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Whether it is for personal use or for medical application, wearable sensors are becoming more and more widespread. This is the industry answer to two parallel trends. First, the public show a wish to collect data about their own lifestyle. This rather new effect appeared with the rise of smartphones, smartwatches and other heart-rate belts for athletes, with the promise of understanding and improving their health and performance. From a medical point-of-view, these commercial devices are not usable because their results come from an unproven algorithm, far from clinical trials. However, the health-care professionals see a strong benefit of having trustworthy wearable devices, which can be used by their patients for extended periods of time. Having in situ medical-grade data collection is able to give insights about the patient's health status and its development. There are however limitations to what can be performed. Ideally, such a device should record as many data as possible, without requiring any set-up nor maintenance. Because of technical limitations, there are choices to be made. For example, which signals are captured, or what should be the minimal battery life? Any additional burden put on the patient hinders using the device, especially in the case of a non immediate life-threatening situation such as a daily screening. State-of-the-art biomedical wearable devices deploy multiple strategies to match the specification's stringent requirements. First it is engetically expensive to sense signals. The more data is collected, the smaller the battery lifetime. Therefore, extensive research is pursued beforehand to minimize the number of signals …