Walking to School Could Reduce Stress Reactivity in Kids

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A simple morning walk to school could reduce stress reactivity in children during the school day, curbing increases in heart rate and blood pressure that can lead to cardiovascular disease later in life, according to a new University at Buffalo study.

UB researchers report in the August issue of Medicine & Science in Sports & Exercise that children who took a simulated walk to school later experienced smaller elevations in systolic blood pressure, heart rate and perceived stress while taking a short exam than children who had gotten a simulated ride to school.

Cardiovascular reactivity -- including changes in heart rate and blood pressure due to stress -- is associated with the beginnings of cardiovascular disease in children, and atherosclerosis -- the dangerous build-up of cholesterol, calcium, fat and other substances in artery walls -- in adults.

"The cardiovascular disease process begins in childhood, so if we can find some way of stopping or slowing that process, that would provide an important health benefit," says James Roemmich, UB associate professor of pediatrics and exercise and nutrition science and senior investigator on the study, which he completed with graduate students Maya Lambiase and Heather Barry. "We know that physical activity has a protective effect on the development of cardiovascular disease, and one way it may be doing so is by reducing stress reactivity."

Roemmich says because it’s not known how long the protective effect of a bout of exercise lasts, parents and educators should promote active play time throughout the day.

"If it only lasts a couple of hours, then it would be most beneficial if a child walked or biked to school, then had recess during school, as well as a break at lunch, so they had opportunities for physical activity throughout the day,” Roemmich says. “This would put them in a constantly protective state against stressors that they're incurring during the school day, whether that be taking an exam, trying to fit in with peers or speaking in front of classmates."

Roemmich says his study is the first to show that moderate-intensity exercise can reduce children’s cardiovascular reactivity during later, stressful activities. The research builds on his earlier work, which demonstrated that higher-intensity interval exercise could afford similar protection in children.

In the more recent investigation, Roemmich and his team examined a group of 20 boys and 20 girls, all Caucasian and ages 10-14. All visited the Behavioral Medicine Research Laboratory in the morning. To simulate a ride to school, half sat in a comfortable chair and watched a 10-minute slide show of images of a suburban neighborhood, ending with an image of a suburban school. The other half performed a one-mile walk on a treadmill at a self-selected pace, wearing a book bag containing 10 percent of their body weight. As they walked, the images of the suburban neighborhood were projected onto a screen.

Following a 20-minute rest period after completing the passive and active commutes, all children took a Stroop test, which asks subjects to correctly identify the color of color names printed in the wrong color (the word “green” printed in blue ink, for instance). On average, during this activity, heart rate increased by about three beats per minute in children who walked, compared with about 11 beats per minute in children who “rode” to school. Similarly, the rise in systolic blood pressure was more than three times higher, and the change in perceived stress about twice as high, for the passive commuters.

"The perception of a stressor as a threat is the beginning of the stress reactivity process, so if you can dampen that initial perception, then you reduce the magnitude of the fight-or-flight response," Roemmich says. "This results in lower heart rate and blood pressure responses to the stressor. Exercise helped dampen even the initial response."

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Research: College undergrads study ineffectively on computers

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Students transfer bad study habits from paper to screen

In the space of one generation, college students have gone from studying with highlighters and wire notebooks to laptops, netbooks and, now, iPads.

But despite the prevalence of technology on campuses, a new study indicates that computers alone can't keep students from falling into their same weak study habits from their ink-and-paper days.

"Our study showed that achievement really takes off when students are prompted to use more powerful strategies when studying computer materials," said the University of Nebraska-Lincoln's Ken Kiewra, an expert in study methods and one of the authors of the study.

The research, published this week in The Journal of Educational Psychology, found that students tend to study on computers as they would with traditional texts: They mindlessly over-copy long passages verbatim, take incomplete or linear notes, build lengthy outlines that make it difficult to connect related information, and rely on memory drills like re-reading text or recopying notes.

Meanwhile, undergraduates in the study scored 29 to 63 percentage points higher on tests when they used study techniques like recording complete notes, creating comparative charts, building associations, and crafting practice questions on their screens.

Kiewra, a professor of educational psychology, calls the method SOAR: Selecting key lesson ideas, organizing information with comparative charts and illustrations, associating ideas to create meaningful connections, and regulating learning through practice. It complements how the brain processes information, he said.

"Learning occurs best when important information is selected from less important ideas, when selected information is organized graphically, when associations are built among ideas and when understanding is regulated through self-testing," Kiewra said.

The study was built upon two experiments. In the first, undergraduates were questioned about how they study computer-based materials. In the second, they read an online text and then were asked to create on their computers some study materials that reflected their preferred (and likely weak) way to study. Or, they were prompted to use all or parts of SOAR study methods.

The latter group of studiers scored higher on tests measuring fact and relationship learning than the first group.

Kiewra authored the new study with former UNL graduate student Dharmananda Jairam, at Penn State University, and said the study shows that as undergraduates spend more and more study time on computers, it will be vital for them to learn better ways of processing and then making use of information.

Teachers and designers of instructional software may want to take note of the study's findings, as well.

"Teachers need to help students dispel crippling studying myths such as highlighting, outlining and rehearsal, and instead teach them strategies that help them succeed," Kiewra said.

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Students’ Understanding Of The Equal Sign Not Equal

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Taken very literally, not all students are created equal—especially in their math learning skills, say Texas A&M University researchers who have found that not fully understanding the “equal sign” in a math problem could be a key to why U.S. students underperform their peers from other countries in math.

“About 70 percent of middle grades students in the United States exhibit misconceptions, but nearly none of the international students in Korea and China have a misunderstanding about the equal sign, and Turkish students exhibited far less incidence of the misconception than the U.S. students,” note Robert M. Capraro and Mary Capraro of the Department of Teaching, Learning, and Culture at Texas A&M.



They have been trying to evaluate the success of math education through students’ interpretation of the equal sign. They have published several articles on this topic, with the most recent one published in the February 2010 issue of the journal Psychological Reports.

Students who exhibit the correct understanding of the equal sign show the greatest achievement in mathematics and persist in fields that require mathematics proficiency like engineering, according to their research.

“The equal sign is pervasive and fundamentally linked to mathematics from kindergarten through upper-level calculus,” Robert M. Capraro says. “The idea of symbols that convey relative meaning, such as the equal sign and “less than” and “greater than” signs, is complex and they serve as a precursor to ideas of variables, which also require the same level of abstract thinking.”

The problem is students memorize procedures without fully understanding the mathematics, he notes.

“Students who have learned to memorize symbols and who have a limited understanding of the equal sign will tend to solve problems such as 4+3+2=( )+2 by adding the numbers on the left, and placing it in the parentheses, then add those terms and create another equal sign with the new answer,” he explains. “So the work would look like 4+3+2=(9)+2=11.

“This response has been called a running equal sign—similar to how a calculator might work when the numbers and equal sign are entered as they appear in the sentence,” he explains. “However, this understanding is incorrect. The correct solution makes both sides equal. So the understanding should be 4+3+2=(7)+2. Now both sides of the equal sign equal 9.”

One cause of the problem might be the textbooks, the research shows.

The Texas A&M researchers examined textbooks in China and the United States and found “Chinese textbooks provided the best examples for students and that even the best U.S. textbooks, those sponsored by the National Science Foundation, were lacking relational examples about the equal sign.”

Parents and teachers can help the students. The two researchers suggest using mathematics manipulatives and encourage teachers “to read professional journals, become informed about the problem and modify their instruction.”

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