Meteorite Fragments Are Said to Rain Down on Siberia; 400 Injuries Reported

MOSCOW – A shower of falling objects, tentatively identified as fragments of a meteorite, was reported in Siberia early on Friday, damaging buildings across a vast swath of territory. More than 400 people were reported to have been injured, most from breaking glass.

But four hours after the objects fell to earth, emergency officials had reported no deaths.

Yelena Smirnykh, a spokeswoman for the Ministry of Emergency Situations, told Ekho Moskvy radio that she believed the meteorite broke apart and fell in several places. Another government expert, who spoke to Moscow FM radio station, said he believed it may have been a bolide, a type of fireball meteor that explodes in the earth’s atmosphere because of its composition or angle of entry and can be observed from the ground.

However, the governor of the Ural region reported that a search team had found an impact crater on the outskirts of a city about 50 miles west of Chelyabinsk, which would indicate the meteor did not explode in the atmosphere. Several fragments were also reported to have hit the earth around the city of Satka.

Dozens of amateur videos of the event were broadcast on Friday morning. They showed bright objects streaking through a clear morning sky, leaving a thick trail of white vapor.

Video clips from the city of Chelyabinsk showed an early morning sky illuminated by a brilliant flash, followed by the sound of breaking glass and multiple car alarms apparently triggered by the impact, which was powerful enough to shatter dishes and televisions inside people’s homes.

Dozens of amateur videos of the event were broadcast on Friday morning. They showed bright objects streaking through a clear morning sky, leaving a thick trail of white vapor.

“I saw a flash in the window, turned toward it and saw a burning cloud, which was surrounded by smoke and was going downward – it reminded me of what you see after an explosion,” said Maria Polyakova, 25, head of reception at the Park-City Hotel in Chelyabinsk.

She said the explosion occurred shortly thereafter, shattering the thick glass doors on the hotel’s first floor. She said the hotel was evacuated, but that there was no panic. Emergency officials in Chelyabinsk reported that at least four people were injured by broken glass at a school, according to the Interfax news agency. Authorities said windows facing the point of impact broke throughout the city.

“Now we have many calls about trauma, cuts and bruises,” Igor Murog, a deputy governor of the Ural region, told Interfax.

A video made outside a building in Chelyabinsk captured a blast strong enough to break windows far from the point of impact and the astonished voices of witnesses who were uncertain what it was they had just seen.

“Maybe it was a rocket,” said one man, who rushed outside onto the street along with his co-workers when the object hit, far out of sight. A man named Artyom, who spoke to the Moscow FM radio station, said the explosion was enormous.

“I was sitting at work and the windows lit up and it was as if the whole city was illuminated, and I looked out and saw a huge streak in the sky and it was like that for two or three minutes and then I heard these noises, like claps,” he said. “And then all the dogs started barking.”

On impact, he said balconies shook and windows shattered. He said he did not believe it was a meteorite. “We are waiting for a second piece, that is what people are talking about now,” he said.

There were reports that falling objects were visible as far away as Yekaterinburg, 125 miles southeast of Chelyabinsk. A police official told Interfax that authorities had identified one meteorite’s point of impact, in a sparsely populated area around 50 miles outside the city of Satka.

Siberia stretches the length of Asia and there is a history of meteor and asteroid showers there. In 1908 a powerful explosion was reported near the Tunguska River in central Siberia, its impact so great that trees were flattened for 25 miles around. Generations of scientists have studied that event, analyzing particles that were driven into the earth’s surface as far away as the South Pole. A study published in the 1980s concluded the object weighed a million tons.

Viktor Klimenko contributed reporting.

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Japanese Economy Contracts and Remains in Recession

TOKYO (AP) — Japan’s economy remained mired in recession late last year, shrinking 0.4 percent in annualized terms for the third straight quarter of contraction on feeble demand at home and overseas.

The government reported Thursday that growth for all of 2012 was 1.9 percent, after a 0.6 percent contraction in 2011 and a 4.7 percent increase in 2010 and a 5.5 percent contraction in 2009.

The figures were worse than expected, as many analysts had forecast the economy may have emerged from recession late last year as the Japanese yen weakened against other major currencies, giving a boost to Japanese export manufacturers.

Prime Minister Shinzo Abe, who took office in late December, is championing aggressive spending and monetary stimulus to help get growth back on track. He has lobbied the central bank to set an inflation target of 2 percent, aimed at breaking out of Japan’s long bout of deflation, or falling prices, that he says are inhibiting corporate investment and growth.

