Well: Ask Well: Swimming to Ease Back Pain

Many people find that recreational swimming helps ease back pain, and there is research to back that up. But some strokes may be better than others.

An advantage to exercising in a pool is that the buoyancy of the water takes stress off the joints. At the same time, swimming and other aquatic exercises can strengthen back and core muscles.

That said, it does not mean that everyone with a case of back pain should jump in a pool, said Dr. Scott A. Rodeo, a team physician for U.S.A. Olympic Swimming at the last three Olympic Games. Back pain can have a number of potential causes, some that require more caution than others. So the first thing to do is to get a careful evaluation and diagnosis. A doctor might recommend working with a physical therapist and starting off with standing exercises in the pool that involve bands and balls to strengthen the core and lower back muscles.

If you are cleared to swim, and just starting for the first time, pay close attention to your technique. Work with a coach or trainer if necessary. It may also be a good idea to start with the breaststroke, because the butterfly and freestyle strokes involve more trunk rotation. The backstroke is another good option, said Dr. Rodeo, who is co-chief of the sports medicine and shoulder service at the Hospital for Special Surgery in New York.

“With all the other strokes, you have the potential for some spine hyperextension,” Dr. Rodeo said. “With the backstroke, being on your back, you don’t have as much hyperextension.”

Like any activity, begin gradually, swimming perhaps twice a week at first and then progressing slowly over four to six weeks, he said. In one study, Japanese researchers looked at 35 people with low back pain who were enrolled in an aquatic exercise program, which included swimming and walking in a pool. Almost all of the patients showed improvements after six months, but the researchers found that those who participated at least twice weekly showed more significant improvements than those who went only once a week. “The improvement in physical score was independent of the initial ability in swimming,” they wrote.

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Bits Blog: How Lightning Tightens Apple's Control Over Accessories

When the iPhone 5 was released in September with the new Lightning connection port, all those docks and accessories that longtime Apple customers had been collecting for years were suddenly obsolete. But Lightning-compatible accessories have been trickling in more slowly than the typical flood of Apple accessories that comes after a new iPhone release. Why?

One challenge, according to a person briefed on Apple’s plans who was not approved to discuss them publicly, is that the iPhone 5 is more fundamentally different from previous versions of the device than new models usually are  — introducing a different overall size and shape as well as an engineering change. At the same time, with Lightning, Apple has made it harder for companies to avoid working with its own licensing program. Both of these factors have slowed the production of accessories.

Mophie, an accessory maker, shared some insight into Lightning and the overall process of making an Apple accessory. (This week it introduced the Helium, its first iPhone 5 case with a backup battery.) When a hardware maker signs up with Apple’s MFi Program, for companies that make accessories for Apple products, it orders a Lightning connector component from Apple to use in designing the accessory. The connectors have serial numbers for each accessory maker, and they contain authentication chips that communicate with the phones. When the company submits its accessory to Apple for testing, Apple can recognize the serial number.

“If you took this apart and put it in another product and Apple got a hold of it, they’d be able to see it’s from Mophie’s batch of Lightning connectors,” said Ross Howe, vice president of marketing for Mophie.

The chip inside the Lightning connector can be reverse engineered — copied by another company — but it probably would not work as well as one that came from Apple, Mr. Howe said. Apple could also theoretically issue software updates that would disable Lightning products that did not use its chips, he said.

What’s the benefit for Apple? The proprietary chip makes it more difficult for accessory makers to produce cheap knockoff products that are compatible with Lightning, which could potentially tarnish the iPhone brand. Also, it pushes accessory makers to pay Apple the licensing fees to be part of the MFi program.

“That’s one thing Apple is good at: controlling the user experience from end to end,” Mr. Howe said. “If you’re buying something in an Apple store, it’s gone through all this rigorous testing.”

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Oscar Pistorius, Facing Murder Charge, Breaks Down




Track Star Charged in Killing:
Michael Sokolove, a writer who profiled Oscar Pistorius, discusses the dark turn for the South African runner.







JOHANNESBURG — Oscar Pistorius, the double amputee track star accused of fatally shooting his girlfriend, appeared in tears at a courtroom in the South African capital Pretoria on Friday facing a single charge of murder.










