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Low heart rate variability (bad) is associated with low Vitamin D and COVID – many studies | VitaminDWiki
Generating RMSSD and SDNN from IBI, BPM data · Issue #147 · WorldFamousElectronics/PulseSensorPlayground · GitHub
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Frontiers | A Practical Guide to Resonance Frequency Assessment for Heart Rate Variability Biofeedback
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