Heart Rate Variability

Heart Rate Variability (HRV) is the variation in the time interval between successive heartbeats.¹ Contrary to intuition, a healthy heart does not beat like a metronome — it constantly adjusts its rhythm in response to breathing, stress, and environmental demands.

What It Measures

• •Parasympathetic tone — higher HRV generally indicates stronger vagal influence
• •Stress resilience — ability to recover quickly after challenge
• •Nervous system flexibility — capacity to shift between activation and recovery
• •Recovery capacity — readiness for physical and mental load

In ONDA Life

Increased HRV is a biological marker of Part 1 ("I Am") and Part 2 ("I Move") progress.² Part 1 practices activate the parasympathetic system, raising baseline HRV. Part 2 "Rhythmic Coherence" further increases HRV by synchronizing axial movements with the respiratory cycle.

References

1. •Thayer & Lane, Neurosci Biobehav Rev (2009) — HRV as vagal tone marker
2. •Lehrer et al., Appl Psychophysiol Biofeedback (2000) — resonance breathing and HRV