The Science behind CALM. – CALMness Score

We already covered the fact that CALM. gets accurate heart beat data via the ECG signal, and the data can be used to correlation between your heart beat timings and your autonomous nervous system (ANS) which controls your unconscious body functions in the sleep analysis post. While the autonomous nervous system balance is used as one of the many features to classify sleep stage in sleep analysis, it is the most important factor considered in the derivation of CALMness score. There are two main types of the ANS, the sympathetic and parasympathetic. The sympathetic nervous system (SNS) controls your fight or flight response. The activity of this part of the nervous system […]

The Science behind CALM. – Sleep Analysis

CALM. detects sleep-stage using movement, and the ECG signal from your heart. ECG is the electrical signals that are making your heart move, measured directly from the heart, as opposed to heart rates monitored at the wrist or finger, which are measuring the rush of blood through your veins as a result of your heart pumping. This means that we can get millisecond accuracy on the activity of your heart, and also interesting (and useful!) noise from your lungs. From the ECG, we can derive heart rate very accurately, as well as your breathing rhythm with reasonable accuracy using a well known technique called ECG Derived Respiration (or EDR) [3]. The […]