Antoine De Ras/INLSA, via Associated Press

Oscar Pistorius on Friday broke down in court in Pretoria, South Africa.






Lucky Nxumalo/Agence France-Presse — Getty Images

Pistorius was charged with murder in the shooting death of his girlfriend, Reeva Steenkamp.






Both the prosecution and the defense asked magistrate Desmond Nair for a postponement of the bail hearing and the case was adjourned until Tuesday.


As lawyers and court officials debated whether the hearing should be televised, Mr. Pistorius held his head in his hands and sobbed. Prosecutor Gerrie Nel said the prosecution would bring a charge of "premeditated murder."


Mr. Pistorius did not speak to enter a plea and he will remain in custody until the case resumes on Feb. 19.


The accusation against the man nicknamed the Blade Runner stunned a nation that had seen him as a national hero who had overcome the acute challenge of being born without fibula bones; had both legs amputated below the knee as an infant; and yet became the first Paralympic sprinter to compete against able-bodied athletes at the Olympics in London last year.


Grim-faced and tired looking, Mr. Pistorius entered the court as news of events at his upmarket home in Pretoria eclipsed a State of the Nation address by President Jacob Zuma on Thursday evening and took up the front page headlines in many newspapers on Friday. “Golden Boy Loses Shine,” said one headline in The Sowetan.


The courtroom in Pretoria was packed and officials said no cameras would be allowed inside. Police officials have indicated that they will oppose an expected application for bail. Wearing a gray suit, Mr. Pistorius arrived for the hearing sitting in the back a police car, shielding his face.


Members of his family, also weeping, were in the courtroom when he appeared.


Early on Thursday morning, the police arrived at Mr. Pistorius’s house in a gated community in Pretoria to find his girlfriend, Reeva Steenkamp, 30, in a puddle of blood, dead from gunshot wounds. Before the day was out, Mr. Pistorius, 26, who ran on carbon-fiber blades that earned him his nickname, had been charged with murder.


Ms. Steenkamp was a model about to make her debut on a reality television show.


Early news reports said Mr. Pistorius, a gun enthusiast, had mistaken his girlfriend for an intruder. But police officers said that account came as a surprise to them. They also disclosed previous law enforcement complaints about domestic episodes at his home.


Mr. Pistorius won two gold medals and a silver at last September’s Paralympic Games in London. In the 2012 Olympics the month before, he reached the 400-meter semifinal and competed in the 4x400-meter relay.


In the Paralympics, Mr. Pistorius won individual gold, successfully defending his 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 came in second in the 200-meter race.


Lydia Polgreen reported from Johannesburg, and Alan Cowell from London. Mukelwa Hlatshwayo contributed reporting from Pretoria.



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DealBook: American and US Airways Announce Merger Deal

6:35 a.m. | Updated

Ending a yearlong courtship by US Airways, American Airlines agreed to merge with the smaller carrier, paving the way for the creation of the nation’s largest airline.

The boards of the companies have unanimously approved the deal, valued at $11 billion, according to a news release Thursday morning. A merger would bolster American’s domestic footprint, strengthen its presence in the Northeast and give it a bigger network to attract business travelers and corporate accounts.

Under the terms of the deal, US Airways’ shareholders will own 28 percent of the combined airline, while 72 percent of the stake will be held by AMR shareholders, creditors, labor unions and American employees.

The merger would create a rival with the size and breadth to compete against United Airlines and Delta Air Lines, which have grown through mergers of their own in recent years and are currently the biggest.

But while United and Delta went through bankruptcies and mergers over the last decade, American has been steadily losing ground while racking up losses that have totaled more than $12 billion since 2001. It was the last major airline to seek court protection to reorganize its business when it filed for bankruptcy in November 2011.

The wave of big mergers in the industry has created healthier and more profitable airlines that are now better able to invest in new planes and products, including Wi-Fi, individual entertainment screens and more comfortable seats for business passengers. But some consumer advocates said they worried that reducing the number of airlines would lead to higher fares over the long run and allow airlines to increase revenue by imposing new or higher fees.

The deal, which was completed in recent days, could be formalized as American leaves bankruptcy. W. Douglas Parker, the chairman and chief executive of US Airways, will take over as American’s chief executive. Thomas W. Horton, American’s current chairman and chief executive, will be chairman, though his tenure could be limited.

