Mar 30, 2026Mental HealthCan Positive Affect Raise HRV? What 36 Studies Really ShowA 2025 review links calm positive affect with higher resting HRV, but excitement can lower it—and causation remains unproven.hrvvagal tonepositive affectparasympatheticRead article →
Mar 30, 2026BreathworkDoes a Longer Exhale Raise HRV Beyond Slow Breathing?A longer exhale may raise HRV even at the same breathing rate. What trials show about resonance breathing, vagal tone, and lasting effects.heart rate variabilityexhale ratiobreathing techniquesparasympatheticRead article →
Mar 22, 2026Autonomic HealthVagus Nerve Stimulation and Opioid Withdrawal PainA tiny tcVNS pilot linked lower opioid withdrawal pain with HRV changes. The biomarker signal is plausible, but it cannot prove treatment or mechanism.hrvvagus nerve stimulationparasympatheticrespiratory variabilityRead article →