But the Bank of Japan was not expected to announce any major new initiatives from a policy meeting on Thursday. The current central bank governor, Masaaki Shirakawa, is due to leave office on March 19, and Mr. Abe is expected to appoint as his successor an expert who favors his more activist approach to monetary policy.

Last year began on an upbeat note with annual growth in the first quarter at 6 percent as strong government spending on reconstruction from the March 2011 tsunami disaster helped spur demand. But the economy contracted in the second quarter and deteriorated further as frictions with China over a territorial dispute hurt exports to one of Japan’s largest overseas markets.

Despite the dismal data for last year, many in Japan expect at least a temporary bump to growth from higher government spending on public works and other programs. An index measuring consumer confidence, released this week, jumped to its highest level since 2007, the biggest increase in a single month.

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Use of Morning-After Pill Is Rising, Report Says

The use of morning-after pills by American women has more than doubled in recent years, driven largely by rising rates of use among women in their early 20s, according to new federal data released Thursday.

The finding is likely to add to the public debate over rules issued by the Obama administration under the new health care law that require most employers to provide free coverage of birth control, including morning-after pills, to female employees. Some religious institutions and some employers have objected to the requirement and filed lawsuits to block its enforcement.

Morning-after pills, which help prevent pregnancy after sex, were used by 11 percent of sexually active women from 2006 to 2010, the period of the study. That was up from just 4 percent in 2002. Nearly one in four women between the ages of 20 and 24 who had ever had sex have used the pill at some point, the data show.

Morning-after pills are particularly controversial among some conservative groups who contend they can cause abortions by interfering with the implantation of a fertilized egg that the groups regard as a person.

Medical experts say that portrayal is inaccurate, and that studies provide strong evidence that the most commonly used pills do not hinder implantation, but work by delaying or preventing ovulation so that an egg is never fertilized in the first place, or thicken cervical mucus so sperm have trouble moving.

This month, the Obama administration offered a proposal that could expand the number of groups that do not need to provide or pay for birth control coverage. But the proposal did not end the political fight over the issue, which legal experts say may end up in the Supreme Court.

The new data was released by the National Center for Health Statistics and based on interviews with more than 12,000 women from 2006 to 2010. Researchers asked sexually active women if they had ever used emergency contraception, “also known as Plan B, Preven or morning-after pills,” as well as about their use of other forms of birth control.

Over all, 99 percent of sexually active women ages 15 to 44 have used contraception at some point in their lives, or about 53 million women, up slightly from 2002. An earlier report found that 62 percent of all women of reproductive age were currently using some form of birth control.

The new report found that 98.6 percent of sexually active Catholic women had used contraception at some point, but the data did not show how many Catholic women currently use contraception.

Condom use has risen markedly. More than 93 percent of women said they had partners who had used condoms at some point, compared with 82 percent of women in 1995, a likely effect of strong public advocacy for condom use during the AIDS epidemic.

In contrast, women who had used intrauterine devices, or IUDs, at some point in their lives declined to about 8 percent from 10 percent in 1995. The use of birth control pills has remained steady since 1995 at 82 percent.

Eighty-nine percent of white women said they had used birth control pills at some point, compared with 67 percent of Hispanic women, 78 percent of black women and 57 percent of Asian women.

Education played a role in the type of contraception used. Forty percent of women without a high school diploma said they chose sterilization, while just 10 percent of women with a bachelor’s degree said they used that method. Those without a high school diploma were also far more likely to use three-month injectables, like Depo-Provera — 36 percent compared with 13 percent of women with a college degree.

About 12 percent of college graduates said they had used emergency contraception, while 7 percent of women with only a high school degree said they had used it.

Educated women were far more likely to have practiced periodic abstinence based on the menstrual cycle. About 28 percent of women with a master’s degree or higher had practiced this method, while just 13 percent of women without a high school diploma had, the report found.

White women, American-born Hispanic women and black women were most likely to practice withdrawal, with more than half of women in each group saying they have used that method. Just 44 percent of foreign-born Hispanics said they practiced withdrawal.

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Use of Morning-After Pill Is Rising, Report Says

The use of morning-after pills by American women has more than doubled in recent years, driven largely by rising rates of use among women in their early 20s, according to new federal data released Thursday.

The finding is likely to add to the public debate over rules issued by the Obama administration under the new health care law that require most employers to provide free coverage of birth control, including morning-after pills, to female employees. Some religious institutions and some employers have objected to the requirement and filed lawsuits to block its enforcement.

