Everything you need to know about photoplethysmography (PPG), the technology behind heart rate measurements in fitness watches and smart rings.

Your average daily heart rate is a useful metric; so is your daily step count. Combining the two might be even better.

A heart rate device inspired by Starfish can potentially solve the accuracy problems, detect serious cardiac issues, and solve a crucial power problem, too.

Or, you can use it as a rudimentary way to measure your heart rate and blood oxygen levels. It’s by no means a medical grade tool, but this build from [Taste The Code] is still quite impressive.

A lower DHRPS is better (something more like 0.008), Zhanlin Chen explains. This could signify someone who takes 10,000 steps ...

The first prospective study to look at this problem since investigators identified an issue earlier confirmed that clinicians ...

Pulse measurement equipment is now easier to use than ever before, with many devices offering easy-to-align solutions and plug-and-play computer operation, reports Neil Savage. Ultrafast lasers ...

The differences, or bias, between estimates of blood oxygen saturation levels as measured with pulse oximeters compared to the gold-standard method of measuring oxygen saturation in arterial blood ...

Circular is a relatively small player in the smart ring segment, which is currently led by the likes of Oura, Samsung, and RingConn. Yet, following a not-so-good start,. The Circular Ring 2, which ...

But how do fitness trackers measure your heart rate, exactly? And how accurate are these measurements? We asked the experts. Most fitness watches and smart rings depend on a technique called ...