measurements are correlated to both the sweep i e measurements made each 20 seconds and modes i e u201c walking u201d in which they occur and may be stored as individual sequential records in non volatile memory 312 if sufficient storage is available within non volatile memory 312 a relational data structure may be established to provide easier correlation of data relative to the individual user each mode has associated with it an optimal pulse rate opr for the user indicating the state of the body achieved during the activity this opr is based on factors maintained in the pwm 100 such as age sex height body mass index bmi body impedance analysis bia fat content athletic condition and such other wellness and physiological measurement requirements as deemed necessary entry of these data may be accomplished manually by operation of mode switch 350 corresponding to mode switch 130 of fig1 and control switches 352 354 illustrated in fig3 or downloaded to the pwm 100 by a data station as will be explained more fully later with respect to fig4 in order to calibrate pwd 100 the user 39 s resting pulse rate rpr is obtained for a short period following rest and stored in non volatile memory 312 it is assumed that the resting pulse rate is a valid indication of the user 39 s physiological.