[train.red]Muscle oxygen and hemoglobin, Smo2&tHb, train.red Smart SmO2 Sensors train.red Tracks your muscle oxygen(SmO2%) in real time with sensor. Our smart app translates this muscle data into key featires to guide athletes to improve their performance. train.red - Muscle Oxygen Sesors tain.red - Muscle Oxygen monitoring To contract muscles during exercise need energy. This energy comes from ..