Noise or loud music cause hearing damage exposed individuals whether it be for those who are exposed to it at work or at leisure. Less known what effects exposure to pregnant women may have excessive noise, and what kind of consequences might be for the child.
In the womb the child is somewhat protected muscle tissue and fluid-fertile water, but the inner ear is still developing, all the structures are very delicate and sensitive than adults. For normal listening (or run) for example. disco music, or work in an environment where the noise above 80 dB such intense sounds are transmitted to the structure of the fetal ear.
To help us understand the risk to the baby, we describe briefly the changes that occur in adults. In adults it takes 16 hours to rest your ears from the noise measuring 100 decibels as usual "shake" in the disco club.Hours after exposure to such noise people hear ringing in your ears, ringing, etc.. or feel fullness in the ear.If the noise persists, the damage can become hard and turn into a recoverable deafness. In children and teenagers sensitivity hearing aid is even greater, and one in five young people has deteriorated hearing, which is three times more than the 80-ies when listening to loud music into practice.
That is why in most European countries introduced legislation about the volume of music in the nightclubs.In our research was conducted at the younger generation, the 1998th and 1999. on a sample of 12,000 healthy subjects and showed that at the age of 16 to 20 years 11% of them have hearing loss as a result of using electroacoustic devices, firecrackers, rockets, and various firearms. in recent times, and this contributes to listen to MP3 or MP4 "player." This problem is acute among professional musicians, especially those in symphony orchestras, brass band music and rock bands. All the music they produce about 100 decibels and some 110 dB. Hearing impairment in first place in the area of high tones and the person was not aware of at the beginning (eg high tones, etc..). It is also well-known that exposure to noise and / or music too loud so encouraged. autonomic nervous system, which may increase the long-term blood pressure and lead to heart disease. In addition, a source of tension and mental stress.
Pregnant women are often worried whether her baby will have all fingers, normally developed organs, whether good to see and hear. Thinking about diet and avoiding what could harm unborn child. Very rarely wonder whether too much noise degrades the development of hearing. According to the results of animal studies following exposure during pregnancy have been observed changes in the cell structure of the cochlea, the most complex part of the inner ear sensory. This reflects the loss of hearing in the lower tones.Follow-up studies of infants and children whose mothers were exposed to noise during pregnancy (use of firearms, noisy machines at work, etc..) Show that a significantly larger number of children with hearing impairment in this group than in those not exposed to noise. It was concluded that longer exposure to noise of 100 dB or more causes of hearing loss newborn. The study on 131 children aged 4-10 years (Quebec), showed that three times the risk of hearing loss in those whose mothers were exposed during pregnancy to noise of 85-95 dB.
Health and labor laws in some states of the U.S. and many developed countries of Europe bans women during pregnancy noise exposure in the work environment (80 dB continuous sound and / or rapid pulse noises of 40 dB). While it is relatively easy to implement this law in the industry, women employed in jobs disco performers or other very loud music tend to be limited, and their exposure to sound well above 80 dB, as stated earlier is often between 110-120 dB.
According to a study on 111 pregnant women exposed to noise at work, and 181 of those with similar conditions but without the noise turned out to be exposed to noise were more infants with low birth weight (taking into account whether they were born before the scheduled date).