The Science

Patent-pending wearable technology that manages stress by leveraging AI and 25 years of evidence-based research in HRV Biofeedback Therapy.





Slow breathing phenomenon: During inhalation, heart rate increases and blood pressure decreases. The opposite occurs during exhalation.


Syncing cardiovascular and respiratory systems using the 2nd, 3rd and 4th patent applications improves several clinical biomarkers of your stress:

Proprietary measurements in V1:
• Heart Rate Variability
• Heart Rhythm Smoothness
• Respiration
• Rate of Change

Proprietary measurements and estimation in V2:
• Skin Conductance
• Skin Temperature
• Blood Pressure

Additional measurement improved:
• Gas exchange


The result of the improved biometrics is optimized cardiac efficiency, and a stimulated baroreflex and vagus nerve.


The baroreflex or baroreceptor reflex is one of the body’s homeostatic mechanisms that helps to maintain blood pressure at nearly constant levels.


The vagus nerve is the primary nerve for the parasympathetic nervous system (relaxation response).

Branches of the Autonomic Nervous System:

Before Zone

With Zone


Upon exhalation, baroreceptors communicate to the brain stem via the vagus nerve to activate the parasympathetic nervous system (relaxation response) and inhibit the sympathetic system (fight or flight response). This is called the vagal brake and it’s strongest when cardiovascular and respiratory systems are in harmony.


Regularly stimulating the vagal brake restores balance to the Autonomic Nervous System, maximizes blood pressure stability and improves stress, anxiety, depression, hypertension, PTSD, athletic performance, insomnia, diabetes, and asthma.


The effect of heart rate variability biofeedback training on stress and anxiety: a meta-analysis

Heart Rate Variability Biofeedback for Major Depression

Effect of Heart Rate Variability Biofeedback on Sport Performance, a Systematic Review

Biofeedback for psychiatric disorders: a systematic review

The benefit of heart rate variability biofeedback and relaxation training in reducing trait anxiety

The Impact of Resonance Frequency Breathing on Measures of Heart Rate Variability, Blood Pressure, and Mood

The Promise of Heart Rate Variability Biofeedback: Evidence-Based Applications 

Heart rate variability biofeedback: how and why does it work?

What the experts are saying

With peaceful diaphragmatic breathing, I can rebalance my biological system and reduce the negative effects of stress as well as allow myself to regenerate

Dr. Erik Peper
Internationally known Biofeedback Expert
Distinguished Professor of Psychology

We found that these slow breathing techniques, when done at exactly the right frequency, produce great benefits such as reducing stress, anxiety and depression

Dr. Richard Gevirtz
Credited for Discovering HRV Biofeedback Therapy
Professor of Psychology

The whole point is to improve cardio-respiratory function by optimizing the relevant biomarkers. This very thorough approach puts Vardas ahead of the competition. 

Dr. Chris Gilbert
Clinical Psychologist and Biofeedback Expert