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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Ryan O'Neal wins appeals ruling in defamation case

LOS ANGELES (AP) — Ryan O'Neal may have enough evidence to show that he was defamed by a man who claimed the actor stole a valuable portrait of the late Farrah Fawcett, an appeals court ruled Thursday.

A divided panel of the 2nd District Court of Appeal ruled that O'Neal's case against Craig Nevius, a former Fawcett associate, should be allowed to proceed and that the actor may be able to win some damages. One justice disagreed and wrote that the case should be dismissed.

O'Neal sued in July 2011, claiming he was defamed by Nevius' comments that the actor had stolen a Fawcett portrait created by Andy Warhol. The painting is the subject of a separate lawsuit between O'Neal and the University of Texas, which claims Fawcett left the artwork to the school after her 2009 death.

Nevius' attorney, Lincoln Bandlow, said he would appeal the ruling to the California Supreme Court. He had appealed a lower court's ruling allowing the case to go forward.

O'Neal's attorney Todd Eagan wrote in a statement that he and O'Neal were pleased with the ruling. "We look forward to a complete victory against Mr. Nevius at trial," he wrote.

O'Neal's suit seeks more than $1 million in damages. He claimed in the case that Warhol gave him the portrait and he intends to bequeath it to his only son from his longtime relationship with Fawcett, Redmond O'Neal.

Nevius' comments that O'Neal stole the artwork were made in interviews with Star magazine and "Good Morning America," and he cooperated with UT investigators searching for the portrait.

Although Nevius initially denied he accused O'Neal of stealing the painting, he acknowledged in a later court filing that he made the claim to university investigators.

"The inferences reasonably drawn from the evidence here would support a jury's finding that Nevius harbored strong ill-feelings toward O'Neal," the justices siding with O'Neal wrote. The dissent argues that Nevius' comments were constitutionally protected speech and the case should have been dismissed.

O'Neal's fight with UT over the portrait returns to court Feb. 27.

The actor and Nevius have battled in court for years.

Nevius collaborated on a documentary of Fawcett's fight with cancer but sued the actor claiming he interfered in the project and removed him from it shortly before Fawcett's death. The case was dismissed before trial.

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Anthony McCartney can be reached at http://twitter.com/mccartneyAP .

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DealBook: S.E.C. Is Said to Be Investigating Trading Before Heinz Deal

Regulators are scrutinizing unusual trading surrounding the planned $23 billion takeover of the food company H. J. Heinz, raising questions about potential illegal activity in one of the biggest deals in recent memory, a person briefed on the matter said.

The Securities and Exchange Commission opened an insider trading inquiry on Thursday as Berkshire Hathaway and the investment firm 3G Capital agreed to pay $72.50 a share for Heinz, this person said. Regulators first noticed a suspicious spike in trading on Wednesday.

If the S.E.C.’s preliminary inquiry turns into a broader investigation, it could cast a shadow over the deal. As part of the process, authorities would turn their focus toward the limited universe of insiders who could have tipped off traders about the deal.

The agency’s inquiry is expected to be centered on options trading in Heinz, activity that soared this week as news of the deal circulated Wall Street. In what is known as a call option, investors can place a bullish bet on a stock, without actually committing to buy the shares. Instead, investors have the opportunity to buy at a given price and future date.

As recently as Tuesday, there was scant activity in Heinz options. But by Wednesday, as the companies were putting the finishing touches on the deal, options trading jumped, data from Bloomberg shows.

The price of Heinz’s stock soared after the deal was announced. The stock finished up nearly 20 percent on Thursday to close at $72.50, matching the offer price.

The S.E.C. is focusing on the sudden leap in options trading Wednesday, building on a related case it filed last year that also involved 3G, a company with Brazilian roots. In September, the agency obtained an emergency court order to freeze the assets of a Brazilian man suspected of insider trading around 3G Capital’s takeover of Burger King. The trader, a Brazilian citizen who worked at Wells Fargo in Miami, reportedly received the tip from a 3G investor.

Neither the company nor any individual at 3G has been accused of any wrongdoing in that case or in the Heinz inquiry.

While the inquiry is in its early stages, the person briefed on the matter said that regulators could take relatively prompt action. If it is concerned that traders might move the money overseas, the S.E.C. could ask a federal court to freeze the traders’ assets.

