Measuring HRV during sleep is crucial because it acts as a "blank canvas," removing the confounding variables of daily psychological and physiological stress. This provides the most accurate window into the nervous system's underlying ability to repair and regulate itself. You cannot fake regulation during sleep.

Research found that diverse prayers, like Buddhist mantras and the Catholic Rosary, all guide practitioners into a breathing rate of ~5.5 breaths per minute. This "coherent breathing" state maximizes heart rate variability and blood pressure regulation, suggesting an ancient, embedded wisdom for physiological balance.

The company's core value proposition is not just collecting new biochemical data, but fusing it with existing data streams from consumer wearables (like Apple Watch, Oura) and EMRs. This combination creates an exponentially more valuable, holistic view of a person's health that is currently impossible to achieve.

The goal isn't to constantly chase a higher HRV score. A healthy, adaptive nervous system is reflected in a stable HRV that doesn't fluctuate wildly day-to-day. High variability between days can signal overtraining or poor recovery, even if the absolute numbers seem high.

While wearables generate vast amounts of health data, the medical system lacks the evidence to interpret these signals accurately for healthy individuals. This creates a risk of false positives ('incidentalomas'), causing unnecessary anxiety and hindering adoption of proactive health tech.

Unlike simple relaxation exercises, HRV biofeedback and resonance breathing should be viewed as training for the nervous system, similar to lifting weights for muscles. While a sense of calm is a frequent byproduct, the primary objective is building long-term systemic resilience and adaptability.

Elite performers use a metric called HRV-CV (coefficient of variation) to track recovery. It measures day-to-day HRV fluctuation. A low HRV-CV, indicating stability and consistent rebounding, is more valuable for assessing adaptation than a high daily HRV score.

Relying too heavily on metrics from devices like sleep trackers can be counterproductive. Waking up feeling great, only to see a "bad sleep score," can negatively influence your physical and mental state for the day, demonstrating a powerful nocebo effect where data trumps reality.

A single HRV reading is not a direct measure of psychological stress. Instead, tracking HRV over time reveals how well your nervous system is *adapting* to cumulative stress. One low reading is meaningless without the context of your personal baseline and trends.