“…It is very important to control mental workload or stress while performing work or daily activities under a variety of circumstances [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ]. They often refer healthcare professionals to ask for effective ways to manage the level of mental stress themselves or wish to use health monitoring systems before serious diseases occur [ 11 , 12 , 13 ]. Among those recommended, a controlled respiration method, generally known as deep breathing, has often been suggested to modulate physiological mechanisms underlying mental stress and homeostasis.…”