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We made our own DFA (detrended fluctuation analysis)
program. We applied it for checking characteristics for
the heartbeat of various individuals. Healthy subjects
showed a normal scaling exponent, which is near 1.0
(ranging 0.9 to 1.19 in our own temporary guideline).
This is in agreement with the original report by Peng et
al. long time ago. In the present study, we investigated
the person who has an extra-systole heartbeat, and
revealed that their arrhythmic heartbeat exhibited a low
scaling exponent (around 0.7). Alternans, which is the
heart beating in period-2 rhythms, exhibited a much low
scaling exponent (around 0.6). We may conclude that if
it would be possible to make a device that equips a DFA
program, it might be useful to check the heart condition,
and contribute not only in nonlinear physics but also in
biomedical fields; especially as a device for health
check, which is applicable for people who are spending
an ordinary life, before they get seriously heart sick.
