We would like to develop an embedded system to control teh health and perfomance of a sports-man on real- time using Raspberry PI 3 B. We need some sensors, what would be the most benetic sensosrs to include?
If you have a specific application in mind, I recommend finding existing devices with the same application and using the same sensors that they use. That way, you will be able to directly compare your device with existing literature.
Measurements for athletic health monitoring may include:
Heart rate - very common, easy to implement, and indicates oxygen supply and exercise intensity
Blood pressure - can indicate health problems in athletes
Respiratory gas exchange (e.g. VO2, VCO2) - better indication of oxygen supply and exercise intensity, but may not be suitable depending on your system
Blood lactate - good indicator in endurance exercises
You can also estimate the calories burned using duration and Metabolic Equivalent for Task (MET)
Measurements for exercise performance depend on the target exercise, but are typically things like maximum speed, time to finish a race, maximum weight and reps.