Abstract: The disclosed system relates to the diagnosis and correction of autonomic nervous system imbalance through the recognition and improvement of parasympathetic tone of a user using paced breathing and vibratory neuromodulation. The system includes a wearable IBI detector, software for analyzing PSD data and determining recommended therapy, a vibratory stimulator, and optional smart phone guidance. The IBI detector reads the pulsatile waveform to produce IBI data that is used to compute PSD data. The PSD data is analyzed for ANS imbalance indicators and therapy is recommended based on continuously updated information stored in a database. Results from application of recommended therapy are stored and shared and can be used to build a personalized training regime to strengthen parasympathetic tone.