Morning-after pills, which help prevent pregnancy after sex, were used by 11 percent of sexually active women from 2006 to 2010, the period of the study. That was up from just 4 percent in 2002. Nearly one in four women between the ages of 20 and 24 who had ever had sex have used the pill at some point, the data show.

Morning-after pills are particularly controversial among some conservative groups who contend they can cause abortions by interfering with the implantation of a fertilized egg that the groups regard as a person.

Medical experts say that portrayal is inaccurate, and that studies provide strong evidence that the most commonly used pills do not hinder implantation, but work by delaying or preventing ovulation so that an egg is never fertilized in the first place, or thicken cervical mucus so sperm have trouble moving.

This month, the Obama administration offered a proposal that could expand the number of groups that do not need to provide or pay for birth control coverage. But the proposal did not end the political fight over the issue, which legal experts say may end up in the Supreme Court.

The new data was released by the National Center for Health Statistics and based on interviews with more than 12,000 women from 2006 to 2010. Researchers asked sexually active women if they had ever used emergency contraception, “also known as Plan B, Preven or morning-after pills,” as well as about their use of other forms of birth control.

Over all, 99 percent of sexually active women ages 15 to 44 have used contraception at some point in their lives, or about 53 million women, up slightly from 2002. An earlier report found that 62 percent of all women of reproductive age were currently using some form of birth control.

The new report found that 98.6 percent of sexually active Catholic women had used contraception at some point, but the data did not show how many Catholic women currently use contraception.

Condom use has risen markedly. More than 93 percent of women said they had partners who had used condoms at some point, compared with 82 percent of women in 1995, a likely effect of strong public advocacy for condom use during the AIDS epidemic.

In contrast, women who had used intrauterine devices, or IUDs, at some point in their lives declined to about 8 percent from 10 percent in 1995. The use of birth control pills has remained steady since 1995 at 82 percent.

Eighty-nine percent of white women said they had used birth control pills at some point, compared with 67 percent of Hispanic women, 78 percent of black women and 57 percent of Asian women.

Education played a role in the type of contraception used. Forty percent of women without a high school diploma said they chose sterilization, while just 10 percent of women with a bachelor’s degree said they used that method. Those without a high school diploma were also far more likely to use three-month injectables, like Depo-Provera — 36 percent compared with 13 percent of women with a college degree.

About 12 percent of college graduates said they had used emergency contraception, while 7 percent of women with only a high school degree said they had used it.

Educated women were far more likely to have practiced periodic abstinence based on the menstrual cycle. About 28 percent of women with a master’s degree or higher had practiced this method, while just 13 percent of women without a high school diploma had, the report found.

White women, American-born Hispanic women and black women were most likely to practice withdrawal, with more than half of women in each group saying they have used that method. Just 44 percent of foreign-born Hispanics said they practiced withdrawal.

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In Japan, the Fax Machine Is Anything but a Relic

Kosuke Okahara for The New York Times

Yuichiro Sugahara, whose company delivers bento lunchboxes, mostly through fax orders.

TOKYO — Japan is renowned for its robots and bullet trains, and has some of the world’s fastest broadband networks. But it also remains firmly wedded to a pre-Internet technology — the fax machine — that in most other developed nations has joined answering machines, eight-tracks and cassette tapes in the dustbin of outmoded technologies.

Last year alone, Japanese households bought 1.7 million of the old-style fax machines, which print documents on slick, glossy paper spooled in the back. In the United States, the device has become such an artifact that the Smithsonian is adding two machines to its collection, technology historians said.

“The fax was such a success here that it has proven hard to replace,” said Kenichi Shibata, a manager at NTT Communications, which led development of the technology in the 1970s. “It has grown unusually deep roots into Japanese society.”

The Japanese government’s Cabinet Office said that almost 100 percent of business offices and 45 percent of private homes had a fax machine as of 2011.

Yuichiro Sugahara learned the hard way about his country’s deep attachment to the fax machine, which the nation popularized in the 1980s. A decade ago, he tried to modernize his family-run company, which delivers traditional bento lunchboxes, by taking orders online. Sales quickly plummeted.

Today, his company, Tamagoya, is thriving with the hiss and beep of thousands of orders pouring in every morning, most by fax, many with minutely detailed handwritten requests like “go light on the batter in the fried chicken” or “add an extra hard-boiled egg.”

“There is still something in Japanese culture that demands the warm, personal feelings that you get with a handwritten fax,” said Mr. Sugahara, 43.

