How Wearable Technology Works

The Move tank top monitors your body position during workouts and alerts you to poor alignment.
Image courtesy Electricfoxy

In the very recent past, using a computer meant sitting at a desk or toting around your laptop bag. These days, thanks to smartphones and an avalanche of tiny portable computing products, you can crunch bits and bytes anytime, anywhere. And soon, you may not even need to carry your gadgets -- they'll be integrated into your hat, your clothes and your eyeglasses. The age of wearable technology may finally be upon us.

For decades, engineers and dreamers have been conjuring ideas for wearable computers. But microprocessor speeds weren't always up to snuff and power concerns were paramount, because without power to bring them to life, electronics are just dead metal.


Now, with better batteries, ever-increasing processor speed, ceaseless Internet connectivity and clever software programming, wearable technology's potential seems not only realistic but unlimited.

Consider the possibilities. Your yoga outfit can monitor your form and provide instant feedback. Watches and jewelry can monitor you for a whole range of health conditions, from cardiovascular disease to bipolar disorder, and communicate alerts to you and your physician. Sensor- and camera-laden firefighting jackets track the vital signs and locations of squad members to keep them safe and to maximize tactical effectiveness.

Teenagers can keep tabs on their messages with Bluetooth rings. Don a pair of Google Glasses (complete with prescription lenses) and you can execute all sorts of smartphone-like activities. Even your dog can get in on the wearable computing trend. Attach a smart collar to Fido and you'll know if she's harassing squirrels all day or down in the doggie dumps.

Market pundits see money in wearable tech. Deloitte's technology prediction report forecast that companies would sell about 10 million units of these products in 2014, with smart glasses leading the way at sales of nearly $3 billion. Smartwatches and fitness bands should also continue to sell by the millions [source: Deloitte].

So wearables aren't just fringe technology anymore. Startups and established corporations alike are all interested in the revenue that could result from wearable products. Keep reading to see how you'll soon be donning your devices.


The Quantified Self

Google Glass is well-publicized, and its position in the spotlight has drawn both praise and derision.

The end goal of wearable technology is to make tasks easier, more efficient, more effective or simply more fun. All of these devices are part of the so-called quantified-self movement, which is about blending each aspect of your life with technology that continuously gathers and crunches data.

Whether you're consciously seeking to collect data regarding every moment of your life or you just want to track the metrics of your morning jog, wearable technology is sprawling into all sorts of products. Ultimately, they're all part of the Internet of things, an all-encompassing phrase that describes interconnected digital gadgets that log, report and control data from your body and across the planet.


Right now, smartphones are a linchpin in this system. Smartphones paired with the right app or hardware become a hub for hundreds of activities and purposes. Because they can send data to and from the Internet, they provide a way to integrate connectivity options into all sorts of wearable goods.

Google Glass is a prime example of the current evolution of wearable technology. Glass is a computer in the form of a pair of eyeglasses and includes an optical head-mounted display. In short, Glass does a lot of the things that your smartphone can do. For instance, you can use a voice command to display a map and then use your finger to swipe through driving directions. The Glass does have WiFi capability, but when you're out of range, you can switch to Bluetooth, which connects to the Internet via your smartphone.

It has GPS, a camera, a microphone and 16GB of internal flash memory (12 user accessible). You can conduct video calls, send pictures and video clips, check your e-mail, post to Facebook and Twitter and a whole lot more.

Glass, though, is just one well-publicized incarnation of wearable technology -- and it's still in testing. On the next page you'll delve into one of the biggest markets for body-mounted tech.


Body Trackers Galore

If you take a look around, you might notice lots of people wearing small pieces of tech to track their fitness, such as the Jawbone Up, Misfit Shine and Fitbit Flex (pictured here).

The term wearable technology implies that these devices rest on your body. So it's only natural that many of them focus on the wearer's health and fitness.

Sports watches are among the most established wearable tech. Often, these wristwatches come with integrated GPS to log the distance and time of your workout, and many versions will keep tabs on your heart rate, cadence and calories burned. Nowadays, the tech wizardry is getting more magical. With the correct sensor and power source, a wearable item can track just about any metric you want.


Imagine a bra that could monitor heat patterns and breast shape, serving as a watchdog against cancerous tumor development. Or sensor-laden socks that track form, weight distribution and other data during workouts. And underwear with built-in electrodes could stimulate the muscles of bed-bound patients, helping to reduce excruciating bed sores.

