Woman Found Fatally Shot at Home of Pistorius

Emilio Morenatti/Associated Press

Oscar Pistorius, the South African Olympic and Paralympic track star, was involved in the fatal shooting of a 30-year-old woman, the police said.

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 and reached the 400-meter semifinal the London games.

“We found a 9-millimeter 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 race, 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. Pretorius lived in an upscale, walled complex near the South Africa capital of Pretoria and said his girlfriend was a well-known 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.

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Plumlee leads No. 2 Duke past UNC, 73-68

DURHAM, N.C. (AP) — With its star big man on the bench with foul trouble, Duke went small to beat its top rival — and one of its smallest players came up big.

The run that propelled the second-ranked Blue Devils to a 73-68 victory over North Carolina on Wednesday night started when Mason Plumlee sat down and backup guard Tyler Thornton warmed up.

"I think the hero for us this game was Thornton," coach Mike Krzyzewski said. "He would not let us lose."

Plumlee finished with his usual big numbers — 18 points, 11 rebounds — while Quinn Cook scored 18 points and Rasheed Sulaimon finished with 13 for the Blue Devils (22-2, 9-2 Atlantic Coast Conference).

But the contributions of Thornton couldn't be overlooked.

Thornton finished with nine points on three 3-pointers — or, as many points as he had in his previous three games combined — and two of those 3s came during the run midway through the second half that completely flipped the game's momentum.

"It's just the heart and the will to want to win," Thornton said. "Especially coming down the stretch, you've got to go all out and leave it on the floor, and I think we did that."

Duke shot 44 percent — 52 percent after halftime — and erased a slow start with that timely run and win its sixth straight this season and sixth in eight meetings in college basketball's fiercest rivalry.

P.J. Hairston matched a career high with 23 points and Reggie Bullock had 15 points with four 3-pointers for North Carolina (16-8, 6-5), which led for the first 26 minutes but went on to lose its second straight.

The Tar Heels were 13 of 23 from the free-throw line and missed 7 of 10 during a critical late stretch while falling to 1-4 this season against ranked opponents.

"If I knew how to fix the blessed thing, I would have fixed it," coach Roy Williams said of his team's struggles at the line. "The bottom line is, we didn't make free throws today. We're not a good free-throw shooting team in games."

Still, they trailed just 65-61 in the final minute and appeared to have gotten a stop by forcing Thornton to miss a long 3-pointer with the shot clock winding down. But Bullock fouled Sulaimon on the rebound, and the freshman hit both free throws with 37.5 seconds left.

Hairston hit a free throw on North Carolina's next possession to cut it to 67-62, but Plumlee countered with two free throws with 30.3 seconds left to make it a three-possession game.

Seth Curry scored 11 points in his sixth straight double-figure performance against North Carolina.

The win was a nice present for Krzyzewski, who was celebrating his 66th birthday.

And an unorthodox move — putting one of the best big men in the nation on the bench, however briefly — wound up putting Duke ahead for the first time in this one.

Plumlee picked up his third foul 31 seconds into the second half and uncorked an untimely 20-foot jumper a few minutes later, prompting Krzyzewski to burn a timeout. He went to a smaller lineup, sitting Plumlee in favor of two power forwards, Amile Jefferson and Josh Hairston.

"I thought he was playing like he had three fouls," Krzyzewski said. UNC's James Michael "McAdoo was just going at him so that McAdoo was either going to score, or Mason was going to foul him."

The move freed up some space for the Duke guards and immediately led to six quick points to start the 19-7 run that put the Blue Devils ahead to stay.

Duke outscored North Carolina 11-3 during the 4-minute stretch with Plumlee on the bench and took their first lead when Curry swished a 3 from in front of the bench to make it 42-41 with 14 minutes left.

Thornton — who had missed 12 of 14 3-pointers during his previous eight games — hit two of them from the same spot in the right corner, capping the spurt with his second that made it 50-45 with 12½ minutes to go.

Curry eventually stretched the lead to 59-51 with another 3 with 5 minutes left.

"They started knocking down shots in the second half, open 3-pointers," Bullock said. "I think our team played great, we played with better sense of urgency, we played with better effort, we were more involved in the game and what's happening. But they started knocking down shots and they started gaining momentum, and we wasn't connecting when we were open."

