The Science

Activity can predict chronic diseases and unhealthy lifestyle choices in general.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6210465/

Vagus Nerve as Modulator of the Brain–Gut Axis in Psychiatric and Inflammatory Disorders.

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5859128/

The Vagus Nerve in the Neuro-Immune Axis: Implications in the Pathology of the Gastrointestinal Tract –
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5673632/

The vagus nerve and the inflammatory reflex—linking immunity and metabolism –

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4082307/

Vagus nerve stimulation: indications and limitations –https://pubmed.ncbi.nlm.nih.gov/17691314/

A review of vagus nerve stimulation as a therapeutic intervention –

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5961632/

Chronic fatigue syndrome from vagus nerve infection: a psychoneuroimmunological hypothesis – https://pubmed.ncbi.nlm.nih.gov/23790471/

How positive emotions build physical health: perceived positive social connections account for the upward spiral between positive emotions and vagal tone – https://pubmed.ncbi.nlm.nih.gov/23649562/

Vagus Nerve

Heart Rate Variability Synchronizes When Non-experts Vocalize Together – https://pubmed.ncbi.nlm.nih.gov/19853714/

Heart rate variability in obesity and the effect of weight loss – https://pubmed.ncbi.nlm.nih.gov/10215292/

Heart rate variability. Applications in psychiatry

https://pubmed.ncbi.nlm.nih.gov/19853714/

High heart rate variability a major factor in longevity

https://pubmed.ncbi.nlm.nih.gov/20381674/

Music structure determines heart rate variability of singers – https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3705176/

Heart Rate Variability

The effectiveness of progressive muscle relaxation and interactive guided imagery as a pain-reducing intervention in advanced cancer patients: A

multicentre randomised controlled non-pharmacological trial –

https://pubmed.ncbi.nlm.nih.gov/30712739/

Effects of progressive muscle relaxation combined with music on stress, fatigue, and coping styles among intensive care nurses –

https://pubmed.ncbi.nlm.nih.gov/31371164/

Progressive muscle relaxation shows statistically significant improvement in sleep quality and generalized anxiety in COVID-19 patients

https://pubmed.ncbi.nlm.nih.gov/33217826/

Diaphragmic breathing improves heart rate variability and glycemic index in patients with ischemic heart disease and diabetes

https://pubmed.ncbi.nlm.nih.gov/19629309/

Diaphragmic breathing reduces anxiety levels in randomized, controlled trial

https://pubmed.ncbi.nlm.nih.gov/27553981/

Self induced tremoring increased perceptions of quality of life among caregivers in South Africa

https://pubmed.ncbi.nlm.nih.gov/25568824/

Increase in pain threshold and decrease in negative feelings for participants engaged in both relaxation practices and diaphragmic breathing

https://pubmed.ncbi.nlm.nih.gov/21939499/

Progressive Muscle Relaxation & Breathwork