What noise level above which auditory and non-auditory effects can occur in laboratory animals?

What noise level above which auditory and non-auditory effects can occur in laboratory animals?

• A. Above 70 dB
• B. Above 85 dB
• C. Above 95 dB
• D. Above 100 dB

Answer: (B)

Auditory systems and systemic stress in lab animals start showing adverse effects once exposure reaches a level around 85 decibels. At this threshold, the ears can incur damage that leads to hearing changes, such as temporary or permanent threshold shifts, and animals can also exhibit non-auditory responses like elevated stress hormones, altered behavior, and potential impacts on physiology, reproduction, and immune function. This 85 dB level is widely used as the benchmark in animal facilities and safety guidelines because it marks where adverse outcomes begin to appear, with greater risks as the level or duration increases. While higher levels (well above 85 dB) can produce effects more readily or more severely, 85 dB is the standard reference point for when auditory and non-auditory effects can start to occur.

Auditory systems and systemic stress in lab animals start showing adverse effects once exposure reaches a level around 85 decibels. At this threshold, the ears can incur damage that leads to hearing changes, such as temporary or permanent threshold shifts, and animals can also exhibit non-auditory responses like elevated stress hormones, altered behavior, and potential impacts on physiology, reproduction, and immune function. This 85 dB level is widely used as the benchmark in animal facilities and safety guidelines because it marks where adverse outcomes begin to appear, with greater risks as the level or duration increases. While higher levels (well above 85 dB) can produce effects more readily or more severely, 85 dB is the standard reference point for when auditory and non-auditory effects can start to occur.