Climate Change Could Be Tough on Seniors' Health:
MONDAY, April 9 (HealthDay News) -- Even small swings in
temperatures could put elderly people with chronic illnesses such
as diabetes, heart failure and lung disease at greater risk of
death throughout the coming summer, a new study indicates.
Researchers from the Harvard School of Public Health in Boston
found temperature fluctuations related to climate change could
claim thousands of lives every year.
Experts predict climate change could increase variations in
summer temperatures, particularly in the mid-Atlantic states and in
parts of France, Spain and Italy. In these more volatile regions,
this could pose a serious public health risk, the study authors
"The effect of temperature patterns on long-term mortality has not been clear to this point. We found that, independent of heat waves, high day-to-day variability in summer temperatures shortens life expectancy," study author Antonella Zanobetti, a senior research scientist in the department of environmental health at Harvard, said in a news release from the university. "This variability can be harmful for susceptible people."
Using Medicare data from 1985 to 2006, the researchers tracked
the long-term health of 3.7 million chronically ill people older
than 65 living in 135 American cities. After considering each
person's individual risk factors, they determined if any of these
people died due to variability in summer temperature.
The study, published in the April 9 online edition of the
Proceedings of the National Academy of Sciences, revealed that years with larger summer temperature swings had higher death rates than those with smaller swings. This was true for each city examined.
The researchers also noted each one-degree Centigrade increase
(about 1.8 degrees Fahrenheit) in summer temperature variability
increased the death rate for elderly with chronic conditions by
between 2.8 percent and 4 percent.
More specifically, the mortality risk for those with diabetes
increased 4 percent. It also rose 3.8 percent for people who had
suffered a previous heart attack, 3.7 percent for those with
chronic lung disease and 2.8 percent for people with heart
The temperature-related death risk was 1 percent to 2 percent
higher for black people as well as those living in poverty, the
study noted. The risk of death was also higher for the elderly
people living in hotter areas.
Based on these findings, the researchers estimated that greater
summer temperature variability in the United States could result in
more than 10,000 additional deaths every year.
"People adapt to the usual temperature in their city. That is why we don't expect higher mortality rates in Miami than in Minneapolis, despite the higher temperatures," study senior author Joel Schwartz, a professor of environmental epidemiology at Harvard, explained in the news release.
"But people do not adapt as well to increased fluctuations around the usual temperature. That finding, combined with the increasing age of the population, the increasing prevalence of chronic conditions such as diabetes and possible increases in temperature fluctuations due to climate change, means that this public health problem is likely to grow in importance in the future," Schwartz added.
The U.S. Centers for Disease Control and Prevention has more
heat stress and the elderly.
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