The merger still needs to pass several steps. It must be approved by American’s bankruptcy judge in New York. US Airways shareholders, who will also have to approve the deal.

In addition, it will be reviewed by the Justice Department’s antitrust division, though analysts expect regulators to clear the deal.

If approved, the nation’s top four airlines — American, United, Delta and Southwest Airlines — would control nearly 70 percent of the domestic market.

The merger is a victory for Mr. Parker. Over the last year, he has convinced American’s creditors that the carrier needed to expand its network to compete. In April, he won the critical backing of American’s three labor groups, which defied American’s management and publicly endorsed a deal with US Airways.

The biggest challenge for the merged company, which will be called American Airlines, will be to integrate operations over the next couple of years. That is no easy task since airline mergers are often rocky — involving complex technological systems, big reservation networks as well as large labor groups with different corporate cultures that all need to be seamlessly combined.

United angered passengers last year after a series of merger-related computer and reservation mistakes, and late and delayed flights.

Mr. Parker has done this before. In 2005, when he was the head of America West, he engineered a merger with the larger US Airways.

In this case, the merged American Airlines will still be based in Fort Worth and have a combined 94,000 employees, 950 planes, 6,500 daily flights, eight major hubs and total sales of nearly $39 billion. It would be the market leader on the East Coast, the Southwest and South America. But it would remain a smaller player in Europe, where United and Delta are stronger. The merger does little to bolster American’s presence in Asia, where it trails far behind its rivals.

American has major hubs in Dallas, Miami, Chicago, Los Angeles and New York. US Airways has hubs in Phoenix, Philadelphia and Charlotte, N.C., and has a big presence at Ronald Reagan National Airport in Washington.

In reviewing previous mergers, federal regulators have not focused on the overall size of the combined airline but instead looked at whether a merger would decrease competition in individual cities. To do so, regulators examine specific routes, or city-pairs, and look at whether a merger reduces the number of airlines there.

The last time the Justice Department challenged a merger was the proposed combination between United Airlines and US Airways in 2001. It rejected that on the ground that it would reduce consumer choice and possibly lead to higher fares.

Since then, the department has allowed a wave of big mergers that have reshaped the industry, said Alison Smith, a former antitrust official and now a partner in the law firm McDermott Will & Emery.

American and US Airways only have about 12 overlapping routes, a figure that is unlikely to set off regulatory opposition, she said. One problem, however, could come up at National Airport, where the combined carriers hold a market share of about 60 percent. There, regulators might request that American give up some takeoff and landing rights before approving the merger.

Regulators sought similar concessions from United at Newark Liberty International Airport after its merger with Continental Airlines.

It is also unclear whether American needs all of its combined hubs. Analysts pointed out that Phoenix was at risk because of its proximity to Dallas, since it makes little sense to have two big hubs so close to each other.

Despite the increased concentration, consumers can still expect to find vibrant competition, said William S. Swelbar, a research engineer at the Massachusetts Institute of Technology’s International Center for Air Transportation.

“We will have four very big, very vigorous competitors in the market,” he said.

Travelers are better served by bigger airlines offering more connecting flights and more destinations, analysts said. Consumers today can easily compare fares and shop for the cheapest flight online, which keeps airfares in check.

But Kevin Mitchell, chairman of the Business Travel Coalition, disagreed. He said that consumers would see few benefits to offset the merger’s negative impact — including “reduced competition, higher fares and fees and diminished service to small and midsize communities.”

Michael J. de la Merced contributed reporting.

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The New Old Age Blog: A New Commission: Time to Cheer or Yawn?

The fate of the Class Act, which would have established the nation’s first voluntary public long-term care insurance program, was sealed in 2011 when the Obama administration shut it down, essentially calling it unworkable.

As long as the language remained part of the Affordable Care Act, supporters allowed themselves to hope, or perhaps fantasize, that the administration might return to the subject. How to care for an aging population, and who pays for that and how, are questions that won’t go away.

But Congress quietly administered the coup de grâce last month, during the fiscal cliff negotiations. The budget deal stripped the Class Act language from the Affordable Care Act. R.I.P.