Japan’s reluctance to give up its fax machines offers a revealing glimpse into an aging nation that can often seem quietly determined to stick to its tried-and-true ways, even if the rest of the world seems to be passing it rapidly by. The fax addiction helps explain why Japan, which once revolutionized consumer electronics with its hand-held calculators, Walkmans and, yes, fax machines, has become a latecomer in the digital age, and has allowed itself to fall behind nimbler competitors like South Korea and China.

“Japan has this Galápagos effect of holding on to some things they’re comfortable with,” said Jonathan Coopersmith, a technology historian who is writing a book on the machine’s rise and fall. “Elsewhere, the fax has gone the way of the dodo.”

In Japan, with the exception of the savviest Internet start-ups or internationally minded manufacturers, the fax remains an essential tool for doing business. Experts say government offices prefer faxes because they generate paperwork onto which bureaucrats can affix their stamps of approval, called hanko. Many companies say they still rely on faxes to create a paper trail of orders and shipments not left by ephemeral e-mail. Banks rely on faxes because, they say, customers are worried about the safety of their personal information on the Internet.

Even Japan’s largest yakuza crime syndicate, the Kobe-based Yamaguchi-gumi, has used faxes to send notifications of expulsion to members, the police say.

After the deadly earthquake and tsunami in northeastern Japan in 2011, there was a small boom in fax sales to replace machines that had been washed away. One of the hottest sellers is a model that is powered by batteries so it will keep working during power failures caused by natural disasters.

At Tamagoya, Mr. Sugahara has turned his company’s reliance on the fax and standard telephones into an art form. Every morning, orders for about 62,000 lunches pour in, about half by fax. Most of those lunches are cooked and put onto trucks even before the last order is taken. A small army of 100 fax and telephone operators carefully coordinate deliveries, and fewer than 60 lunches — or 0.1 percent — are wasted.

Hisako Ueno contributed reporting.

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Woman Found Fatally Shot at Home of Pistorius

Emilio Morenatti/Associated Press

Oscar Pistorius, the South African Olympic and Paralympic track star, has been arrested after a woman was shot dead at his home.

JOHANNESBURG — South African police and media reports said on Thursday that Oscar Pistorius, a Paralympic gold medal sprinter nicknamed Blade Runner, was being questioned after his girlfriend was fatally shot at his home in Pretoria, possibly mistaken for an intruder. Police said a man had been arrested, but did not identify him by name.

Mr. Pistorius, 26, who races using carbon fiber prosthetic blades, won two gold medals and a silver at last year’s Paralympic Games in London. He was the first double amputee to also run in the Olympics, where reached the 400-meter semifinal and competed in the 4x400-meter relay.

He is one of South Africa’s best-known athletes.

“We found a 9-mm pistol at the scene. A 26-year-old man was taken into custody,” a police spokeswoman, Katlego Mogale, told Reuters without giving further detail.

Capt. Sarah Mcira, another police spokeswoman, said: “There is a woman who was shot by Oscar Pretorius.”

Johannesburg’s Talk Radio 702 said the victim was thought to have been struck in the head and arm in circumstances that have not been fully explained. But the radio said she may have been mistaken for a burglar.

In the Paralympics last September, Mr. Pistorius won individual gold, when he successfully defended his Paralympic 400 meter title. He had lost his 100- and 200-meter titles, but was part of the gold medal-winning 4x100 meter relay team. He same second in the 200 meter race.

After that contest, Mr. Pistorius damaged his reputation among his followers by criticizing the winner, Alan Oliveira of Brazil, raising questions about the length of the winner’s blades. Mr. Pistorius later apologized and praised the gold medalist in the 100 meter race, Jonnie Peacock of Britain. Mr. Pistorius, who was born without fibulas, had both legs amputated below the knee before his first birthday and he battled for many years to compete against able-bodied athletes. In 2008, he qualified for the Beijing Games but was ruled ineligible by track’s world governing body because his blades were deemed to give him a competitive advantage.

South African journalists said Mr. Pistorius lived in an upscale, walled complex near the South Africa capital of Pretoria and said his girlfriend was a fashion model. South Africa has a high crime rate. and elaborate security precautions, as well as personal weapons, are not uncommon.

A reporter outside the complex on Thursday said it was protected by high walls and razor wire.

Lydia Polgreen reported from Johannesburg, and Alan Cowell from Paris.

This article has been revised to reflect the following correction:

Correction: February 14, 2013

An earlier version of this article referred incorrectly in one reference to the sprinter at whose home a woman was fatally shot. He is Oscar Pistorius, not Pretorias.

