Science and Medicine

More Than a Sign of Sleepiness, Yawning May Cool the Brain

Nearly half of the people in the winter session yawned, as opposed to less than a quarter of summer participants.

Though considered a mark of boredom or fatigue, yawning might also be a trait of the hot-headed. Literally.

A study led by Andrew Gallup, a postdoctoral research associate in Princeton University’s Department of Ecology and Evolutionary Biology, is the first involving humans to show that yawning frequency varies with the season and that people are less likely to yawn when the heat outdoors exceeds body temperature. Gallup and his co-author Omar Eldakar, a postdoctoral fellow in the University of Arizona’s Center for Insect Science, report this month in the journal Frontiers in Evolutionary Neuroscience that this seasonal disparity indicates that yawning could serve as a method for regulating brain temperature.

Gallup and Eldakar documented the yawning frequency of 160 people in the winter and summer in Tucson, Arizona, with 80 people for each season. They found that participants were more likely to yawn in the winter, as opposed to the summer when ambient temperatures were equal to or exceeding body temperature. The researchers concluded that warmer temperatures provide no relief for overheated brains, which, according to the thermoregulatory theory of yawning, stay cool via a heat exchange with the air drawn in during a yawn.

Gallup describes the findings as follows: “This provides additional support for the view that the mechanisms controlling the expression of yawning are involved in thermoregulatory physiology. Despite numerous theories posited in the past few decades, very little experimental research has been done to uncover the biological function of yawning, and there is still no consensus about its purpose among the dozen or so researchers studying the topic today.

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Lower Income Raises Heart Disease Risk

“Low socioeconomic status is a heart-disease risk factor on its own and needs to be regarded as such by the medical community,” Franks said.

People with less education and lower incomes are much more likely to develop heart disease than those who are wealthier or better educated, according to a recent study.

Reported in the journal BMC Cardiovascular Disorders, the outcomes also show the risk persists even with long-term progress in addressing traditional risk factors such as smoking, high blood pressure, and elevated cholesterol.

“Being poor or having less than a high school education can be regarded as an extra risk when assessing a patient’s chances of developing cardiovascular disease,” said lead researcher Peter Franks, a professor of family and community medicine at the University of California, Davis. “People with low socioeconomic status need to have their heart-disease indicators managed more aggressively.”

Using data from the Atherosclerosis Risk in Communities Study, authors of the current study included information on more than 12,000 people aged 45 to 64 years living in North Carolina, Mississippi, Minnesota, and Maryland. Participants reported their education and income levels in 1987, and then over the course of 10 years were periodically evaluated for heart-disease diagnoses and changes in their risk factors, including cholesterol, blood pressure, and smoking.

The results indicated that people with lower socioeconomic status had a 50 percent greater risk of developing heart disease than other study participants.

According to Franks, although it is known that people with low socioeconomic status have a greater risk for developing heart disease and other health problems, the reason is often attributed to reduced health-care access or poor adherence to treatments such as smoking cessation or medication.

This study showed for the first time that the increased risk endured despite long-term improvements in other risk factors, indicating that access and adherence could not account for the differences.

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Rain from Hurricane Irene Reaches East Coast

The hurricane would be the strongest to strike the East Coast in seven years, and people were already getting out of the way.

NAGS HEAD, N.C.—Hurricane Irene began lashing the East Coast with rain Friday ahead of a weekend of violent weather that was almost certain to heap punishment on a vast stretch of shoreline from the Carolinas to Massachusetts.

For hundreds of miles, people in the storm’s path headed inland, made last-minute preparations and monitored the hurricane’s every subtle movement. Irene had the potential to cause billions of dollars in damage all along a densely populated arc that included Washington, Baltimore, Philadelphia, New York, Boston and beyond. At least 65 million people were in its projected track.

As the storm trudged toward northwest from the Bahamas, rain from its outer bands began falling along the North and South Carolina coast. Swells and 6- to 9-foot waves were reported along the Outer Banks. Winds were expected to pick up later. Thousands had already lost power as the fringes of the storm began raking the shore.

Forecasters expanded the hurricane warning area, which extended from North Carolina to Sandy Hook, N.J., south of New York City. A hurricane watch was in effect even farther north and included Long Island, Martha’s Vineyard and Nantucket, Mass.

Risks from Irene’s wrath were many: surging seas, drenching rains, flash floods and high winds.

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