Here is a smartwatch that tracks your blood pressure and heart variability. It detects fever & hypothermia and offers sleep analysis. The device lets you compare your performances with others. It helps you avoid training harder than your body can handle.
You can record heart activity and share it with your physician. You can define triggers for heart rate, blood pressure, temperature, and oxygen saturation level in your blood, and the device alerts you and your family when appropriate. More info is available on Kickstarter.