Science

SATHeart health data is based on quantitative measures from your heart blood pulse wave. Your heart act as a pump to circulate the blood cells and oxygen across the body tissues and organs. The pump rhythm is controlled by some parts of our central nervous system (brain) as well as some parts of our vessels local nervous system.

The blood pulse wave is propagating from the heart to the lungs, brain, organs and peripheral vessels. Along her trip, the wave ‘collect’ information about the state of these organs and tissues. This is where SATHeart take its information.

The blood pulse wave does not only contain information about your physiology, but also about your mental state: emotions, feelings, thoughts. So, SATHeart is a complete Body and Mind sensing platform and this is why it is best suited for physical & mental monitoring.

The blood pulse wave has been analysed since centuries using finger pressure on different parts of the body, but most naturally on the wrist artery because of its ease of access and its remote location from the source: the heart. Modern technologies enable to capture these waves with rather simple devices. SATHeart measures your pulse wave using light. The principle is that when light is projected into our skin and deeper tissues, it senses these different layers and physiological phenomena depending on the energy of the light from the emitter. As the heart muscle is pumping in and out the blood from and to our arterial system and propagate it in a form of a pressure wave, the light rays landing on the receiver take the shape of this wave.

Illustration of light propagating in the skin tissue: Philippe Renevey (c)

The blood pulse wave has thus many features of rhythm and shape. These two are captured by the SATHeart device and analysed using our algorithms. All of these features have high accuracy in comparison to medical instruments. This is due to the fact that SATHeart is used when you are not moving or at sleep, which has a net result of keeping the rhythm and shape information as accurate as possible.

Illustration of a blood pulse wave as seen from the light receiver. We can see the different heart beat shapes as well as the different interesting points (marked as dots) potentially used for SATHeart analysis.

SATHeart Team