The S.E.C. routinely opens inquiries into trading activity after major mergers are announced, but often does not bring charges. The agency, however, has renewed its focus on insider trading, mounting dozens of cases in recent years.

An S.E.C. spokesman declined to comment. Bloomberg News earlier reported that S.E.C. investigators were reviewing the surge in Heinz options trading.

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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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Epic to pull song with offending Lil Wayne lyric

NASHVILLE, Tenn. (AP) — Epic Records is going to "great efforts" to take down a new Future remix leaked over the weekend with a vulgar Lil Wayne lyric that has offended the family of Emmett Till.

The New Orleans rapper made a sexual reference to the beating death of Till, a 14-year-old Chicago boy tortured and shot in Mississippi in 1955 for whistling at a white woman. Till's family objected and the Rev. Jesse Jackson reached out to his management, The Blueprint Group, on the family's behalf.

The label issued a statement Wednesday night apologizing for the release of the song.

"We regret the unauthorized remix version of Future's 'Karate Chop,' which was leaked online and contained hurtful lyrics," the statement said. "Out of respect for the legacy of Emmett Till and his family and the support of the Reverend Jesse L. Jackson, Sr. ... we are going through great efforts to take down the unauthorized version."

Epic will release an official version of the song that "will not include such references."

Neither Jackson nor members of Till's family could be reached late Wednesday. A publicist says Lil Wayne has had no comment so far.

He appears briefly on the song, alluding to the black teenager's beating in a way too vulgar to print.

Till, a native of Chicago, was in Mississippi visiting family in 1955 when he was killed. He was beaten, had his eyes gouged out and was shot in the head before his assailants tied a cotton gin fan to his body with barbed wire and tossed his body into the Tallahatchie River. Two white men, including the woman's husband, were acquitted of the killing by an all-white jury.

Till's body was recovered and returned to Chicago where his mother, Mamie Till, insisted on having an open casket at his funeral. The pictures of his battered body helped push civil rights into the cultural conversation in the U.S.

Bob Dylan wrote a song about it: "The Death of Emmett Till."

A Facebook posting on the Mamie Till Mobley Memorial Foundation page Wednesday night said Epic Records Chairman and CEO LA Reid had reached out to the family to personally apologize.

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Follow AP Music Writer Chris Talbott: http://twitter.com/Chris_Talbott

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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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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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California Fugitive Is Believed to Have Died in Blaze

Alex Gallardo/Reuters

Police officers searched for Christopher J. Dorner on Tuesday at a checkpoint in Yucaipa, Calif.

BIG BEAR LAKE, Calif. — After a shootout and a forest standoff on Tuesday afternoon, Christopher J. Dorner, the former Los Angeles police officer sought in the region’s largest manhunt, was apparently killed in a cabin as it burned down around him, but officials said they needed time to sort through the rubble.

At 11 p.m., the San Bernardino County Sheriff’s Office released a statement, saying that “charred human remains” had been located inside the burned-out cabin. Though the remains were not identified as those of Mr. Dorner — “identification will be attempted through forensic means,” the statement said — there is little doubt they are his.

“We believe he was still inside the cabin” when it went up in flames, Cindy Bachman, a spokeswoman for the sheriff’s office, said earlier during a news conference in Angelus Oaks, six miles from the scene. Mr. Dorner, a self-described survivalist believed to be heavily armed, had holed up in the rental cabin hours earlier and engaged deputies in a shootout, killing one deputy and wounding a second.

The dramatic chain of events, which included hostage taking and a chase in vehicles and on foot, played out in the sun-dappled, snowy San Bernardino Mountains.

It was unclear how the fire at the cabin began, but the authorities said that no one escaped the blaze and that Mr. Dorner was believed to be alone inside.

Officers, shouting orders through loudspeakers for Mr. Dorner to surrender, heard what they believed to be a single gunshot from within.

News organization widely reported that Mr. Dorner’s body was found in the building, but a spokesman from the Los Angeles Police Department said on Tuesday evening that they did not have the body.

Even after officers retrieve the body, it could take days or weeks to identify it, officials said. Cindy Bachman, a spokeswoman for the San Bernardino County sheriff, said in an evening news conference, “We believe that he was still inside the cabin,” but that it was not safe to enter because of the heat.

