A new Nike+ “pressure sensor” is coming to Nike basketball and training shoes. The sensors will track data about wearers’ movements and transmit it wirelessly to their iPhones. The enhanced basketball shoes are meant to track the movements of players during practice sessions and games, including (but not limited to) how high the wearers jump. The training shoes are meant for casual and competitive athletes involved in any intense fitness activity.

Nike has been adding sensors to its athletic gear since 2006, though some of the products send data to an iPod or accompanying fitness watch rather than to a smartphone. The company says the Nike+ community has grown to more than six million “digitally connected” athletes.

Last month, Nike introduced the Nike+ FuelBand, a lightweight rubber wristband meant to be worn all the time to track fitness levels, which are measured in a Nike-branded activity currency called NikeFuel.

With these new basketball and training shoes, Nike says, workout statistics can be shared with friends on social networks. They also offer a “showcase” mode, which allows wearers to superimpose their live data onto a video that can then be shared with friends. So now, when a heated debate arises about who jumped higher on the court, you can take it inside, to Facebook.

A couple of unanswered questions — which I’ll ask Nike in a short while, and update as needed — is whether the sensor uses Bluetooth or another kind of wireless technology to transmit the data, as well as how far the reach of the sensor is. Most casual basketball players I know wouldn’t want to carry their smartphones in their pockets while playing (and I’m imagining it’s the same case with pro players). So would the user have to head to the sidelines or locker room and be within a certain proximity of his or her phone to transmit the data? Or does the data sync automatically?

And I’m curious to hear more about how verticals are actually measured. For example, if one foot edges higher than another, is the ultimate measurement an average of the two verticals? Or is it from the foot that got higher?

The company’s first sensor-enabled basketball shoe will be the Nike Hyperdunk+, which will cost $250 and hit stores this June. The first training shoes that work on the Nike+ system will be the Lunar Hyper Workout+ for women and the Lunar TR 1+ for men.

Nike has said LeBron James will wear the Nike Hyperdunk+ shoes this summer at the London Olympics.

Update: Nike’s vice president of digital sport, Stefan Olander, offered some more details on how the new pressure sensor works.

It reads four key pressure points in the foot to track when the feet leave the ground, Olander said. That data is combined with accelerometer technology to measure gravity and overall movement.

While data transmission in the “old” Nike+ sensors and running sneakers is enabled through Nike’s proprietary radio protocol, the latest Nike+ sensors use a new kind of Bluetooth technology that is said to be faster — and saps less power from connected devices. The data is stored locally on the sensor, and users can (wirelessly) upload the data to their iPhones when they’re done with their basketball or training session.

Also, the new pressure sensors are put into both left and right sneakers — unlike earlier versions of Nike+ sensors, which slipped into just one shoe — to more accurately measure the wearer’s movements. Whether the user takes off from the left foot or right foot — for example, when shooting a layup or attempting to dunk — Nike knows the timing of the foot pressure; the company claims it has created an algorithm that is more than 96 percent accurate in measuring jumps.

I wasn’t at today’s press event, but here are some tweets from those who were, including, naturally, Nike:

Improve every time you step on the court or in the gym. Introducing Nike+ Basketball & Nike+ Training #innovate http://t.co/7dsnBBwq

February 22, 2012 8:23 am via Nike PublisherReplyRetweetFavorite

@Nike

Nike

Nike has just unveiled a Hyperdunk shoe with a pressure sensor that tracks every move & allows you to upload it.

February 22, 2012 8:21 am via Twitter for iPhoneReplyRetweetFavorite

@darrenrovell

darren rovell

#Nike is arguing that it will bring the power of its own lab to any athlete through technology. I like the idea of the connected athlete.

February 22, 2012 8:18 am via Twitter for iPadReplyRetweetFavorite

@jeffjarvis

Jeff Jarvis

Nike+ will tell you how high you jumped when you okay bball!!! That’s unreal!!

February 22, 2012 8:23 am via Twitter for iPhoneReplyRetweetFavorite

@omid

Omid Ashtari

Here’s a promotional YouTube video featuring Mr. James himself, showing off the sneakers and how another player’s vertical data is transmitted to the iPhone:

According to numerous sources inside and outside the company, Yahoo is poised to slam dunk–I apologize, but sports puns are so easy–an acquisition of an online sports site this week.

And, predicted several of those sources, it is most likely to be San Francisco-based Citizen Sports, a maker of popular apps and games that allow fans to interact on the Apple (AAPL) iPhone and Facebook.

Interestingly, Yahoo (YHOO) CEO Carol Bartz is the keynote speaker at the high-profile sports business conference IMG World Sports Congress Wednesday morning in Los Angeles.

There is a plethora of interesting Web sports sites for Yahoo to choose from, including Yardbarker, SB Nation and Rotowire.

With Yahoo’s strong sports content business, especially in fantasy sports and news, and Bartz’s recent statements about making smaller talent and tech acquisitions–as well as the company’s recent focus on social networking and mobile integration–Citizen Sports is a perfect choice.

Citizen Sports started off in 2005 as ProTrade, an “athlete stock market entertainment company,” with $10 million from Kleiner Perkins Caufield & Byers partners Kevin Compton and Doug Mackenzie through Radar Ventures.

Other investors included Kleiner Perkins partner Will Hearst, said the Citizen Sports Web site, “as well as major sports figures, including former Dallas Cowboys quarterback and three-time Super Bowl champ Troy Aikman; Arizona Diamondbacks General Partner Jeff Moorad; legendary NFL Hall of Fame coach Bill Walsh; and Northgate Capital Venture founder Brent Jones, the former all-pro San Francisco 49ers tight end.”

But the site has morphed into an innovative digital enabler of interaction among fans of all kinds of sports, via its fantasy sports games and Sportacular iPhone app, as well as numerous apps on Facebook.

It also has tight relationships with Sports Illustrated magazine and other sports partners.

Most interesting is that one of its co-founders, Jeff Ma, was one of the members of the infamous MIT blackjack team, made famous in the book, “Bringing Down the House” and the film, “21.”

It is unclear how much Citizen Sports would sell for, but estimates put its price at about $40 to $50 million.

Both Citizen Sports and Yahoo declined to comment.