Dexter Strickland added 14 points but McAdoo was held to nine on 4-of-12 shooting for North Carolina, which came in as a written-off, double-digit underdog after a 26-point loss at No. 3 Miami that marked its worst loss of the season.

But the Tar Heels were aggressive early and methodically built a double-figure lead, the third straight year they came into Cameron and went up by 10. Bullock's third 3 of the half with about 6:45 left put North Carolina up 28-18.

"The intensity tonight was better than it has been all year long," Williams said.

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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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Iran to Resume Nuclear Talks

PARIS — As it prepares for two sets of negotiations with outsiders on its disputed nuclear program starting on Wednesday, Iran said on that it was converting some of its enriched uranium into reactor fuel, the state news agency IRNA reported, potentially limiting the expansion of stockpiles that the West fears could be used for weapons.

Iranian officials are to meet on Wednesday in Tehran with Herman Nackaerts, the deputy director of the International Atomic Energy Agency, the United Nations nuclear watchdog, who has been pressing for months for access to a restricted military area at Parchin, 20 miles south of Tehran. International inspectors suspect that the site may have been used for testing bomb triggers.

“Differences remain but we will work hard to try to resolve these differences,” Mr. Nackaerts told reporters before leaving Vienna for Tehran, IRNA said.

On a separate negotiating track later this month, Iranian negotiators are to meet in Kazakhstan with representatives of six powers — the United States, China, Russia, Britain, France and Germany — for a further round in a series of long-running and inconclusive talks about curbing Tehran’s uranium enrichment program.

Faced with economic sanctions, suspected cyber attacks and threats of military action against its nuclear facilities, Iran came under fresh pressure from President Obama in his State of the Union address to settle its differences with the West.

"The leaders of Iran must recognize that now is the time for a diplomatic solution, because a coalition stands united in demanding that they meet their obligations and we will do what is necessary to prevent them from getting a nuclear weapon,” Mr. Obama said.

Western countries suspect that the Iranian government is seeking to acquire the technology to make nuclear weapons despite its assertion that the program is for peaceful purposes like the creation of reactor fuel for civilian use.

At a news conference on Tuesday in Tehran, Ramin Mehmanparast, the Foreign Ministry spokesman, was asked to comment on a news report that Iranian scientists had converted some uranium enriched to 20 percent purity into fuel for a research reactor in Tehran. The spokesman said that the “work is being done” and that details had been sent to the I.A.E.A., which is based in Vienna.

Iran’s nuclear program came under added scrutiny on Tuesday after North Korea conducted its third nuclear test, since many intelligence officials believe that the two countries share nuclear knowledge, though so far there is no hard evidence to substantiate that belief.

Reuters quoted Mr. Mehmanparast as saying, “We think we need to come to a point where no country will have any nuclear weapons.” While all countries should be allowed to use nuclear technology for peaceful purposes, he said, “all weapons of mass destruction and nuclear arms need to be destroyed.”

Iran’s stockpile of enriched uranium is believed by Western negotiators and international inspectors to be of far lower purity than is required to make nuclear weapons. Diplomats in Vienna said on Tuesday that enriched uranium converted into reactor fuel is hard to convert into fuel for weapons.

Some analysts argue that, by slowing the growth of its stockpile, Tehran could delay the moment when it acquires enough 20 percent enriched uranium to set off a response by Israel, which has signaled readiness to attack Iran’s nuclear sites.

The likely outcomes of the forthcoming sets of negotiations remain unclear.

Mr. Mehmanparast, the Iranian spokesman, said the talks with the I.A.E.A. team in Tehran on Wednesday had “bright” prospects if the I.A.E.A. negotiators recognized Iran’s rights, IRNA said.

But Yukiya Amano, the director general of the I.A.E.A., said Monday that “the outlook is not bright” for obtaining permission to visit the Parchin site. Mr. Amano’s remarks contrasted with a more optimistic tone from the agency less than a month ago, when his deputy, Mr. Nackaerts, expressed hope that the negotiations would lead to an agreement on an inspection plan.

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Body slam for wrestling: Sport cut from Olympics

LAUSANNE, Switzerland (AP) — For wrestling, this may have been the ultimate body slam: getting tossed out of the Olympic rings.

