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Noise health effects are the physical and psychological health consequences of regular exposure to consistent elevated sound levels. Noise from traffic, in particular, is considered by the World Health Organization to be one of the worst environmental stressors for humans, second only to air pollution. [2]
Noise pollution, or sound pollution, is the propagation of noise or sound with potential harmful effects on humans and animals. The source of outdoor noise worldwide is mainly caused by machines, transport and propagation systems.
The report "A Review of Published Research on Low Frequency Noise and its Effects" [55] contains a long list of research about exposure to high-level infrasound among humans and animals. For instance, in 1972, Borredon exposed 42 young men to tones at 7.5 Hz at 130 dB for 50 minutes.
This "protective effect" had long been thought to involve the active mechanisms of the outer hair cells and the efferent system commanding them. [80] The contractile effect of the outer hair cells, activated by the efferent nervous system has been proven to provide a protective effect against acoustic trauma. [119] Cross-section of the cochlea.
Within this context, environmental noise is generally present in some form in all areas of human, animal, or environmental activity. The effects in humans of exposure to environmental noise may vary from emotional to physiological and psychological. [2] Noise at low levels is not necessarily harmful.
In subsequent years, the AHAAH underwent several validation tests, including The Albuquerque Studies, which was one of the largest early studies of human impulse noise exposure and led to the creation of a large systematic database that documented the effects of impulse noise on humans.
The combined effects of styrene and noise exposure shows damages to all three rows instead, reinforcing previous results. [10] Also, the combined effects of these chemicals and the noise produce greater auditory fatigue than when an individual is exposed to one factor immediately followed by the next. [10]
Lin et al., conducted an experiment in Taiwan that tested the effect of generation of reactive oxygen species on temporary threshold shift and noise-induced hearing loss. [11] [12] Subjects were employees at a steel manufacturing company and each one was assessed for personal noise exposure during work shifts. Statistical analysis yielded a ...