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Heart rate variability power spectrum during paced breathing for Participant 1 (A) and Participant 2 (B) at baseline and 10 weeks post HRV-F. VLF band: very-low frequency band (0–0.04 Hz); LF band: low-frequency band (0.04–0.15 Hz); HF band: high-frequency band (>0.15 Hz); RR variability: variation in time period between beat-to-beat intervals of the heart.