The vote Tuesday by the IOC's executive board stunned the world's wrestlers, who see their sport as popular in many countries and steeped in history as old as the Olympics themselves.

While wrestling will be included at the 2016 Olympics in Rio de Janeiro, it was cut from the games in 2020, which have yet to be awarded to a host city.

2004 Olympic Greco-Roman champion Khasan Baroev of Russia called the decision "mind-boggling."

"I just can't believe it. And what sport will then be added to the Olympic program? What sport is worthy of replacing ours?" Baroev told the ITAR-Tass news agency. "Wrestling is popular in many countries — just see how the medals were distributed at the last Olympics."

American Rulan Gardner, who upset three-time Russian Olympic champion Alexander Karelin at the Sydney Games in an epic gold-medal bout known as the "Miracle on the Mat," was saddened by the decision to drop what he called "a beloved sport."

"It's the IOC trying to change the Olympics to make it more mainstream and more viewer-friendly instead of sticking to what they founded the Olympics on," Gardner told The Associated Press in a telephone interview from Logan, Utah.

The executive board of the International Olympic Committee reviewed the 26 sports on its summer program in order to remove one of them so it could add one later this year. It decided to cut wrestling and keep modern pentathlon — a sport that combines fencing, horse riding, swimming, running and shooting — and was considered to be the most likely to be dropped.

The board voted after reviewing a report by the IOC program commission report that analyzed 39 criteria, including TV ratings, ticket sales, anti-doping policy and global participation and popularity. With no official rankings or recommendations contained in the report, the final decision by the 15-member board was also subject to political, emotional and sentimental factors.

"This is a process of renewing and renovating the program for the Olympics," IOC spokesman Mark Adams said. "In the view of the executive board, this was the best program for the Olympic Games in 2020. It's not a case of what's wrong with wrestling; it is what's right with the 25 core sports."

According to IOC documents obtained by the AP, wrestling ranked "low" in several of the technical criteria, including popularity with the public at the London Games — just below 5 on a scale of 10. Wrestling sold 113,851 tickets in London out of 116,854 available.

Wrestling also ranked "low" in global TV audience with a maximum of 58.5 million viewers and an average of 23 million, the documents show. Internet hits and press coverage were also ranked as low.

NBC, which televises the Olympics in the U.S., declined comment.

The IOC also noted that FILA — the international wrestling federation — has no athletes on its decision-making bodies, no women's commission, no ethics rules for technical officials and no medical official on its executive board.

Modern pentathlon also ranked low in general popularity in London, with 5.2 out of 10. The sport also ranked low in all TV categories, with maximum viewership of 33.5 million and an average of 12.5 million.

FILA has 177 member nations, compared to 108 for modern pentathlon.

Modern pentathlon, which has been on the Olympic program since the 1912 Stockholm Games, was created by French baron Pierre de Coubertin, the founder of the modern Olympic movement.

It also benefited from the work of Juan Antonio Samaranch Jr., the son of the former IOC president who is a UIPM vice president and member of the IOC board.

"We were considered weak in some of the scores in the program commission report but strong in others," Samaranch told the AP. "We played our cards to the best of our ability and stressed the positives."

Klaus Schormann, president of governing body UIPM, lobbied hard to protect his sport's Olympic status and it paid off in the end.

"We have promised things and we have delivered," he said after Tuesday's decision. "That gives me a great feeling. It also gives me new energy to develop our sport further and never give up."

The IOC executive board will meet in May in St. Petersburg, Russia, to decide which sport or sports to propose for 2020 inclusion. The final vote will be made at the IOC session, or general assembly, in September in Buenos Aires, Argentina.

Wrestling will now join seven other sports in applying for 2020, but it is extremely unlikely that it would be voted back in so soon after being removed by the executive board.

The other sports vying for a single opening in 2020 are a combined bid from baseball and softball, karate, squash, roller sports, sport climbing, wakeboarding and wushu, a martial art.

"Today's decision is not final," Adams said. "The session is sovereign and the session will make the final decision."

Wrestling featured 344 athletes competing in 11 medal events in freestyle and seven in Greco-Roman at last year's London Olympics, with Russia dominating the podium but Iran and Azerbaijan making strong showings. Women's wrestling was added to the Olympics at the 2004 Athens Games.

