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5.
Heart Rate Algorithm
5.1
HR calculation per beat
When calculating HR of each beat, 9 beats including previous 4 beats and following 4 beats are
required.
Number of effective sections / (( time of B9 – time of B1 ) / 60 )
Definition of “section” is the interval between consecutive beats such as B1 and B2, and in case 1 of the 2 beats
is A ( Artifact ) , exclude it from effective section. If there are less than 5 effective sections, no calculation.
As the above picture, if beats S A N N V N N N N are within a section of 5 seconds and the excluded section is
1 second, the V beat in the center will have HR value of 6 / ((5-1) / 60) = 91 bpm.
5.2
Average HR calculation of a section
Average HR of a section is calculated with the beats included in the section.
If the above data is within a 20 second frame, the average HR is calculated as follows:
Number of effective sections / (( Total length of effective sections ) / 60 )
At this time, “section” refers to the interval between consecutive beats such as B1 and B2, and in case 1 of the 2
consecutive beats is A ( Artifact ) , exclude it from effective section before calculation.
Therefore, there are 12 effective sections, and if the total length of invalid sections is 2 seconds , the average is
calculated as follows:
12 / ((20-2) / 60) = 40 bpm
