title: Acoustic trauma effects from doubling the exposure time.
abstract: Guinea pigs were exposed to 20 kHz for a period of 1 or 2 h, with and without an intermediate recovery period. Statistically smaller areas of damage were obtained after doubling the exposure time, especially without a recovery period. For a double exposure with a recovery period the areas of damage were the same as for the single exposures.
mesh_terms: D000818:Animals; D006168:Guinea Pigs; D006317:Hearing Loss, Noise-Induced / Q000209:etiology*; D009622:Noise; D013995:Time