Karelin noted in an interview with Vyes' Sport that Russians and Soviets have won 77 gold medals.

"It's understandable that a lot of people didn't like this," Karelin said. "I'm not a supporter of conspiracy theory, but it seems to me that the underlying cause here is obvious."

Tuesday's decision came via secret ballot over four rounds, with 14 members voting each time on which sport should not be included in the core group. IOC President Jacques Rogge did not vote.

Three sports were left in the final round: wrestling, field hockey and modern pentathlon. Eight members voted against wrestling and three each against the other two sports. Taekwondo and canoe kayaking survived the previous rounds.

"I was shocked," said IOC board member Rene Fasel of Switzerland.

"It was an extremely difficult decision to take," added IOC Vice President Thomas Bach of Germany. "The motivation of every member is never based on a single reason. There are always several reasons. It was a secret vote. There will always be criticism, but I think the great majority will understand that we took a decision based on facts and for the modernization of the Olympic Games."

Wrestling was featured in the first modern Olympics in Athens in 1896. Along with Russia's Karelin, it has produced such American stars as Gardner, Bruce Baumgartner, Jeff Blatnick and Jordan Burroughs.

U.S. Olympic Committee CEO Scott Blackmun also expressed surprise at the IOC decision, citing "the history and tradition of wrestling, and its popularity and universality."

"It is important to remember that today's action is a recommendation, and we hope that there will be a meaningful opportunity to discuss the important role that wrestling plays in the sports landscape both in the United States and around the world," Blackmun said in a statement. "In the meantime, we will fully support USA Wrestling and its athletes."

FILA said in a statement that it was "greatly astonished" by the decision, adding that the federation "will take all necessary measures to convince the IOC executive board and IOC members of the aberration of such decision against one of the founding sports of the ancient and modern Olympic Games."

It said it has always complied with IOC regulations and is represented in 180 countries, with wrestling the national sport in some of them.

The federation, which is headed by Raphael Martinetti and based in Corsier-sur-Vevey, Switzerland, said it would meet next week in Thailand to discuss the matter.

Gardner cited wrestling's worldwide popularity and urged a campaign to keep it in the Olympics.

"It just seems like wrestling — if we don't fight, we're going to die," he said. "At this point, it's time for everybody to man up and support the program."

The decision hit hard in Russia, which has long been a power in the sport.

Mikhail Mamiashvili, president of the Russian Wrestling Federation, suggested FILA had not done enough to keep the sport in the games.

"We want to hear what was done to prevent this issue from even being discussed at the board," he said on the Rossiya TV channel.

In comments carried by ITAR-Tass, Mamiashvili added: "I can say for sure that the roots of this problem is at the FILA. I believe that Martinetti's task was to work hard, socialize and defend wrestling's place before the IOC."

Alexander Leipold, a 2000 Olympic champion from Germany and former freestyle German team coach, said he was shocked.

"We are a technical, tactical martial sport where the aim is not to harm the opponent," he said. "Competing at the Olympics is the greatest for an athlete."

Wrestling's long history in the Olympics has featured some top names and moments:

— Karelin won the super-heavyweight gold in Greco-Roman over three straight Olympics — 1988, 1992 and 1996 — until his streak was ended by Gardner, who beat him for the gold in 2000.

— Baumgartner won four Olympic medals, including golds in 1984 and 1992.

— Blatnick overcame cancer to win gold in Greco-Roman at the 1984 Los Angeles Games, bursting into tears after the match. Blatnick died last year at age 55.

— Burroughs emerged as the star of the sport in London, where he won the 74-kilogram gold.

The last sports removed from the Olympics were baseball and softball, voted out by the IOC in 2005 and off the program since the 2008 Beijing Games. Golf and rugby will be joining the program at the 2016 Games in Rio.

Among those in Lausanne were the leaders of the recently created World Baseball Softball Confederation. The two sports agreed last year to merge in a joint bid to return to the games.

Don Porter, the American who heads international softball, and Riccardo Fraccari, the Italian who leads baseball, are working out the final details of their unified body ahead of their presentation to the IOC in May.

A major hurdle remains the lack of a commitment from Major League Baseball to release top players for the Olympics.

