When you train, BloodVitals SPO2 the working muscles in your physique create heat, BloodVitals wearable which is transported across the body by your blood. As your physique temperature will increase, the blood vessels close to the skin open up and the sweat glands work tougher. The physique is cooled by the evaporation of sweat from the pores and skin and BloodVitals SPO2 the switch of heat from the blood to the air. When the air is humid (already saturated with water), it limits the amount of sweat that may evaporate