Below we present time series of 100 inter-beat intervals (a.k.a "RR") recorded in real time for three distinct clinical cases. Note the heart icon beats according to the RR intervals. It helps if you can imagine your own heart beating in synchrony with the heart icon: You may feel health/disorder.
Task: determine which one corresponds to the normal/healthy heart activity.
Advanced: what type of pathology of the heart is represented by the abnormal/unhealthy cases?
Extra points: in the Appendix the shown is the heart beating during some recreational activity. Hint: winter, Finland...
What recreational activity is represented by the following? (See also the Hints below)
The heart beat during staying in the cold air and/or ice-cold water (after sauna, see below).
The heart beat in the Finnish sauna (T around 100 °C or more!).