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

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

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

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

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

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

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

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

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

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

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

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

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Vintage piano given Valentine's Day deadline

HALF MOON BAY, Calif. — The piano was delivered to its bluff-top perch under cover of fog nearly two weeks ago. It is scheduled to leave this coastal enclave in a burst of flames on Sunday.

In between the fog and the fire, musician and sculptor Mauro Ffortissimo has been treating his neighbors to an illicit outdoor concert series grandly dubbed Sunset Piano. Chopin, Debussy, a tango or two. The performances are timed to end the moment the sun sinks below the horizon.

He plays to cyclists and dog walkers, babies in strollers, his landlady in a folding chair, the charmed, the perplexed. Every night the battered baby grand has sounded just a little bit worse as the elements erode the aging, al fresco instrument. Every night, the audience has grown.

Ffortissimo (not his real name, but you probably figured that out already) had hoped to serenade the residents of Half Moon Bay for a month. But it didn't take long for reality to intrude on the 50-year-old artist's well-laid plans.

Two days after Ffortissimo and friends rolled the piano out to a scenic spit of city land, a code enforcement officer sent a warning via email. Someone had complained.

No permit, no piano.

The 90-year-old Estey "appears to be an unauthorized encroachment onto public property," wrote Lamonte Mack. If you can't prove the installation is authorized, he told Ffortissimo, "please remove the piano — and platform — within 10 (ten) days."

That made the deadline Valentine's Day, an occasion to celebrate love, if not misplaced musical instruments.

The artist legally known as Mauro Dinucci has taken the bad news in stride. Asked about the end of the piano during Tuesday night's crowded concert, he crowed: "Woo, hoo! Valentine's Day! Bring chocolate!" and promised that "before we burn this baby, we give it one last boat ride."

Thursday will be the piano's last scheduled bluff-side concert along the Coastside Trail at the end of Kelly Avenue. Friday, Ffortissimo said, he has been invited to play the instrument at the Half Moon Bay Yacht Club.

Saturday he'll give a sunset performance on the water, a nod to the piano's earlier owners who once sent it from California to Panama and back by sea. Sunday he plans to set the piano ablaze in the flower-strewn field behind his studio.

"The idea of the burning," Ffortissimo said, "is a cremation, to liberate the piano from its physical form … I just hope it won't be a 'Spare the Air' day."

Not everyone is as happy as Ffortissimo about the piano's upcoming freedom.

Mayor Rick Kowalczyk, who has yet to hear the Sunset Piano himself, said he was trying to "see if I can't get something done in the short term to allow Mauro to stay." Kicking the Estey off of the bluff, he said, "feels a little bit like a child has a lemonade stand and the city shuts it down."

On Tuesday evening, more than 100 music lovers gathered round as the sun — and the temperature — dropped. Two women danced together on the grass. Wine was sipped and beer chugged. Children ate cold pizza. Shorebirds glided by.

Far away from Half Moon Bay, President Obama was preparing to give his State of the Union address. Christopher Dorner was thought to be shooting it out with police.

But here on a bluff overlooking the Pacific Ocean, Susan Swanson of Redwood City poured white wine from a blue metal flask as Ffortissimo played Albinoni's "Adagio in G Minor." She'd read about the piano performance in the local newspaper, she said, "and it's the kind of news I like to read — good news.

"This to me is everything," said the trying-to-retire office manager. "It's a perfect moment. Once in a lifetime maybe. It's so odd, isn't it?"

maria.laganga@latimes.com

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Tesla Driving Logs Contradict <em>New York Times</em> Claims

Data released by Tesla Motors late Wednesday night directly contradicts a damning review of the automaker’s Model S sedan by the New York Times.

The data, pulled directly from the electric sedan’s on-board computer, claims that New York Times reporter John M. Broder never ran out of energy during his extended drive of the Model S, despite his account to the contrary.

Broder’s trip in the Model S began outside of Washington D.C., up to Norwich, CT and then down to Milford, CT over the course of two days. The drive was intended as a way to evaluate Tesla’s newly installed Supercharger stations, which allow Model S owners to top up their batteries for free at solar-powered charging stations lining major thoroughfares along the east and west coasts.

According to Tesla, Broder was given explicit instructions for his drive: keep the speed at 55 mph and turn down the climate control. Broder claims to have set the cruise control at 54 mph and at one point writes he, “limped along at about 45 miles per hour.” However, the logs released by Tesla show that he drove at speeds ranging from 65 to 81 mph, and kept the interior temperature at 72 degrees, increasing it to 74 degrees at one point.