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Media Decoder Blog: Comcast Buys Rest of NBC in Early Sale

8:53 p.m. | Updated Comcast gave NBCUniversal a $16.7 billion vote of confidence on Tuesday, agreeing to pay that sum to acquire General Electric’s remaining 49 percent stake in the entertainment company. The deal accelerated a sales process that was expected to take several more years.

Brian Roberts, chief executive of Comcast, said the acquisition, which will be completed by the end of March, underscored a commitment to NBCUniversal and its highly profitable cable channels, expanding theme parks and the resurgent NBC broadcast network.

“We always thought it was a strong possibility that we’d some day own 100 percent,” Mr. Roberts said in a telephone interview.

He added that the rapidly changing television business and the growing necessity of owning content as well as the delivery systems sped up the decision. “It’s been a very smooth couple of years, and the content continues to get more valuable with new revenue streams,” he said.

Comcast also said that NBCUniversal would buy the NBC studios and offices at 30 Rockefeller Center, as well as the CNBC headquarters in Englewood Cliffs, N.J. Those transactions will cost about $1.4 billion.

Mr. Roberts called the 30 Rockefeller Center offices “iconic” and said it would have been “expensive to replicate” studios elsewhere for the “Today” show, “Saturday Night Live,” “Late Night With Jimmy Fallon” and other programs produced there. “We’re proud to be associated with it,” Mr. Roberts said of the building.

With the office space comes naming rights for the building, according to a General Electric spokeswoman. So it is possible that one of New York’s most famous landmarks, with its giant red G.E. sign, could soon be displaying a Comcast sign instead.

When asked about a possible logo swap on the building, owned by Tishman Speyer, Mr. Roberts told CNBC, that is “not something we’re focused on talking about today.” Nevertheless, the sale was visible in a prominent way Tuesday night: the G.E. letters, which have adorned the top of 30 Rock for several decades, were not illuminated for an hour after sunset. But the lights flickered back on later in the evening.

Comcast, with a conservative, low-profile culture, had clashed with the G.E. approach, according to employees and executives in television. Comcast moved NBCUniversal’s executive offices from the 52nd floor to the 51st floor — less opulent space that features smaller executive offices and a cozy communal coffee room instead of General Electric’s lavish executive dining room.

Comcast took control of NBCUniversal in early 2011 by acquiring 51 percent of the media company from General Electric. The structure of the deal gave Comcast the option of buying out G.E. in a three-and-a-half to seven-year time frame. In part because of the clash in corporate cultures, television executives said, both sides were eager to accelerate the sale.

Price was also a factor. Mr. Roberts said he believed the stake would have cost more had Comcast waited. Also, he pointed to the company’s strong fourth-quarter earnings to be released late Tuesday afternoon, which put it in a strong position to complete the sale.

Comcast reported a near record-breaking year with $20 billion in operating cash flow in the fiscal year 2012. In the three months that ended Dec. 31, Comcast’s cash flow increased 7.3 percent to $5.3 billion. Revenue at NBCUniversal grew 4.8 percent to $6 billion.

“We’ve had two years to make the transition and to make the investments that we believe will continue to take off,” Mr. Roberts said.

The transactions with General Electric will be largely financed with $11.4 billion of cash on hand, $4 billion of subsidiary senior unsecured notes to be issued to G.E. and a $2 billion in borrowings.

Even with the investment in NBCUniversal, Comcast said it would increase its dividend by 20 percent to 78 cents a share and buy back $2 billion in stock in 2013.

When it acquired the 51 percent stake two years ago, Comcast committed to paying about $6.5 billion in cash and contributed all of its cable channels, including E! and some regional sports networks, to the newly established NBCUniversal joint venture. Those channels were valued at $7.25 billion.

The transaction made Comcast, the single biggest cable provider in the United States, one of the biggest owners of cable channels, too. NBCUniversal operates the NBC broadcast network, 10 local NBC stations, USA, Bravo, Syfy, E!, MSNBC, CNBC, the NBC Sports Network, Telemundo, Universal Pictures, Universal Studios, and a long list of other media brands.

Mr. Roberts and Michael J. Angelakis, vice chairman and chief financial officer for the Comcast Corporation, led the negotiations that began last year with Jeffrey R. Immelt, chief executive of General Electric, and Keith Sharon, the company’s chief financial officer. JPMorgan Chase, Goldman Sachs, Centerview Partners and CBRE provided financial and strategic advice.

