DEVICE AND METHOD FOR DETECTING AND SIGNALLING A STRESS STATE OF A PERSON

• Main Authors: BACHMANN, Philipp, FRITZSCHE, Rolf
• Format: Patent
• Language: English; French; German
• Published: 06.11.2019
• Subjects: DIAGNOSIS; HUMAN NECESSITIES; HYGIENE; IDENTIFICATION; MEDICAL OR VETERINARY SCIENCE; SURGERY

The method involves continuously sensing and processing the data of current pulse and instantaneous heart rate variability (HRV) and comparing the obtained current state function of the person with an alarm criterion. The normalization of mean values selected from larger value of moderately expected extreme values of pulse rate or the maximum HRV value determined in the previous time interval or during the preceding predetermined number of pulsations is carried out using the extreme or minimum values of pulse rate and the maximum or minimum HRV values. The method involves continuously sensing the data of current pulse and instantaneous heart rate variability, continuously processing the data of current pulse and instantaneous heart rate variability, and comparing the obtained current state function of the person with an alarm criterion. A value for stress index is obtained by adding the stress partial index (SIP) value generated from normalized average value of pulse at the first time interval or the predetermined number of beats and a normalized average value of HRV in the first time interval or predetermined number of beats. The normalization of mean table values is performed by the age-related minimum and maximum heart rate and HRV values, and the maximum and minimum values of the measured pulse rate and the HRV values are determined in the first time interval or during predetermined number of beats. The stress index is determined again by adding SIP value for the stress index of normalized average value of pulse in the interval of time or of predetermined number of beats and the value obtained from normalized average of heart rate variability in the time interval or the predetermined number of beats preferably having the same time length or the same number of beats, in the further interval of time or during further predetermined number of pulsations. The normalization of mean values selected from larger value of moderately expected extreme values of pulse rate or maximum HRV values determined in the previous time interval or during preceding predetermined number of pulsations is carried out using the expected extreme or minimum values of pulse rate and the maximum or minimum HRV values selected from the previous time interval or during the preceding predetermined number of pulsations. An independent claim is included for an apparatus for detecting and reporting current stress state of person.