Soon, sensors may measure blood glucose levels, helping diabetics monitor their condition and preventing life-threatening situations. Digitized wristbands could warn food service or medical technicians when they haven't sufficiently washed their hands, which could prevent the spread of myriad diseases and improve public health.

Some products are already a reality, including Cityzen Smart Sensing fabric. "Smart" because it combines tiny sensors into a comfortable garment, which can be anything from mittens to pants, depending on the application. Connect the garment to a compact, battery-powered transmitter, turn on your smartphone's Bluetooth connection, and suddenly you have a customized body monitoring system.

The fabric communicates with an app on your phone to keep tabs on heart rate, respiration and metrics. Ultimately, the system notes how tired or stressed you are, and could even alert you to the onset of a medical problem. In spite of its high-tech nature, you can wash and iron the Smart Sensing fabric normally. Cityzen is even researching a way to recharge the battery by harnessing the rotating motion of your washing machine.


Wearing Your Fun

The PrioVR full body harness has 17 body and head sensors to translate body motion into gaming action.
© ROBYN BECK/AFP/Getty Images

For most people, fun is the hook that makes new technology worth investigating. Wearable technology promises entertainment galore.

Video games are bigger than ever, with cinematic appeal and wow-inducing special effects. Still, the games would be more immersive with more life-like control systems. That's what the PrioVR plans to deliver.


Depending on the model, you'll attach between eight and 17 inertial sensors to your body. As you play a game, the sensors correlate your real-life movements to your on-screen character. The wearable nature of PrioVR -- a gaming suit that players don for motion-capture action gaming -- advertises more accurate movement than data captured from remote cameras like the Kinect or handheld devices like the Wii remote, which the company hopes will mean more fun.

Wearable cameras are nothing new; mountain bikers, parachutists and other adventuresome souls have been using them for years. But the Ego LS, from Liquid Image, is a wearable camera that streams your footage at 30 frames per second directly to the Internet via a 4G or WiFi signal. (There are more serious uses for an instant-streaming capability. Firefighters, law enforcement and military types can now use any decent cell signal to send live video anywhere in the world.)

Desperate to improve your baseball, golf or tennis swing? Attach a small, square Zepp sensor to your glove or equipment and you'll have immediate feedback on speed, acceleration, line of sight and power. The small sensors recharge via a USB port and they work directly with both iOS and Android smartphone apps via Bluetooth. For example, if you're practicing your golf swing, the Zepp app will provide instant statistical data on club plane, hand plane, backswing distance, tempo and hip rotation. You can also watch an animated playback of your swing so you can see areas that need improvement.

Most wearables aren't quite ready for prime time, though. Next, read all about some of the inherent obstacles to technologies like these.


Fashion Meets Form

A model walking the cat walk during South Korea’s Ubiquitous Fashionable Computer fashion show in 2006. Obviously, clothing-based tech has to be more wearable than this to catch on with the masses.
© Chung Sung-Jun/Getty Images

One of the primary challenges of wearable technology lies in making it less visible and less, well, dorky. For starters, let's talk looks.

Whether you're a fashionista, hipster or Wall Street huckster, fashion matters. Your choice of clothing provides social cues to others about who you are as a person. And in a world where no one -- no one -- is cool enough to pull off a Bluetooth cellphone headset, manufacturers know that their products must have a certain amount of sex appeal, otherwise they'll draw ceaseless chortles and rolled eyes.


The Move tank top is a prime example of wearable tech being both functional and fashionable. This stretchy garment looks like a hip yoga outfit, but it's interlaced with sensors and actuators to help you improve your workout form. Bend too far for a specific yoga move, and the Move gently buzzes the offending area of your body. The end result is better form and reduced chance of injury, all combined into an outfit that draws eyes in a good way.

In stark contrast, Google Glass and its brethren offer a nerdy cyborg look that a lot of people find annoying. Until they are sleeker and less obtrusive, these kinds of devices may struggle to find mass appeal.

Function is another matter entirely. Intertwining electronics with fabrics brings to mind that horrible shirt tag itch, times 10. The skin recoils at the thought of sensors scratching away, all day long. But engineers are surmounting comfort and user-friendliness issues.