The sale ends a long relationship between General Electric and NBC that goes back before the founding days of television. In 1926, the Radio Corporation of America created the NBC network. General Electric owned R.C.A. until 1930. It regained control of R.C.A., including NBC, in 1986, in a deal worth $6.4 billion at the time.

In a slide show on the company’s “GE Reports” Web site titled “It’s a Wrap: GE, NBC Part Ways, Together They’ve Changed History,” G.E. said the deal with Comcast “caps a historic, centurylong journey for the two companies that gave birth to modern home entertainment.”

Mr. Immelt has said that NBCUniversal did not mesh with G.E.’s core industrial businesses. That became even more apparent when the company became a minority stakeholder with no control over how the business was run, according to a person briefed on G.E.’s thinking who could not discuss private conversations publicly.

“By adding significant new capital to our balanced capital allocation plan, we can accelerate our share buyback plans while investing in growth in our core businesses,” Mr. Immelt said in a statement. He added: “For nearly 30 years, NBC — and later NBCUniversal — has been a great business for G.E. and our investors.”

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Well: Getting the Right Dose of Exercise

Phys Ed

Gretchen Reynolds on the science of fitness.

A common concern about exercise is that if you don’t do it almost every day, you won’t achieve much health benefit. But a commendable new study suggests otherwise, showing that a fairly leisurely approach to scheduling workouts may actually be more beneficial than working out almost daily.

For the new study, published this month in Exercise & Science in Sports & Medicine, researchers at the University of Alabama at Birmingham gathered 72 older, sedentary women and randomly assigned them to one of three exercise groups.

One group began lifting weights once a week and performing an endurance-style workout, like jogging or bike riding, on another day.

Another group lifted weights twice a week and jogged or rode an exercise bike twice a week.

The final group, as you may have guessed, completed three weight-lifting and three endurance sessions, or six weekly workouts.

The exercise, which was supervised by researchers, was easy at first and meant to elicit changes in both muscles and endurance. Over the course of four months, the intensity and duration gradually increased, until the women were jogging moderately for 40 minutes and lifting weights for about the same amount of time.

The researchers were hoping to find out which number of weekly workouts would be, Goldilocks-like, just right for increasing the women’s fitness and overall weekly energy expenditure.

Some previous studies had suggested that working out only once or twice a week produced few gains in fitness, while exercising vigorously almost every day sometimes led people to become less physically active, over all, than those formally exercising less. Researchers theorized that the more grueling workout schedule caused the central nervous system to respond as if people were overdoing things, sending out physiological signals that, in an unconscious internal reaction, prompted them to feel tired or lethargic and stop moving so much.

To determine if either of these possibilities held true among their volunteers, the researchers in the current study tracked the women’s blood levels of cytokines, a substance related to stress that is thought to be one of the signals the nervous system uses to determine if someone is overdoing things physically. They also measured the women’s changing aerobic capacities, muscle strength, body fat, moods and, using sophisticated calorimetry techniques, energy expenditure over the course of each week.

By the end of the four-month experiment, all of the women had gained endurance and strength and shed body fat, although weight loss was not the point of the study. The scientists had not asked the women to change their eating habits.

There were, remarkably, almost no differences in fitness gains among the groups. The women working out twice a week had become as powerful and aerobically fit as those who had worked out six times a week. There were no discernible differences in cytokine levels among the groups, either.

However, the women exercising four times per week were now expending far more energy, over all, than the women in either of the other two groups. They were burning about 225 additional calories each day, beyond what they expended while exercising, compared to their calorie burning at the start of the experiment.

The twice-a-week exercisers also were using more energy each day than they had been at first, burning almost 100 calories more daily, in addition to the calories used during workouts.

But the women who had been assigned to exercise six times per week were now expending considerably less daily energy than they had been at the experiment’s start, the equivalent of almost 200 fewer calories each day, even though they were exercising so assiduously.

“We think that the women in the twice-a-week and four-times-a-week groups felt more energized and physically capable” after several months of training than they had at the start of the study, says Gary Hunter, a U.A.B. professor who led the experiment. Based on conversations with the women, he says he thinks they began opting for stairs over escalators and walking for pleasure.

The women working out six times a week, though, reacted very differently. “They complained to us that working out six times a week took too much time,” Dr. Hunter says. They did not report feeling fatigued or physically droopy. Their bodies were not producing excessive levels of cytokines, sending invisible messages to the body to slow down.

Rather, they felt pressed for time and reacted, it seems, by making choices like driving instead of walking and impatiently avoiding the stairs.