Tesla’s data claims that Broder never completely charged the Model S during three separate charging sessions, including one charge before the final leg of his trip, when Broder disconnected the charger with an indicated range of 32 miles, despite planning to drive 61 miles. Additionally, Broder claims to have charged for 58 minutes during the second leg of his trip, although Tesla’s data alleges it was only connected to the Supercharger for 47 minutes.

While driving on the highway, Broder says the Model S’ display informed him that it was about to shut the car down. “I was able to coast down an exit ramp in Branford, Conn., before the car made good on its threat,” Broder describes in his story.

According to Tesla, the Model S never shut down as was implied by Broder – he simply pulled over. Tesla claims that its “State of Charge” log shows that the battery never ran out of energy at any point during his trip.

The automaker is also questioning the length of a trip Broder made through Manhattan, reportedly giving his brother a ride in the car, as well claiming that the writer drove around in circles outside a Supercharger station for malicious reasons.

Tesla’s data dump comes five days after Broder’s report appeared on the New York Times site. Three days later, Tesla co-founder and CEO, Elon Musk, took to Twitter to refute the story, going so far as to call the New York Times‘ piece a “fake“.

The chemistry of the lithium-ion batteries in the Model S are affected by cold temperatures – especially the sub-freezing temps Broder experienced during his drive – which would reduce the overall range of Tesla’s electric sedan.

In an earlier statement released by the newspaper, the Times stood behind Broder’s portrayal of the drive, calling it “completely factual” and stating that “[a]ny suggestion that the account was ‘fake’ is, of course, flatly untrue.” Calls for a follow-up statement from the Times and Mr. Broder have gone unanswered.

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Epic to pull song with offending Lil Wayne lyric

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

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

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

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

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

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

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

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

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

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

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

___

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

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Use of Morning-After Pill Is Rising, Report Says

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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Christopher Dorner shootout: Body found in burned cabin

There were conflicting reports tonight about whether a body was located inside the burned-out cabin Tuesday night where Christopher Jordan Dorner was believed to have kept law enforcement authorities at bay.

Several sources told The Times and many other news organizations that a body was located in the rubble. But LAPD officials just said that the cabin is still too hot to search and no body has been found.

Another update is expected within the next hour from law enforcement officers near the scene, and officials said they might have an update clarifying the confusion.

PHOTOS: Manhunt for ex-LAPD officer

As authorities moved into the cabin earlier Tuesday, they heard a single gunshot.

According to a law enforcement source, police had broken down windows, fired tear gas into the cabin and blasted over a loud speaker, urging Dorner to surrender. When they got no response, police deployed a vehicle to rip down the walls of the cabin "one by one, like peeling an onion," a law enforcement official said.

By the time they got to the last wall, authorities heard a single gunshot, the source said. Then flames began to spread through the structure, and gunshots, probably set off by the fire, were heard. 

PHOTOS: Manhunt for ex-LAPD officer

As darkness descended on the mountainside, Dorner's body had not been found, authorities said. Police were planning to focus their search in the basement area, the source said.

Earlier Tuesday, a tall plume of smoke was rising as flames consumed the wood-paneled cabin. Hundreds of law enforcement personnel had swooped down on the site near Big Bear after the gun battles between Dorner and officers that broke out in the snow-covered mountains where the fugitive had been eluding a massive manhunt since his truck was found burning in the area late last week.

Law enforcement personnel in military-style gear and armed with high-powered weapons took up positions in the heavily forested area as the tense standoff progressed. 

One San Bernardino County sheriff's deputy died after he and another deputy were wounded in an exchange of gunfire outside the cabin in which hundreds of rounds were fired, sources told The Times. The deputy was airlifted to Loma Linda University Medical Center, where he died of his wounds.

The afternoon gun battle was part of a quickly changing situation that began after Dorner allegedly broke into a home, tied up a couple and held them hostage. He then stole a silver pickup truck, sources said.

Then Dorner was allegedly spotted by a state Fish and Wildlife officer in the pickup truck, sources said. A vehicle-to-vehicle shootout ensued. The officer's vehicle was peppered with multiple rounds, according to authorities.

