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The first HR window starts at the beginning of the first RR interval in the record and ends 6 seconds later. Subsequent HR windows begin at 1-second intervals following the first, i.e, they overlap by 5/6 (83.33%). HR windows that contain part or all of a very long (>3 sec) or very short (<0.2 sec) interval are discarded. All others are used to generate HR measurements that are accumulated in a histogram with 1 bpm bins.
When all intervals
have been processed, summary statistics calculated from the histogram are
written to the standard output and to a WFDB ’.info’ file, in this format:
This example is the output of ’hrstats -r
mitdb/100 -a atr’. From left to right, it shows:
Optionally, the HR histogram can also be written to a file containing two columns separated by a tab. The second column contains the number of measurements of heart rate falling within 0.5 bpm of the heart rate in the first column. The histogram includes only heart rates between the extreme low and extreme high heart rates inclusive.
It may be necessary to set and export the shell variable WFDB (see setwfdb(1) ).
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Updated 8 March 2019