Dette er et svar på en studie hvor de viser at HRV er høyest ved 0.1 Hz (6 pust/min).

http://journal.publications.chestnet.org/article.aspx?articleid=1082860

we determined that the phase relationship between heart rate and respiration was 0° only at a respiratory frequency of approximately 0.1 Hz, in which the target frequency heart rate variability also was highest (Fig 1 ).