRESHOLDS(PHYSIOLOGY)), HEARING, EXPOSURE(PHYSIOLOGY), RECOVERY, TIME, STIMULATION(PHYSIOLOGY), RESPONSE(BIOLOGY)

Subject Categories : Anatomy and Physiology
      Stress Physiology

Distribution Statement : APPROVED FOR PUBLIC RELEASE