Gentle slow breathing is generally considered safe for healthy people. Intense hyperventilation-based breathwork is a different category, with documented contraindications including cerebrovascular and cardiovascular conditions, epilepsy and panic disorder.
Yes, it can be measured. In a small study of 12 stroke survivors, breathing at six breaths a minute instead of twelve raised baroreflex sensitivity by 10%.
Mindfulness-based stress reduction is a standardised eight-week course: weekly group sessions of roughly 2 to 2.5 hours, a five-hour silent retreat in week six, and daily practice in between. It is the program most meditation research actually studies.
Moderate evidence for improving anxiety, with a small effect size of 0.38 at eight weeks falling to 0.22 by three to six months. The same meta-analysis found no evidence that meditation beats any active treatment, including exercise or therapy.
Your body releases hormones that produce the fight-or-flight response: heart rate, breathing rate and blood pressure go up, muscles tense and you sweat more. It is a protective system designed to switch on briefly and then switch off.
Saunas have the stronger evidence: in a 20-year Finnish study, men who used a sauna more often had lower rates of heart-related and all-cause death, though that shows a link rather than proof. Research on cold water is mixed and mostly small, and regular ice baths after strength training may reduce muscle gains.
Pick a pattern, press start and breathe with the circle: in as it grows, out as it shrinks. Breathing research points to five minutes or more a session.
Alcohol abuse and alcohol dependence were separate DSM-IV diagnoses: abuse meant drinking that caused harm, dependence added tolerance and withdrawal. DSM-5 merged them into one alcohol use disorder.