Modifications

=== Heart Rate Variability Testing ===

=== Heart Rate Variability Testing ===

(HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat interval.

(HRV) is the physiological phenomenon of variation in the time interval between heartbeats. It is measured by the variation in the beat-to-beat interval. <ref>https://www.psiram.com/de/index.php/Herzfrequenzvariabilit%C3%A4t (allemand)</ref>

== Références ==

== Références ==