Over Head Noise
Over Head Noise
Noise and Its Affect on Your Health
Noise is a nuisance; there is no doubt about it. But more than that, it can cause health problems. For this reason, many are working at reducing the amount of noise in our everyday environment by creating new laws and regulations.
How does noise affect our health? The first and most noticeable affects are hearing loss. Hearing loss is easy to connect with noise because it is observable and measurable.
Hearing loss is often gradual and the first awareness of the damage unfortunately comes once it has started. One first notices hearing loss when they are unable to hear particular words during conversation and then speech on a telephone. Unfortunately, this recognition comes too late to recover what is lost. By then, the ability to hear the high frequency sounds of, for example, a flute or piccolo or even the soft rustling of leaves will have been permanently diminished. As hearing damage continues, it can become quite significant and handicapping. And there is no cure. Hearing aids do not restore noise-damaged hearing, although they can be of limited help to some people.
People with partial deafness from exposure to noise do not necessarily live in a quieter world. The many sounds still audible to them are distorted in loudness, pitch, apparent location, or clarity. Consonants of speech, especially high frequency sounds such as “s” and “ch,” are often lost or indistinguishable from other sounds. Speech frequently seems garbled, sounding as if the speaker has his or her “head in a barrel.” When exposed to a very loud noise, people with partial hearing loss may experience discomfort and pain. They also frequently suffer from tinnitus -irritating ringing or roaring in the head.
There is even further pain the hard-of-hearing person faces: the emotional anguish caused, perhaps Unintentionally, by friends and associates who become less willing to be partners in conversation or companions in other activities.
Noise also affects our bodies subconsciously. In readiness for dangerous and harmful situations, our bodies make automatic and unconscious responses to sudden or loud sounds. Of course, most noise in our modern society does not signify such danger. However, our bodies still react as if these sounds were always a threat or warning.
In effect, the body shifts gears. Blood pressure rises, heart rate and breathing speed up, muscles tense, hormones are released into the bloodstream, and perspiration appears. These changes occur even during sleep.
The idea that people get used to noise is a myth. Even when we think we have become accustomed to noise, biological changes still take place inside us, preparing us for physical activity if necessary.
Noise does not have to be loud to bring on these responses. Noise below the levels usually associated with hearing damage can cause regular and predictable changes in the body.
In studies dating back to the 1930s, researchers noted that noise developed marked digestive changes which were thought to lead to ulcers. Cases of ulcers in certain noisy industries have been found to be up to five times as numerous as what normally would be expected.
Similar research has identified more clearly the contribution of noise to other physical disorders. A five-year study of two manufacturing firms in the United States found that workers in noisy plant areas showed greater numbers of diagnosed medical problems, including respiratory ailments, than did workers in quieter areas of the plants.
From a study done with animals, researchers concluded that noise may be a risk factor in lowering people’s resistance to disease and infection.
To prevent aggravation of existing disease, doctors and health researchers agree that there is an absolute requirement for rest and relaxation at regular intervals to maintain adequate mental and physical health.
Sleep is a restorative time of life, and a good night’s sleep is probably crucial to good health. But everyday experience suggests that noise interferes with our sleep – in a number of ways. Noise can make it difficult to fall asleep, it can wake us, and it can cause shifts from deeper to lighter sleep stages. If the noise interference with sleep becomes a chronic problem, it may take its toll on health.
Human response to noise before and during sleep varies widely among age groups. The elderly and the sick are particularly sensitive to disruptive noise. Compared to young people, the elderly are more easily awakened by noise and, once awake, have more difficulty returning to sleep. As a group, the elderly require special protection from the noises that interfere with their sleep.
Other age groups seem to be less affected by noise at bedtime and while asleep. But their apparent adjustment may simply be the result of failing to remember having awakened during the night. Sleep researchers have observed that their subjects often forget and underestimate the number of times they awaken during sleep. It may be that loud noises during the night continue to wake or rouse us when we sleep, but that as we become familiar with the sounds, we return to sleep more rapidly.
The most obvious price we pay for living in an overly noisy world is the annoyance we frequently experience. Perhaps because annoyance is so commonplace, we tend to take our daily doses of it for granted – not realizing that the irritability that sometimes surfaces can be a symptom of potentially more serious distress inside us. When noise becomes sufficiently loud or unpredictable, or if the stress imposed is great enough, our initial annoyance can become transformed into more extreme emotional responses and behavior. When this happens, our tempers flare and we may “fly off the handle” at the slightest provocation.
Indeed, noise can strain relations between individuals, cause people to be less tolerant of frustration and ambiguity, and make people less willing to help others. Although no one would say that noise by itself brings on mental illness, there is evidence that noise-related stress can aggravate already existing emotional disorders.
Is noise a problem? It seems it is one we often don’t recognize. Fortunately it is also one that can be remedied with the proper treatment of your home or work place with soundproofing. As for recreation, maybe a trip out into the country will be the ticket there.
About the Author
About the Author: Mark Rustad is President of NetWell Noise Control, based in Minneapolis, MN. Founded in 1991, NetWell is a leading supplier of acoustic products, wall sound proofing treatments, and online acoustical consulting services. NetWell’s sound management skills are packaged into the industry’s premier website. Discover first hand why so much of NetWell’s business stems from the referrals and repeat orders they receive from satisfied clients around the world.
Over Head Noise
Australian Railways 
assenger, freight and some overhead noise
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