Abstract: Scrupulous mathematical analysis of officially recognized results of approved medical research had allowed to establish dependence of personal heart beats on individual metabolic rate related to the person's weight, height, age, gender, medical treatment, blood pressure, as well as heart rate at rest, and led to deriving a process for a device continuously converting personal pulse into trustworthy estimates of instantaneous physical or mental stress, blood pressure, and metabolic, instead of uncertain mechanical, energy.

Abstract: Vigorous exercise might produce great health benefits but is not recommended for everyone and has to be performed under professional trainer/doctor supervision. That requires preliminary lab tests which are usually avoided due to the lack of time or finances. Personalized wrist electronic device allows avoiding the above complications particularly for non-athletes. The principle of design for such device was achieved through rigorous mathematical analysis of approved medical research facts linking personal heart rate to individual's blood pressure and metabolic rate depending on person's weight, height, age, gender, medical treatment, and blood pressure together with heart rate at rest.