My name is Ali Javey. I'm a Professor of Electrical Engineering in Computer Sciences here at Berkeley. The big flavor of our
research is bridging chemistry with electrical engineering. The goal of this project was to develop a wearable technology that we could use to get some accurate and meaningful information about the physiological
state of an individual. "Push" Sweat provides us with a wealth of information
about our body condition. It consists of a wide
spectrum of different chemicals. How do we get information
that is accurate, useful about the body and health,
and mental conditions, by analyzing sweat? We have developed these array of sensors that can detect and
analyze multiple different chemicals simultaneously in real time, -"and your is glucose
level is also normal" – and at the same time we
have developed the computation that goes along with it. – "Microprocessor." – There is the flexible printed electronic component. This is where we have
the sensors to detect the different chemicals in sweat. And there's a second
component and that's where we can process the information,
we can analyze data, and we can also transmit
the signal to a wireless, for example, wireless cellphone.

Sweat is very complex,
so we decided to target four different chemicals: Sodium, Potassium, Glucose and Lactate. By looking at a concentration
of some of the electrolytes like sodium and potassium,
you can get information about dehydration. By looking at lactate, you
can get information about muscle fatigue. So as your skin temperature changes, the output of the sensor changes. As part of this electronic
board, we do have a processor chip, effectively a computer, that can simultaneous correct for this temperature change. – "The board is working now, " – So once we designed and
fabricated, and built our sensor, the question of course was
what information can be obtained and how accurate it is. So we started trying to
find collaborators on campus or off campus. Just one day in my office, I was Googling "Exercise Physiology at Berkeley," and just like that the
first hit that I get is "Exercise Physiology Lab at
Berkeley led by George Brooks." – It was really exciting to see somebody on campus taking an idea and measuring important metabolites in a body fluid, in real time, in a transportable, miniaturized way.

A sweat sensor to monitor your health

It's just fantastic. What we did was to have people exercise for different times, at
different intensities, under different conditions,
and we were able to show how well the device worked. A medical technician could
get a reading on somebody instantaneously and then follow that, instead of taking a blood sample and then sending that to a laboratory
and waiting several hours for a result.

It's the beginning of I
think of a great new realm in bio-sensing. Not only for personal
use, but for astronauts, people who need to be monitored, for this or that condition, in real time. – "So all the values are
within the normal range?" – "Yes." – I'm very excited about this work. This technology can be
used in the future as a way of getting useful information
about health in real time, and it's all done using
a platform that is just on the back of the watch..