사업장 소음 폭로에 의한 일과성 역치 상승과 회복 = Noise-Induced Temporary Threshold Shift and its Recovery in Industry

다국어 초록 (Multilingual Abstract)

To determine the recovery time from noise-induced temporary threshold shift(TTS), a prospective field study was conducted at three worksites where workers are known to be exposed high level of noise. Subjects were selected according to answers on a questionnaire which inquired about otological history and previous noise exposure, including avocational, military and occupational exposures. After excluding employee with past otologic problems, recent exposure to high level noise, and under medications, total 92 employees participated in the study. Among 92 participants, complete consecutive audiometric examinations were carried out at 0∼2 hours, 5∼7 hours, 14∼16 hours after worktime noise exposure on 26 participants wearing hearing protectors and 22 participants wearing no protective devices.
The difference between the hearing level 0∼2 hours after noise exposure and 5∼7 hours is statistically significant by paired t-test(p<0.01). The median recovery times calculated from the data of 22 participants wearing no protective hearing devices are 15.6 hours at 4000Hz, and 7.7 hours, 10.3 hours, 8.4 hours at 1000Hz, 2000Hz and 8000Hz respectively. These data suggest that when measuring the pure tone audiometry for noise exposed workers, at least 16 hours noise-free interval is required.

목차 (Table of Contents)

• 서 론
• 연구 대상 및 방법
• 1. 연구 대상 사업장 및 연구대상자 선정
• 2. 자료 수집
• 1) 소음폭로수준 측정
• 2) 조사대상자의 일반적 특성 및 청력검사
• 3. 분석 방법
• 결 과
• 1. 소음 폭로수준
• 2. 연구 대상자의 일반적 특성
• 3. 시간경과에 따른 청력변화의 양상
• 1) 소음 폭로 후 시간 경과에 따른 청력치의 변화
• 2) 정상 청력 회복 소요시간 추정
• 고 찰
• 결 론
• 참고문헌