In its place — thanks to the intervention of Senator Jay Rockefeller, Democrat of West Virginia — the negotiators created a Commission on Long-Term Care, charged with developing plans for “a comprehensive, coordinated and high-quality system” ensuring long-term care for older adults and people with disabilities.

Its 15 members — three picks each for the president, the Senate majority and minority leaders, and the House speaker and minority leader — face a tight deadline. Within six months, they are supposed to recommend legislative or administrative actions, including actual legislative language. Then bills are to be introduced in both houses of Congress on the very next day they are in session.

Which sounds like urgency, but is it? Even Connie Garner, the longtime Kennedy staff member who directs the advocacy group called Advance Class, was skeptical. “What can you really do in six months?” she said. Actuaries and policy types had been working on the Class plan for 19 months before the plug was pulled. “And so what if you introduce a bill?” she went on. “You can introduce stuff and nothing happens.”

So when Advance Class held its monthly board meeting a few days after the Class Act officially bit the dust, Ms. Garner figured this push for a national long-term care approach was dead, along with her organization. She had prepared a valedictory, praising the group for at least putting the issue on the national agenda.

“But they said, ‘No, we’re going to keep Advance Class going; we’re going to fight the long fight,’ ” she recalled. So on we go.

Discouragingly, the commission has already hit delays: Its members were to be named within 30 days of the budget deal’s enactment, but only the Congressional Democrats have made appointments.

Senator Harry Reid, the majority leader, nominated a veteran health policy scholar, Judy Feder, who is now at the Georgetown University Public Policy Institute; the labor executive Laphonza Butler, who heads California’s United Long-Term Care Workers Union; and Javaid Anwar, a Nevada internist.

Representative Nancy Pelosi, the House minority leader, appointed Bruce Chernof, chief executive of the SCAN Foundation, which promotes quality care for the elderly; Judith Stein, founder of the Center for Medicare Advocacy; and George Vrandenburg, a retired corporate lawyer who has put his philanthropic muscle behind Alzheimer’s causes.

We have heard nothing yet from the White House or the Republican Congressional leadership.

Maybe that barely matters. “I can’t imagine anything coming out of this commission that won’t be totally forgotten a year from now,” said Jesse Slome, executive director of the American Association for Long-Term Care Insurance. “How many commissions have there been?”

Yet one thing that he and the proponents at Advance Class can agree on — maybe the only thing — is that this issue demands attention.

Otherwise, Mr. Slome says, we are stuck with what we have when it comes to older people who might need expensive care for 30 years, and disabled people who might need care for even longer. And what we have, he said, amounts to “a little here, a little there, a little Medicare, a lot of Medicaid, a little long-term care insurance and a lot of unpaid family caregiving.” (I would say very little long-term care insurance, and a vast amount of unpaid family care.)

Discussing the future of Medicare and Medicaid without including long-term care is pointless, Mr. Slome added. Ms. Garner notes that she meets frequently with Republicans and that they never dismiss the issue as unimportant.

Well, there’s a start.


Paula Span is the author of “When the Time Comes: Families With Aging Parents Share Their Struggles and Solutions.”

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The New Old Age Blog: A New Commission: Time to Cheer or Yawn?

The fate of the Class Act, which would have established the nation’s first voluntary public long-term care insurance program, was sealed in 2011 when the Obama administration shut it down, essentially calling it unworkable.

As long as the language remained part of the Affordable Care Act, supporters allowed themselves to hope, or perhaps fantasize, that the administration might return to the subject. How to care for an aging population, and who pays for that and how, are questions that won’t go away.

But Congress quietly administered the coup de grâce last month, during the fiscal cliff negotiations. The budget deal stripped the Class Act language from the Affordable Care Act. R.I.P.

In its place — thanks to the intervention of Senator Jay Rockefeller, Democrat of West Virginia — the negotiators created a Commission on Long-Term Care, charged with developing plans for “a comprehensive, coordinated and high-quality system” ensuring long-term care for older adults and people with disabilities.

Its 15 members — three picks each for the president, the Senate majority and minority leaders, and the House speaker and minority leader — face a tight deadline. Within six months, they are supposed to recommend legislative or administrative actions, including actual legislative language. Then bills are to be introduced in both houses of Congress on the very next day they are in session.

