InfoAnda - Fight against fat goes high-tech with new devices

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Yahoo! My Yahoo! Mail More Yahoo! Services Account Options New User? Sign Up Sign In Help Yahoo! Search web search Home Singapore Asia Pacific World Business Entertainment Sports Technology Africa Europe Latin America Middle East North America Fight against fat goes high-tech with new devices By ALICIA CHANG,AP Science Writer - Thursday, January 7 Send IM Story Print ALHAMBRA, Calif. – The fight against fat is going high-tech. To get an inside look at eating and exercise habits, scientists are developing wearable wireless sensors to monitor overweight and obese people as they go about their daily lives. The experimental devices are designed to keep track of how many minutes they work out, how much food they consume and even whether they are at a fast-food joint when they should be in the park. The goal is to cut down on self-reported answers that often cover up what's really happening. In a lab in this Los Angeles suburb, two overweight teenagers help test the devices by taking turns sitting, standing, lying down, running on a treadmill and playing Wii. As music thumps in the background, wireless sensors on their chests record their heart rates, stress levels and amount of physical activity. The information is sent to a cell phone. "I can't feel my legs," 15-year-old Amorette Castillo groans after her second treadmill run. Traditional weight-loss interventions rely mainly on people's memory of what they ate for dinner and how many minutes they worked out. But researchers have long known that method can be unreliable since people often forget details or lie. The new devices are being designed in labs or created with off-the-shelf parts. Some similar instruments are already on the market, including a model that tracks calories burned by measuring motion, sweat and heat with armbands. But the devices in development aim to be more sophisticated by featuring more precise electronics and sometimes even video cameras. Many emerging systems also strive to provide instant feedback and personalized treatment for wearers. At the University of Southern California lab, the teens alternated between being sedentary and active as researchers resolved the technical bugs. Later this year, some will wear the body sensors at home on weekends. If they get too lazy, they will get pinged with a text message. "We'll be able to know real-time if they're inactive, if they're active," said Donna Spruijt-Metz, a USC child obesity expert in charge of the project. The devices are made possible by advances in technology such as accelerometers that can measure the duration and intensity of a workout. They also use Bluetooth-enabled cell phones that can take pictures of meals and send information back. Will all this wizardry lead to a slimmer society? Scientists say there's reason to hope. Getting an accurate picture of what people eat and how often they move around will help researchers develop personalized weight-loss advice. Obesity is epidemic in the United States with two-thirds of adults either overweight or obese. It's a major health concern for children and adolescents, who are at higher risk for high blood pressure, high cholesterol and diabetes as they grow older. A federally funded pilot project by the Pennington Biomedical Research Center in Louisiana is exploring whether people can lose more weight when tracked by technology. Participants carry around Blackberry Curves to snap pictures of their meals and leftovers. They also wear a quarter-sized device on their shoe that counts the number of steps they take. Counselors pore over the incoming data and give individually tailored health advice through e-mail or telephone. Every month, the participants get their weight checked, and their progress is compared against a separate group that receives only generic health tips. The study involves just seven people, but researchers eventually hope to have 40. "It's highly personalized. You get feedback very quickly," said Corby Martin, who heads Pennington's Ingestive Behavior Laboratory. By using technology to capture eating and exercise details, researchers hope to bypass self-reporting that can sometimes give an incomplete picture. But some medical experts are concerned about ethical questions. Even if people agree to be tracked, researchers worry about intruding into the rest of their lives and the lives of those around them. "As a researcher, I'm a professional voyeur, and I like to find out whatever I can about human subjects," said William McCarthy, a professor of public health and psychology at the University of California, Los Angeles. "But if I were a subject, I'd be concerned about the level of detail that's being captured about my behavior from moment to moment." University of Pittsburgh engineer Mingui Sun has developed a necklace equipped with a video camera that records where a person goes and what he or she eats. Before a researcher sees the data, it's filtered by a computer that blurs out other people's faces. The device is not smart enough to know whether the wearer ate a Big Mac or tofu. So a researcher inputs the food, and the computer calculates the portion size, calories and nutrients. Sun's lab workers are wearing the prototype, and he hopes to test it on real people by the middle of the year. Another concern is whether people, particularly youngsters, will stick with it. Fellow Pittsburgh researcher Dana Rofey recently completed a study of 20 overweight female preteens and teens who wore armbands tracking the number of steps taken and calories burned daily. Researchers found the armbands were worn 75 percent of the time. Though the study did not include a comparison group, researchers were pleased with the high compliance rate. On a recent weekday, Castillo and another study volunteer, 13-year-old Eric Carles, headed straight from school to the USC lab, where they strapped the sensors on and went through a sort of circuit training. The project manager timed them as a postdoctoral student recorded the session through a one-way mirror. Through periods of sitting, standing and exercising, they chatted about scary movies and upcoming exams. Wearing the devices felt "weird" to Castillo initially, but she has since grown used to it. Castillo admits she doesn't exercise as she often as she would like and has a sweet tooth for chocolate. Carles, who plays after-school sports, confesses he eats a lot. The teens were willing to try anything to help them lose weight. After enduring more than two hours of required physical activity, the two were allowed to do whatever they want. Researchers called it "free living," and it offered a glimpse into the activities teens would choose when they test the sensors at home. The two chose to play a music video game. With Castillo on drums and Carles on the guitar, they rocked out to Duran Duran and Bon Jovi as researchers looked on. 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