the main breathing protocol (resonance breathing) was introduced on the heart rate variability page

this type of breathing is similar to the ujjayi (victorious) breath in yoga, in which a slight contraction of the throat (glottis) is used to make the breath audible and sibilant. this type of breathing (pranayama) has been shown to improve emotional regulation and relaxation and reduce stress.¹⁻³

more details on how to do this technique are given on the instructional videos page

try out the breathing protocol and see how it affects your hp and how you feel!

References

1 Epe J, Stark R, Ott U. Different Effects of Four Yogic Breathing Techniques on Mindfulness, Stress, and Well-being. OBM Integrative and Complementary Medicine 2021; 6(3): 031; doi:10.21926/obm.icm.2103031.

2 Lotfalian S, Spears CA, Juliano LM. The effects of mindfulness-based yogic breathing on craving, affect, and smoking behavior. Psychol Addict Behav. 2020 Mar;34(2):351-359. doi: 10.1037/adb0000536. Epub 2019 Nov 21. PMID: 31750699; PMCID: PMC7064378.

3 Niranjan P, Balaram P. Immediate Effect of Ujjayi Pranayama on Attention and Anxiety among University Students: A Randomised Self-control Study. JOURNAL OF CLINICAL AND DIAGNOSTIC RESEARCH. 2022 Feb 1;16(2):VC01-4.