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  • Threshold Shift.
  • Temporary hearing threshold shifts – the silence that follows a big night out.
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One such factor is physical exercise. Although this is generally good for the body, combined noise exposure during highly physical activities was shown to produce a greater TTS than just the noise exposure alone. Heat exposure is another risk factor.

threshold shift (ward 54)

As blood temperature rises, TTS increases when paired with high-frequency noise exposure. Finally, contact with ototoxic chemicals such as styrene, toluene and carbon disulfide heighten the risk of auditory damages.

It is important to understand that noise exposure itself is the main influential factor in threshold shifts and auditory fatigue, but that individuals may be at greater risk when synergistic effects take place during interactions with the above factors. Scientists construct carbon nanotube device that can detect colors of the rainbow.

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Rudmose and Ward independently demonstrated that when high intensity pure tones reach the cochlea in the 1 kHz to 3 kHz frequency range, the resulting threshold shift occurs approximately a half to one whole octave above the pure tone exposure. Cohort case studies on acoustic trauma in operation Iraqi freedom. A threshold shift is just a fancy way of saying that the quietest level at which you once could hear your threshold for hearing has changed significantly--for the worse.


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Your only chance for a one-time good deal. Although significantly less than that associated with an immediate permanent threshold shift , such an exposure could cause a temporary threshold shift.

Auditory fatigue

Noise exposure levels in stock car auto racing. Defines work-related significant threshold shift for entry into WESS as an occupational injury.

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Industrial Noise Services, Inc. The effect of noise levels of 90 decibels or higher on hearing loss was investigated in employees of a canning facility. Workers exposed for 1, 5, 10, or 15 years were given audiometry tests for temporary threshold shift TTS and permanent threshold shift PTS 2 or 30 minutes after noise exposure.

The TTS decreased in magnitude with increasing exposure to noise levels.