Both the suspect and the police were believed to have used smoke grenades during the shootout. The two deputies who were shot were airlifted to Loma Linda University Medical Center; the second deputy’s condition was not disclosed on Tuesday evening, but he was expected to recover.

The standoff drew scores of police officers and sheriff’s deputies from surrounding jurisdictions, led by the San Bernardino Sheriff-Coroner Department. The tension heightened as the day wore on, and local schools were locked down.

Law enforcement agencies ordered news helicopters to keep their distance for the protection of the officers involved. The sheriff’s online feed to the department’s radio scanner was shut down for the same reason. Reporters were asked to stop posting updates on Twitter.

The police believed that Mr. Dorner was monitoring the news, and Cmdr. Andrew Smith, a spokesman for the Los Angeles Police Department, addressed him directly at a news briefing on Tuesday afternoon.

“Enough is enough,” Commander Smith said. “It’s time to stop the bloodshed and let this incident be over.”

Officers had been searching the Big Bear area since last week, when Mr. Dorner’s burning truck was found on a forest road. Mr. Dorner, a former reservist in the Navy, had boasted about his sharpshooting and survival abilities.

Days ago, Mr. Dorner apparently broke into a couple’s home on Club View Drive, the authorities said on Tuesday. The street is nestled beside a golf course in a community called Moonridge near Big Bear Lake. Mr. Dorner reportedly tied them up as his hostages and stayed out of sight until Tuesday afternoon.

Shortly after 12 p.m. Tuesday, the authorities received a report of a stolen white pickup truck and a description that fit Mr. Dorner’s. Soon after, he was spotted driving a white 2005 Dodge pickup by an officer with the California Department of Fish and Wildlife. The suspect was driving toward the officer in the opposite lane, said Andrew Hughan, a spokesman for the department. The officer recognized Mr. Dorner, stepped out of his vehicle and fired at the suspect, who returned fire. Neither was injured, Mr. Hughan said.

The officer and a colleague chased the man, who crashed the pickup, fired at them and ran into the cabin.

Ian Lovett reported from Big Bear Lake, Jennifer Medina from Los Angeles, Michael Wilson from New York, and Fernanda Santos from Angelus Oaks, Calif. Rebecca Fairley Raney contributed reporting from Big Bear Lake.

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Beyonce hopes her documentary inspires Blue Ivy

NEW YORK (AP) — Beyonce is hoping that her ultra-revealing documentary will someday provide inspiration for Blue Ivy, the year-old daughter she and husband Jay-Z have.

"I hope that she will see all of the beautiful times (and) all the tough times that led up to her being here," the singer said Tuesday night at the New York premiere of her upcoming HBO documentary, "Life is But a Dream."

She added: "I'm hoping that ... it can comfort her and inspire her in her life when she needs it."

The autobiographical film takes a no-holds-barred look at the entertainer. It stems from personal conversations the 31-year old singer made using the video camera on her computer over the past couple of years. It also includes home movies of the Grammy-winning singer and her two sisters.

In the film, Beyonce candidly discusses personal matters like her miscarriage, reports of faking her pregnancy, and firing her father as her manager.

She claims the process of talking into a camera to get all her thoughts out was therapeutic.

"I really grew so much," she says of the process. "This movie has really been my therapy. I've healed from so many wounds and I've been able to understand why some of the things I've been through, why I went through, so feel really proud, and hopefully I can inspire other people."

The singer has been private about her life in the past. But she felt the time was right to let people know how she felt.

"I felt that after 16 years of being a public singer, people didn't know who I was," she admitted. But then she added: "I will always keep certain things to myself because it's only natural."

Oprah Winfrey made a surprise visit to the premiere, and posed with Beyonce on the red carpet. Before going into the Ziegfeld Theatre, Winfrey, known for her tough, results-driven interview style, was asked if this was the kind of story she would have done on Beyonce.

She said Beyonce did a "much better job" of telling her own story. "I wouldn't have been in the bedroom and in the closet and in the car and on vacation," she said.

Beyonce acted as the film's executive producer and co-directed it with Ed Burke. He previously worked on some of her video projects. "Life is But a Dream" airs Saturday on HBO.

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Online:

http://www.hbo.com

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John Carucci covers entertainment for The Associated Press. Follow him at — http://www.twitter.com/jcarucci_ap

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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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