Researchers at MIT are working on a project to measure the heart rate and breathing using a smartphone’s accelerometer in the user’s pocket or bag without the need for wearable sensors. When the user is at rest the slight movements due to breathing and heart beat are measured using the smartphone and used to derive the heart and breathing rates.
According to a paper published recently, in a test with a dozen participants (a very small sample for this type of test) the heart rates measured using the new method were within one beat when compared to FDA approved sensors they were using simultaneously. The measurements of breathing rate were about a quarter of a breath of the approved sensors.
The aim is to sense when someone is stressed by using the heart rate and breathing and then help cope with the situtation by suggesting, say, breathing exercises or calling for help.