Which sounds like urgency, but is it? Even Connie Garner, the longtime Kennedy staff member who directs the advocacy group called Advance Class, was skeptical. “What can you really do in six months?” she said. Actuaries and policy types had been working on the Class plan for 19 months before the plug was pulled. “And so what if you introduce a bill?” she went on. “You can introduce stuff and nothing happens.”

So when Advance Class held its monthly board meeting a few days after the Class Act officially bit the dust, Ms. Garner figured this push for a national long-term care approach was dead, along with her organization. She had prepared a valedictory, praising the group for at least putting the issue on the national agenda.

“But they said, ‘No, we’re going to keep Advance Class going; we’re going to fight the long fight,’ ” she recalled. So on we go.

Discouragingly, the commission has already hit delays: Its members were to be named within 30 days of the budget deal’s enactment, but only the Congressional Democrats have made appointments.

Senator Harry Reid, the majority leader, nominated a veteran health policy scholar, Judy Feder, who is now at the Georgetown University Public Policy Institute; the labor executive Laphonza Butler, who heads California’s United Long-Term Care Workers Union; and Javaid Anwar, a Nevada internist.

Representative Nancy Pelosi, the House minority leader, appointed Bruce Chernof, chief executive of the SCAN Foundation, which promotes quality care for the elderly; Judith Stein, founder of the Center for Medicare Advocacy; and George Vrandenburg, a retired corporate lawyer who has put his philanthropic muscle behind Alzheimer’s causes.

We have heard nothing yet from the White House or the Republican Congressional leadership.

Maybe that barely matters. “I can’t imagine anything coming out of this commission that won’t be totally forgotten a year from now,” said Jesse Slome, executive director of the American Association for Long-Term Care Insurance. “How many commissions have there been?”

Yet one thing that he and the proponents at Advance Class can agree on — maybe the only thing — is that this issue demands attention.

Otherwise, Mr. Slome says, we are stuck with what we have when it comes to older people who might need expensive care for 30 years, and disabled people who might need care for even longer. And what we have, he said, amounts to “a little here, a little there, a little Medicare, a lot of Medicaid, a little long-term care insurance and a lot of unpaid family caregiving.” (I would say very little long-term care insurance, and a vast amount of unpaid family care.)

Discussing the future of Medicare and Medicaid without including long-term care is pointless, Mr. Slome added. Ms. Garner notes that she meets frequently with Republicans and that they never dismiss the issue as unimportant.

Well, there’s a start.


Paula Span is the author of “When the Time Comes: Families With Aging Parents Share Their Struggles and Solutions.”

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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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IHT Rendezvous: Hanging of Militant Raises Questions in India

In my latest column in the International Herald Tribune, I argue that the Indian justice system, which includes shoddy police investigations and the powerful influence of political calculations, is not competent nor fair enough to grant India the moral right to hang a man, assuming that any society can have such a right in the first place.

Page Two

Posts written by the IHT’s Page Two columnists.

On Saturday, a militant who is widely known in India as Afzal Guru, was hanged in a secret operation. The hanging, which was his punishment for assisting five terrorists who had attacked the Indian Parliament in 2001, has raised a number of issues, most of them questions that supporters of human rights have raised since 2004 when he was sentenced to death by the highest court in the land. They believe that he did not receive a fair trial, that he was a convenient scapegoat, that he was a minor player in a crime that the Indian state was not good enough to fully investigate, that he did not deserve to be hanged according to the evidence that was available.

They had solid reasons to say all this, but one of Afzal Guru’s misfortunes was that the liberal voice in India has progressively lost its power and influence because it has lost its credibility with the state, the news media and the fast changing Indian urban middle class.

In the past, when the liberals took on the state over dams or other developmental projects, or minority rights or the armed activities of tribal gangs that sought their own revolutions, they have been more preoccupied with maintaining their ideological positions and their love for the underdogs than with the practicality of hard facts. So, even though the Indian state’s handling of the Afzal Guru’s case was disgraceful, the voice of the liberals had become too feeble, dull and predictable to intimidate the state. The liberals are seeing their constituency shrink even in mainstream English journalism in India, and they have themselves to blame for this.

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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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