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Executive Order Aims to Facilitate Sharing of Information on Threats

President Barack Obama signed an executive order on Tuesday designed to make it easier to disseminate classified information on threats against critical infrastructure systems and to lay the groundwork for obtaining information from the private sector that would help the government protect critical infrastructures in the U.S.

The order, which runs eight pages (.pdf), directs the Attorney General’s office, the office of Homeland Security Secretary Janet Napolitano and the Director of National Intelligence to issue instructions to their agencies that would “ensure the timely production of unclassified reports of cyberthreats to the U.S. homeland that identify a specific targeted entity” to Congress and also develop a program for providing “classified cyber threat and technical information from the Government to eligible critical infrastructure companies or commercial service providers that offer security services to critical infrastructure,” according to the document.

To that end, the order also calls for the government to expedite security clearances to appropriate personnel employed by critical infrastructure owners and operators, so that they can receive information necessary to protect their systems.

“It is the policy of the United States Government to increase the volume, timeliness, and quality of cyber threat information shared with U.S. private sector entities so that these entities may better protect and defend themselves against cyber threats,” the order states.

The order, published in conjunction with a new Presidential Directive on cybersecurity (.pdf), follows numerous failed attempts by Capitol Hill to pass controversial cybersecurity legislation that would have given private companies legal immunity to share information with the government.

The order still allows the private sector to share information with the government, but references established safeguards — such as the Fair Information Practice Principles — for protecting the privacy of customers whose information is shared and also carries some built-in limitations for the kind of information that companies will likely share. The order requires DHS’s chief privacy officer and its officer for civil rights and civil liberties to assess the privacy and civil liberties risks of the programs.

Civil liberties advocates praised the executive order in this regard, but said they will withhold judgment until they see how the information-sharing gets played out in practice.

“A lot of what this shows is that the president can do a lot without cybersecurity legislation,” said Mark Jaycox, policy analyst and legislative assistant for the Electronic Frontier Foundation, who points out that the executive order satisfies the need for information sharing without the privacy problems that existed under legislative proposals where loopholes would have allowed companies to dump large amounts of data on the government in an effort to obtain legal immunities. Without those immunities, companies will by nature be more circumspect about what they provide the government, thus limiting what they hand over Jaycox said.

“An [executive order] can’t grant broad immunities to companies … so it will tighten the information that can be shared, and the government won’t be on the receiving end of tons of tons of information,” Jaycox said. “Companies will be more mindful about what they share.”

Although the order comes after a number of failed attempts by Congress last year to pass cybersecurity legislation, the White House has indicated that it doesn’t see the executive order as a substitute for legislation, and the order even indicates that further legislation is not ruled out in addressing the critical infrastructure issue.

Not everyone is happy with the order, however. Sen. Charles E. Grassley (R-Iowa) told the Washington Post that the president was out of line in bypassing legislation.

“It is a very dangerous road he’s going down contrary to the spirit of the Constitution,” Sen. Grassley said. “Just because Congress doesn’t act doesn’t mean the president has a right to act.”

The Cyber Intelligence Sharing and Protection Act, which passed the House last year but failed to gain support in the Senate, was one piece of legislation that garnered a lot of criticism from civil liberties groups who were happy to see it fail. EFF and others criticized the bill for failing to provide enough safeguards to protect the digital privacy of customers when private entities such as ISPs and others shared threat information with the government.

CISPA would have allowed companies to share sensitive and personal data with the National Security Agency and other government agencies without requiring companies to make reasonable efforts to protect their customers’ privacy. The bill also failed to adequately define how the government could use the data, saying only that it would be used for “national security” purposes.

House Intelligence Committee Chairman Mike Rogers (R-Michigan) and Ranking Member C.A. Dutch Ruppersberger (D-Maryland) plan on reintroducing CISPA this week.

Critical infrastructure sectors include chemical, communications, dams, critical manufacturing, emergency services, food and agriculture, energy, defense industrial base, healthcare and public health, government facilities, water and wastewater and transportation, among a few others.

DHS currently oversees the National Cybersecurity and Communications Integration Center, a 24-hour watch center tied in with other federal watch centers that parses threat information that comes in to the center and monitors government civilian networks for signs of cyber threats. DHS, along with the Department of Energy, also operates the Industrial Control System – Computer Emergency Readiness Team, which helps assess industrial control systems for vulnerabilities and maintains a flyaway team to assist critical infrastructure owners in the private sector with responding to suspected attacks on their networks.

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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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