Despite the cautionary note, those who insist on working out six times per week need not feel discouraged. As long as you consciously monitor your activity level, the findings suggest, you won’t necessarily and unconsciously wind up moving less over all.

But the more fundamental finding of this study, Dr. Hunter says, is that “less may be more,” a message that most likely resonates with far more of us. The women exercising four times a week “had the greatest overall increase in energy expenditure,” he says. But those working out only twice a week “weren’t far behind.”

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Well: Getting the Right Dose of Exercise

Phys Ed

Gretchen Reynolds on the science of fitness.

A common concern about exercise is that if you don’t do it almost every day, you won’t achieve much health benefit. But a commendable new study suggests otherwise, showing that a fairly leisurely approach to scheduling workouts may actually be more beneficial than working out almost daily.

For the new study, published this month in Exercise & Science in Sports & Medicine, researchers at the University of Alabama at Birmingham gathered 72 older, sedentary women and randomly assigned them to one of three exercise groups.

One group began lifting weights once a week and performing an endurance-style workout, like jogging or bike riding, on another day.

Another group lifted weights twice a week and jogged or rode an exercise bike twice a week.

The final group, as you may have guessed, completed three weight-lifting and three endurance sessions, or six weekly workouts.

The exercise, which was supervised by researchers, was easy at first and meant to elicit changes in both muscles and endurance. Over the course of four months, the intensity and duration gradually increased, until the women were jogging moderately for 40 minutes and lifting weights for about the same amount of time.

The researchers were hoping to find out which number of weekly workouts would be, Goldilocks-like, just right for increasing the women’s fitness and overall weekly energy expenditure.

Some previous studies had suggested that working out only once or twice a week produced few gains in fitness, while exercising vigorously almost every day sometimes led people to become less physically active, over all, than those formally exercising less. Researchers theorized that the more grueling workout schedule caused the central nervous system to respond as if people were overdoing things, sending out physiological signals that, in an unconscious internal reaction, prompted them to feel tired or lethargic and stop moving so much.

To determine if either of these possibilities held true among their volunteers, the researchers in the current study tracked the women’s blood levels of cytokines, a substance related to stress that is thought to be one of the signals the nervous system uses to determine if someone is overdoing things physically. They also measured the women’s changing aerobic capacities, muscle strength, body fat, moods and, using sophisticated calorimetry techniques, energy expenditure over the course of each week.

By the end of the four-month experiment, all of the women had gained endurance and strength and shed body fat, although weight loss was not the point of the study. The scientists had not asked the women to change their eating habits.

There were, remarkably, almost no differences in fitness gains among the groups. The women working out twice a week had become as powerful and aerobically fit as those who had worked out six times a week. There were no discernible differences in cytokine levels among the groups, either.

However, the women exercising four times per week were now expending far more energy, over all, than the women in either of the other two groups. They were burning about 225 additional calories each day, beyond what they expended while exercising, compared to their calorie burning at the start of the experiment.

The twice-a-week exercisers also were using more energy each day than they had been at first, burning almost 100 calories more daily, in addition to the calories used during workouts.

But the women who had been assigned to exercise six times per week were now expending considerably less daily energy than they had been at the experiment’s start, the equivalent of almost 200 fewer calories each day, even though they were exercising so assiduously.

“We think that the women in the twice-a-week and four-times-a-week groups felt more energized and physically capable” after several months of training than they had at the start of the study, says Gary Hunter, a U.A.B. professor who led the experiment. Based on conversations with the women, he says he thinks they began opting for stairs over escalators and walking for pleasure.

The women working out six times a week, though, reacted very differently. “They complained to us that working out six times a week took too much time,” Dr. Hunter says. They did not report feeling fatigued or physically droopy. Their bodies were not producing excessive levels of cytokines, sending invisible messages to the body to slow down.

Rather, they felt pressed for time and reacted, it seems, by making choices like driving instead of walking and impatiently avoiding the stairs.

Despite the cautionary note, those who insist on working out six times per week need not feel discouraged. As long as you consciously monitor your activity level, the findings suggest, you won’t necessarily and unconsciously wind up moving less over all.

But the more fundamental finding of this study, Dr. Hunter says, is that “less may be more,” a message that most likely resonates with far more of us. The women exercising four times a week “had the greatest overall increase in energy expenditure,” he says. But those working out only twice a week “weren’t far behind.”

