Internet could help encourage exercise

People who spend their days in front of a computer may want to check out some fitness-related Web sites, according to a study published Monday.

Researchers found that internet-based exercise programs worked as well as printed advice in getting sedentary adults to take up regular physical activity. One year into the study, the internet users were getting 80 to 90 minutes of exercise each week.

The findings are important, say the study authors, because they suggest that millions of sedentary Americans could be reached through one of the modern conveniences blamed for keeping them chair-bound.

In 2006, 147 million American adults were internet users," lead study author Dr. Bess H. Marcus said in a statement.

"If sedentary individuals are at least as likely as active individuals to use the internet, this means roughly 80 million under-active adults are online and might be reached via Web-based interventions," said Marcus, a professor of psychiatry and human behavior at Brown University Medical School in Providence, Rhode Island.

She and her colleagues report their findings in the current issue of the Archives of Internal Medicine.

The study included 249 sedentary adults who were randomly assigned to one of three groups. One group used a Web site developed by the researchers to support participants" exercise efforts. A second group was provided with links to six Web sites run by professional medical and fitness organizations. The third group received printed materials by mail.

Participants in all of the groups kept daily activity logs and completed questionnaires designed to keep them on track with their exercise regimens. The difference was that the group using the specially tailored Web site got immediate email feedback.

One year later, all three groups were doing similarly well, Marcus and her colleagues found. Those who used the tailored Web site were getting an average of 90 minutes of exercise per week, as were men and women in the group that received help by mail.

Study participants who used a Web site program they picked out were getting 80 minutes of exercise per week, on average.

In general, experts recommend that adults get at least 30 minutes of moderate exercise, such as brisk walking, on most days of the week.

According to Marcus"s team, more studies should investigate the power of the internet to reach the legions of inactive Americans sitting in front of a computer screen.

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Wireless Energy Transfer Possible

Internet could help encourage exercise

Wireless Energy Transfer Possible

US researchers have developed a wireless energy transfer technology that could charge a computer or cell-phone battery from across a room.

Massachusetts Institute of technology scientists said their innovation may soon eliminate wires that tether our machines to wall sockets, or may keep batteries topped up and ready to go.

They made a 60-watt light bulb glow by sending it energy wirelessly -- from a device two meters (7 feet) away.

The fledgling "WiTricity" technology is potentially heralding a future in which cell phones and other gadgets get juice without having to be plugged in.

Six MIT researchers worked four years on the problem.

The technology has already piqued the interest of some big names in consumer electronics.

Venture capitalists have been lining up with offers for the researchers who are now figuring how to turn their pet project into a marketable commodity.

Aristeidis Karalis, a member of the team Said, "This invention could free us from power cables and ideally replace batteries to a good extent, at least in the context of a home or office setting."

Marin Soljacic, a professor of physics at MIT in Cambridge, Massachusetts who led the six-person research team explained the technology is simple.

It is based on resonance, which causes an object to vibrate when energy of a certain frequency is applied to it, he said.