Wearable devices are increasingly used in healthcare and sports. Most wearables (74%) in a literature search record cardiorespiratory variables. A prototype to allow coaches to guide sportsmen during training, a mobile application to share physiological data in the cloud during exercise, a hospital risk detector based on tags, wrist and card IDs (CAMACUA) as well as a cardiac failure follow-up application with artificial intelligence (SIMIC) are described. Modern Medicine and Sports now benefit from wearable technologies to lower risks of in-training injury, drug dispensing errors and accidents secondary to proximity of objects not meant to be close to each other.