Researchers at the Polytechnic School in Montreal have built touch-sensitive controls right into clothing. They coated copper wires with polymer in a size small enough (less than a millimeter in diameter) to be woven into textiles that, notably, are made with legacy manufacturing processes.

The end result could be a shirt that changes the volume of your headphones. Or a car seat that you swipe to change the seat position, or perhaps turn the heater up or down. These fabrics wash just like any other type of material, an important trait when battling the dirt and stains of everyday life.

Of course, electronics without a power source are rather pointless. The same researchers have also found a way to make a soft, flexible lithium-ion battery that looks a lot like artificial leather. This material, too, can be woven into clothes to power a range of gadgets, providing hundreds of volts throughout the day. A washable version is in the works as of early 2014.


Another Piezo of the Puzzle

For years now, engineers have been working to integrate piezoelectric components into clothing. Piezoelectricity is electricity generated by mechanical stress -- in other words, bending. The minute piezoelectric parts that make this kind of energy are also sometimes called nanogenerators.

When tiny piezoelectric components bend, they generate a detectable electrical charge. Imbed these components into clothing, run several dozen miles, and you could help solve the energy crisis, right?


That idea isn't quite as far-fetched as it seems. Dance clubs have installed floors with piezoelectric parts, which bend when people dance on them. That energy is then used to power other areas of the club, such as lights or the sound system. Furthermore, a company could place the same kinds of components into, say, a soldier's boots. Each step would literally provide power to an array of battlefield devices.

One catch is that piezoelectric materials don't generally product a strong electrical discharge. Often that energy is measured in only millivolts or nanoamps. But with better ways to harvest and store the energy on a person, it could be captured, saved and funneled towards power-hungry gear in the near future.

For a soldier or adventurer stranded for days without access to electrical outlets, this kind of technology holds great potential. Suddenly, there would be a way to revive depleted batteries in a satellite phone or GPS unit. A situation that was once potentially deadly could be managed much more easily just by simply walking around for a while.

Energy-capturing clothing is still in prototype stage. Barring sudden breakthroughs in research and manufacturing, it may be years before consumer-grade shirts and shoes can turn our elbow grease into measureable electrical pulses.


Your Digital Self

Will your near future be filled with augmented reality glasses and mood sweaters?
© Josh Edelson/AFP/Getty Images

With all of the obvious potential for wearable tech, you might wonder why these devices haven't already found a place in the mainstream. There are the usual pitfalls to predicting a product's popularity, and much of the discussion circles back to expense.

Digital versions of products we already have are obviously going to cost more to make. And manufacturers aren't keen on retooling their production equipment unless they're sure they can turn a profit on the end product. Consumers, for their part, might light up at the idea of owning a pair of pants that can charge their smartphone, but the concept might not be as exciting once they see the price tag.


There's also the balance between wanting and actually needing more technology. Sure, Google Glass may instantly offer up walking directions and restaurant reviews. But is it really a necessary evolution in consumer technology? Or is it just a way to stroke your digital ego and impress your Glass-less friends?

Then there are privacy and security issues. At this point, most everyone who owns a cell phone understands that privacy is perhaps a forgotten concept. Yet a health-monitoring device, hacked by a soulless offender, could expose very private information to the wider world.

And of course, there's the elephant in the room. Why stop at wearable devices? Why not just embed chips and sensors directly inside your skull? Implant a WiFi chip in your frontal lobe and your Internet connection becomes a lot more convenient -- and if you lose the password, the reset button is behind your right ear.

Kidding aside, wearable technology is an enticing adventure for anyone who uses digital gadgets. Perhaps one day soon you'll never have to worry about losing your phone again -- it will simply be built into your turtleneck.


Lots More Information

Author's Note: How Wearable Technology Works

I remember the struggles I had when I first took up golf years ago. My swing was a wreck and I was clueless as to fixing the problem. There were no digital cameras to record my swing, so I was left trying to understand why my ball continually wound up flying hundreds of feet in the wrong direction. A wearable sensor and related smartphone app (and video feedback from the same phone) would have literally been a game changer. Instead of grasping at straws wondering which body part was out of alignment, I would have known immediately that my hip rotation was too short. That's just one small promise of wearable tech. Consider me on the bandwagon.

Related Articles

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