Modulation of Cardiac Autonomic Dynamics by Structured Auditory Rhythm: Evidence from ECG and HRV Spectral Analysis

Auditory rhythmic stimulation, particularly mantra-based vocalizations, has been increasingly associated with modulation of autonomic nervous system activity and cardiovascular regulation. This study presents a computational and signal-based analysis of neurocardiac responses to 30-minute rhythmic Ram mantra exposure, evaluated using simulated electrocardiographic (ECG) and heart rate variability (HRV) metrics. Frequency-domain HRV analysis demonstrated a significant increase in high-frequency (HF, 0.15–0.40 Hz) spectral power, indicative of enhanced parasympathetic (vagal) activity. Simulated ECG signals revealed increased RR interval duration, reduced heart rate, and improved cardiac rhythm coherence, without pathological waveform alterations. These findings are consistent with vagally mediated autonomic regulation and increased neurocardiac synchronization. Mechanistically, rhythmic auditory stimulation is known to entrain respiratory and neural oscillatory networks via auditory–vagal pathways involving the nucleus tractus solitarius and central autonomic network. Increased HRV and cardiac coherence are established biomarkers of improved cardiovascular adaptability, emotional regulation, and reduced physiological stress load. The present findings align with prior empirical evidence demonstrating that meditation, chanting, and controlled breathing enhance vagal tone and autonomic balance. These results support the hypothesis that structured auditory rhythmic exposure may serve as a non-invasive neuromodulatory intervention capable of improving cardiac autonomic regulation and neurophysiological stability.