Porter and Fraccari said they hope to have another meeting with MLB officials in April in Tokyo.

"The next thing is to sit down with them and see how they can help us," Porter said. "It all depends on the timing, the timing of the season. It's not an easy decision to allow players a week off."

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Associated Press writers Lynn Berry in Moscow and Luke Meredith in Des Moines, Iowa, contributed to this story.

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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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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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North Korea Conducts Nuclear Test

Lee Jin-Man/Associated Press

A South Korean watched news reporting about a possible nuclear test conducted by North Korea on a TV screen in Seoul on Tuesday.

WASHINGTON — North Korea confirmed on Tuesday that it had conducted its third, long-threatened nuclear test, according to the official KCNA news service, posing a new challenge for the Obama administration in its effort to keep the country from becoming a full-fledged nuclear power.

The KCNA said it used a “miniaturized and lighter nuclear device with greater explosive force than previously” and that the test “did not pose any negative impact on the surrounding ecological environment.”

The test led to a crescendo of international condemnation Tuesday, with President Obama calling for “swift and credible action by the international community” against North Korea, and Russia, Britain, South Korea and the United Nations echoing the U.S. tone. The United Nations Security Council scheduled an emergency meeting at 9 a.m. New York time to take up the matter.

Preliminary estimates suggested a test far larger than the previous two conducted by the North, though probably less powerful than the first bomb the United States dropped on Japan, in Hiroshima, in 1945. The Russian defense ministry was quoted as saying the blast surpassed 7 kilotons; the Hiroshima bomb had an explosive yield of 15 kilotons.

The test is the first under the country’s new leader, Kim Jong-un, and an open act of defiance to the Chinese, who urged the young leader not to risk open confrontation by setting off the weapon. In the past few days a Chinese newspaper that is often reflective of the government’s thinking said the North would “pay a heavy price” if it proceeded with the test. But it was unclear how China would act at the United Nations Security Council, which scheduled an emergency session as news of the blast played out.

The United Nations secretary-general Ban Ki-moon, condemned the test in a statement Tuesday.

The Obama administration has already threatened to take additional action to penalize the North through the United Nations in the event of a test. But the fact is that there are few sanctions left to apply against the most unpredictable country in Asia. The only penalty that would truly hurt the North would be a cutoff of oil and other aid from China. And until now, despite issuing warnings, the Chinese have feared instability and chaos in the North more than its growing nuclear and missile capability, and the Chinese leadership has refused to participate in sanctions.

Mr. Kim, believed to be about 29, appears to be betting that even a third test would not change the Chinese calculus.

The test set off a scramble among Washington’s Asian allies to assess what the North Koreans had done.

The United States sent aloft aircraft equipped with delicate sensors that may, depending on the winds, be able to determine whether it was a plutonium or uranium weapon. The Japanese defense minister, Itsunori Onodera, said Japan had ordered the dispatch of an Air Self-Defense Force jet to monitor for radioactivity in Japanese airspace.

Japan’s new prime minister, Shinzo Abe, told Parliament that “based on precedents, Japan believes that this quake was triggered by a North Korean nuclear test,” and said the country was considering “its own actions, including sanctions, to resolve this and other issues.”

But the threat may be largely empty, because trade is limited and the United States and its allies have refrained from a naval blockade of North Korea or other steps that could revive open conflict, which has been avoided on the Korean Peninsula since an armistice was declared 60 years ago.

It may take days or weeks to determine independently if the test, was successful. American officials will also be looking for signs of whether the North, for the first time, conducted a test of a uranium weapon, based on a uranium enrichment capability it has been pursuing for a decade. The past two tests used plutonium, reprocessed from one of the country’s now-defunct nuclear reactors. While the country has only enough plutonium for a half-dozen or so bombs, it can produce enriched uranium well into the future.

No country is more interested in the results of the North’s nuclear program, or the Western reaction, than Iran, which is pursuing its own uranium enrichment program. The two countries have long cooperated on missile technology, and many intelligence officials believe they share nuclear knowledge as well, though so far there is no hard evidence.

David E. Sanger reported from Washington, and Choe Sang-hun reported from Seoul, South Korea. Jane Perlez contributed reporting from Beijing and Hiroko Tabuchi from Tokyo.

