| Autor: |
W, Gehrig, P, Meyer, H, Ising, K D, Kuhl, R, Schmidt, W, Grützmacher |
| Jazyk: |
němčina |
| Rok vydání: |
1993 |
| Předmět: |
|
| Zdroj: |
Schriftenreihe des Vereins fur Wasser-, Boden- und Lufthygiene. 88 |
| ISSN: |
0300-8665 |
| Popis: |
The auditory thresholds of about 60 anaesthetized guinea pigs were determined at 3 or 4 frequencies between 2 and 20 kHz using the acoustically evoked brain stem potentials. The animals were then exposed to electro-acoustically reproduced MLAF noise with peak levels between 120 and 130 dB(A). The exposure occurred either once or else four times within either 3 or 60 minutes. The level of noise increased at 7.5 and 75 dB/s (slow and fast increase). TTS was then determined. PTS was measured one week later. In over half the animals, exposure to rapidly increasing noise level with a peak of 126 dB(A) induced PTSor = 30 dB for at least one frequency. Exposure to a slowly increasing noise level with the same peak provoked significantly smaller PTS. 4 exposures to a rapidly rising noise level within 3 minutes induced significantly smaller PTS than the same dosage within 60 minutes. Only in the latter case was PTS greater than TTS. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
