The influence of whole body vibration on noise-induced hearing loss: a review of animal experiments.
Hamernik-RP; Ahroon-WA; Davis-RI
Recent advances in researches on the combined effects of environmental factors: proceedings of The Third International Conference on the Combined Effects of Environmental Factors held in Tampere, Finland, 15-18 August 1988. Manninen O, Pitkänen S, Manninen R, Hallila M, eds. Tampere, Finland: Pk-Paino Oy Printing House, 1988 Aug; :223-238
There is the suggestion in the literature that vibration may potentate the effects of noise and may thus increase the risk of hearing loss. However in human experimental studies, which, by necessity, are limited to low levels of TTS, the effects measured while generally consistent, are relatively small. A very limited number of animal studies have also shown an enhanced hearing loss in the presence of vibration, but the scope of these studies is limited. Also the large intersubject variability and small number of subjects in some of these studies makes the data difficult to interpret with any degree of confidence. Furthermore, the high levels of stimulation that were used in some of these animal experiments were not typical of realistic exposure situations. Our recent animal studies (chinchilla) have used a 30 HZ, 3g rms and a 20 HZ, 2g rms cage vibration in combination with continuous noise (95 dB, 0.5 kHz octave band) and impact noise (113, 119 or 125 dB peak SPL) exposure paradigms. All exposures lasted for five days. The impact noise exposures were designed to have equal total energy. Temporary (and combined) and permanent threshold shifts were measured using evoked potentials. The results obtained from each of the above paradigms were consistent in showing that the presence of vibration did not have a statistically significant effect on hearing thresholds.
Industrial-noise; Noise; Noise-exposure; Noise-frequencies; Environmental-exposure; Exposure-levels; Audiofrequency; Sound; Environmental-exposure; Environmental-hazards; Hazards; Sensory-thresholds; Models; Acoustics; Acoustic-signals; Animals; Laboratory-animals; Hearing-loss; Hearing; Vibration; Vibration-effects; Vibration-exposure; Cellular-function; Cellular-reactions; Cell-function
Manninen-O; Pitkänen-S; Manninen-R; Hallila-M
Recent advances in researches on the combined effects of environmental factors: proceedings of The Third International Conference on the Combined Effects of Environmental Factors held in
Plattsburgh State University, New York