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Mullens, Bobcats end Celtics' win streak 94-91

CHARLOTTE, N.C. (AP) — All in all, Monday proved to be a painful night for the Boston Celtics.

Not only did the Celtics have their seven-game losing streak snapped at the hands of the NBA's worst team, but they might have suffered yet another costly injury in their 94-91 loss to the Charlotte Bobcats.

Backup guard Leandro Barbosa, who has seen increased playing time since the season-ending injury to Rajon Rondo, injured his left knee late in the third quarter and had to be carried to the locker room by a trainer and teammate.

Coach Doc Rivers said Barbosa will have an MRI on Tuesday.

"It doesn't look great but we'll see," Rivers said.

In the seven games since Rondo's injury Barbosa had averaged nine points while playing an average of 22.5 minutes. The Celtics had won all seven games.

All of that came crashing down Monday night.

This night belonged to Charlotte's unheralded big man, Byron Mullens.

The four-year NBA veteran turned in a career game with 25 points and 18 rebounds as the Bobcats snapped a seven-game losing streak.

The 7-foot Mullens hit 10 of 16 shots from the field, including 4 of 5 from 3-point range. Ramon Sessions had 19 points for the Bobcats, including the go-ahead jumper from 18 feet with 25.7 seconds left. Kemba Walker had 18 points, six assists and six rebounds, and Gerald Henderson chipped in with 16 points.

Mullens was playing his fifth game after missing 19 with an ankle injury.

"It's big time," Walker said of Mullens' effort. "We need that from him. We need that from Byron and he can do it. We know he can do it every night. He is very capable. When he has big games like that, you know, I think that gives us a much better chance."

Mullens said he was more pleased with his rebounding than his scoring "because that is not what I'm known for.

"I just have to show the league and this organization that I can rebound," he said.

Kevin Garnett had 16 points and 13 rebounds for the Celtics, but missed a key 18-footer that would have given Boston the lead late in the game. Paul Pierce and Avery Bradley had chances to send the game into overtime in the final seconds, but missed open 3-pointers.

Jeff Green had 18 points for the Celtics and Pierce finished with 13 points, eight assists and eight rebounds.

"We had a win streak going and we had momentum going," Celtics guard Courtney Lee said. "We wanted finish out the rest of these games going into the (All-Star) break. So it's definitely a letdown. This one hurts more because we had the lead with one minute to go."

It was a back-and-forth game throughout.

After Henderson gave the Bobcats an 85-84 lead with 3:58 remaining, Jason Terry made a 3 from the wing and Garnett followed with a turnaround jumper in the lane to push the Boston lead to four.

It appeared as though the Bobcats were on their way to another fourth quarter collapse.

But trailing by four, Henderson hit a 3-point with 1:01 left. After Bradley missed an open jumper, Sessions came free off a screen and knocked down an 18-footer to give the Bobcats the lead with 25.7 seconds remaining.

The Celtics called timeout but Garnett missed from the left wing. Mullens grabbed his 18th rebound and the Walker made a pair of key free throws to give the Bobcats a three-point lead with 14.8 seconds left.

Boston set up an inbounds play and Pierce got an open look but missed. He grabbed his own rebound and dished out to the wing for Bradley, but he missed a 3 as time expired.

Boston's loss came after a triple overtime win against Denver on Thursday night, but the Celtics refused to use fatigue as an excuse.

"We put that one behind us," Green said.

As he'd planned to do before the game, Rivers went deep into his bench in the first half with 10 players seeing at least 10 minutes of action.

The Bobcats battled back in the third quarter behind 12 points from Mullens to take a 75-72 lead into the fourth. Mullens, who scored Charlotte's first 10 points of the game, did most of his damage from outside, knocking down 3-pointers and turnaround jumpers, showing great touch for a big man.

"Byron was as good as you can get in the NBA statistically in many ways," Bobcats coach Mike Dunlap said. "He's still young. He's growing. ... He's a different player because he was able to take a res. He's got live legs and he's able to see the game."

NOTES: Pierce scored in double figures for the 50th game this season. ... Bobcats center Bismack Biyombo was a force inside on the defensive end blocking four shots and grabbing seven defensive rebounds.

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