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Advertising: Small Rival Music Service Takes Aim at Pandora

ONE of advertising’s great (or at least most amusing) traditions is the challenger attack ad, in which a field’s No. 2 (or No. 3) player tries to distinguish itself by taking aim at the leader. When artfully done it can have a great effect, as in Avis’s long-running “We try harder” campaign against Hertz, or Samsung’s recent ads mocking the obedience of iPhone fans.

The latest example is in digital music services, with Pandora as the Goliath and its much smaller competitor Slacker in the role of David with the 30-second sling.

In an online-only spot that will start running Wednesday, a young woman at a coffee shop vexes everyone in earshot when she opens a blue “Pandora’s box” — labeled “P,” like Pandora’s app icon — and unleashes a singularly annoying song.

“It plays that over and over again,” the woman complains to a friend, who blames Pandora’s “small music library” for the repetition. With Slacker helpfully loaded on her phone, the friend points out that Slacker has 10 times as many songs, and other features, too.

Like Pandora, Slacker offers free, ad-supported Internet radio and has two tiers of premium service. Listeners can eliminate ads for a $4 monthly subscription, and $10 a month also adds features that — like Spotify and other “on-demand” services — let users play any song they choose.

Since its founding in 2006, however, Slacker has struggled to stand out. With four million monthly users, 560,000 of them paying, its audience is a fraction of Pandora’s, which is more than 65 million a month; Clear Channel Communications has nearly 50 million online listeners through its station sites and iHeartRadio app.

To promote itself among such formidable competition — and to introduce a revamped version of its site — Slacker wants to show that it tries harder.

“We had to be very honest with where we were in the marketplace,” said Craig Rechenmacher, Slacker’s chief marketing officer. “We had to be disruptive in the marketplace, and we needed something that targets our competitors and the holes in their service.”

Slacker will spend $5.5 million on media placements this year, Mr. Rechenmacher said. In addition to the video spot, by Liquid Advertising, the campaign will include display ads by the agency Questus, and they will run on music and pop-culture sites like YouTube, Vevo, Brooklyn Vegan and College Humor.

The ads show off what Slacker says is its human touch, with playlists created by music experts and stations featuring D.J.’s and commentators. Pandora caters to listeners’ tastes through a secret algorithm that analyzes each song’s musical “genome.” (Others, like Songza, have grown quickly through expert programming, but Pandora is the field’s leader by far.)

“When we did research on our core users, what they love the most, what came back was the idea that it felt like somebody was home,” said Jack Isquith, Slacker’s senior vice president of strategic development. “There was someone who loves music at the controls.”

The campaign is also evidence of a slow change in the marketing of digital music services, many of which have avoided advertising in favor of online word-of-mouth (and, of course, lots of free music). Pandora, for example, is often featured in commercials by its partners, like car companies, but has made none of its own.

“It costs a lot of money to build a brand if you didn’t hit it luckily through viral channels, like Pandora did,” said David Hyman, the former chief executive of the music service Mog, which was sold last year to Beats Electronics.

The biggest force in promoting digital music over the years, music executives say, was Apple’s iTunes and iPod commercials. Rhapsody, too, has run dozens of television ads, including a memorable one with Jay-Z in 2009.

For the most part the recent wave of streaming services has not been heavily advertised, but that is changing as the field grows more competitive. Last year, Rdio, a subscription service, did a multimillion-dollar campaign that included billboards in Times Square. Spotify, which has grown quickly but has not fully penetrated the mainstream market, recently hired its first agency of record, Droga5 — the former agency of Rhapsody.

For its campaign, Slacker wanted to focus on how digital services serve consumers. In the coffee shop video, the patrons align with the demographics of the service — 18 to 44 years old, and slightly more females than males, said Will Akerlof, the chief executive of Liquid Advertising — and visibly express their reactions to the music playing.

To find a sufficiently irritating soundtrack, the agency looked at a 2007 Rolling Stone magazine feature, “The 20 Most Annoying Songs,” Mr. Akerlof said, and recorded a techno-pop version of the folk song “Cotton-Eyed Joe,” in the style of Rednex’s version from the mid-1990s (No. 13 on the list).

That lighthearted approach, with a focus on the consumer, has been missing from many digital-music ads, Mr. Isquith said.

“The approaches of many of the people in the space has been, ‘Hey, we’re standing next to big stars,’ or, ‘Hey, we’ve got the slickest, most cutting-edge tech product,’ but that’s not why people use it,” he said.

“Our ads,” Mr. Isquith added, “are meant to say that this is a great listener experience that will delight you.”

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