TUESDAY, Oct. 5 (HealthDay News) -- Persistent, loud noise in
the workplace more than doubles the risk for heart disease,
Canadian researchers say.
Among those at highest risk are younger men who smoke, which by
itself is a risk factor for heart disease, the study authors
"Excess noise exposure in the workplace is an important occupational health issue, especially for younger workers," said lead researcher Dr. Wen Qi Gan, from the School of Environmental Health at the University of British Columbia in Vancouver.
Persistent loud noise does not mean loud music or talking, Gan
added, but rather any unwanted sound. In this study, noise was
defined as industrial noise, such as noise in mining, lumbering and
wood product manufacturing, Gan said.
"Noise control is critical to prevent these noise-related diseases. Whenever possible, protect yourself from exposure to excess noise," he advised.
The report is published in the Oct. 6 online edition of
Occupational and Environmental Medicine.
For the study, Gan's group collected data on 6,307 people aged
20 and older who took part in the U.S. National Health and
Nutrition Examination Survey between 1999 and 2004.
The participants were asked about their lifestyle and
occupational health and other health-related topics, and underwent
physical exams and blood tests.
The researchers divided the workers by the type of workplace
they had: those who said they put up with persistent loud noise
(making it difficult to talk at a normal level) for at least three
months, and those whose workplace was relatively quiet.
Gan's team found that 21 percent of the individuals said their
workplace was noisy almost all the time over a nine-month period.
Most of them were men with an average age of 40. Compared with
those who worked in a quiet environment, this group tended to be
overweight and to smoke, which are risk factors on their own for
But even after taking those risk factors and others into
account, workers bombarded by a noisy environment were two to three
times more likely to have serious heart problems than their
counterparts in quiet workplaces, the researchers found.
The association between a noisy work environment and heart
disease was particularly strong in those under 50 years of age, who
were three to four times more likely to have angina or coronary
artery disease or to have had a heart attack, Gan's team noted. Men
and smokers in this age group were also at higher risk.
Blood tests of these at-risk workers did not show particularly
high levels of cholesterol or inflammatory proteins, both of which
are linked to heart disease. However, diastolic blood pressure --
the second number in a blood pressure reading -- was higher than
normal, a condition linked to serious heart problems, the
researchers pointed out.
In fact, those exposed to loud noise at work were twice as
likely to have a higher-than-normal diastolic blood pressure, a
phenomenon known as isolated diastolic hypertension, the
The study was limited in that heart disease was based on
self-reports of a doctor's diagnosis. Also, the research did not
take into account other occupational factors associated with
cardiovascular disease, such as shift work and air pollution, Gan's
team noted, adding that more studies on the issue are needed.
The authors speculated that stress caused by loud noise could
resemble that sparked by sudden, strong emotion, which over time
can lead chemical messengers to constrict blood flow through the
Dr. William W. O'Neill, executive dean for clinical affairs at
the University of Miami Miller School of Medicine and an
interventional cardiologist, said with epidemiological studies, one
cannot be certain of a cause-and-effect relationship -- in this
case, between a noisy workplace and heart disease.
But "intuitively it makes sense," he said. "It fits with the
idea that stress is bad for your cardiovascular health."
Although the connection between noise and heart disease has not
been proven, working in unpleasant conditions and the stress it
produces can be bad for your heart, O'Neill said.
"If your work environment is really unpleasant, then in the long-term it's really bad for your cardiovascular system," he said.
For more information on heart disease, visit the
American Heart Association.
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