Fitness trackers are very popular today for a good reason. They will not only assist you in performing workouts such as running, swimming or cycling, but will also help you and your healthcare professionals understand your medical situations, such as: B. the detection of irregular heart rhythms. In addition, they can be helpful in everyday activities such as weather reports and calendar notifications.
Buying a new fitness tracker can be a daunting task. There is a wide selection of brands and prices. Fortunately, you can use a handful of important points to narrow down your choices.
All About the Sensors
The basic job of these devices is to track their physical activity. They accomplish this by recording and interpreting data generated by a variety of sensors. Twenty years ago, these sensors weighed several pounds and cost thousands of dollars. Parts today are the size of a grain of sand and cost a few cents.
The base sensor is an accelerometer that detects the linear acceleration. As a rule, three of them are configured as one unit and cover all three axes. To capture a radial (rotating) motion, a tracker requires gyroscopes: again, one for each axis. Some trackers also have magnetometers that sense magnetic fields, giving you an idea of which way is clear. Not all trackers have all three types of motion sensors, but more sensors mean better results and more accurate data.
The other common sensor type in a tracker is photoplethysmography. This technology combines one or more LED lights with light sensors mounted on the back of the device. The light is reflected by blood and tissue, and the amount of reflected light changes as the heartbeat pumps blood through the vessels.