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10 papers
This 2022 paper by Stephen Porges presents Polyvagal Theory as a way to study how feelings of safety come from the body's nervous system. It proposes that safety is not just a mood but has measurable brain–body signals. The paper explains neural pathways (like the ventral vagal complex and a…
This narrative review updates an earlier fatigue framework and proposes a clearer way to think about fatigue during tasks. It defines motor or cognitive task-induced state fatigue as a psychophysiological condition that can show up as a drop in performance and/or a stronger feeling of tiredness. The authors add cognitive…
This 2022 systematic review and meta-analysis pooled data from 223 studies to see if voluntary slow breathing (VSB) changes heart rate variability that reflects parasympathetic (vagal) control of the heart. The authors found that VSB increased vagally-mediated heart rate variability during breathing sessions, right after a single session, and after…
In a randomized trial of 20 healthy adults, researchers recorded EKGs during a 3-minute baseline, a 15-minute massage, and a 3-minute postmassage period. Moderate pressure massage raised the high-frequency (HF) heart-rate variability measure and lowered the LF/HF ratio, which the authors say indicates increased parasympathetic (vagal) activity peaking in the…
This meta-analysis looked at randomized trials to see if deliberate breathing practices (breathwork) reduce self-reported stress. Across 12 trials with 785 adults, breathwork was linked with a small-to-medium drop in stress compared with non-breathwork controls (g = -0.35). Similar small-to-medium effects were seen for anxiety and depression. Most included studies…
This clinical trial tested one session of deep and slow breathing (DSB) in 47 adults (22 older, 25 younger). After the single DSB session, high-frequency (HF) heart rate variability increased and self-reported state anxiety went down in both age groups. The rise in HF power was significantly larger in older…
This small cross-sectional study compared 33 regular yoga practitioners with 35 non‑practitioners aged 17–30. The yoga group had a lower resting heart rate (about 69 vs 81 bpm) and a smaller blood‑pressure response on the sustained handgrip test (about 10.2 vs 16.3), differences the authors report as statistically significant. Other…
This review explains why fatigue is hard to study and how artificial intelligence (AI) might help. Fatigue is a personal, subjective feeling that shows up in many ways and comes from many interacting body systems. That makes it hard to measure, compare across people, and link to clear biological causes.…
Ibogaine is a psychoactive herbal medication with alleged antiaddiction properties. We report a case of ibogaine intoxication mimicking Long-QT syndrome resulting in ventricular flutter and nearby cardiac arrest. A 61-year-old man experienced massive QT prolongation and ventricular flutter at a rate of 270 beats per minute requiring defibrillation after ingestion…
This review found that mental health disorders are common and closely linked with worse heart health. People with conditions like depression, anxiety, schizophrenia, bipolar disorder, or PTSD have higher rates of cardiovascular disease and higher death rates from it. The reasons include biology, behaviours, and problems in health care. The…
