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The parasympathetic nervous system (PSNS) is one of the three divisions of the autonomic nervous system, the others being the sympathetic nervous system and the enteric nervous system. [ 1 ] [ 2 ] The autonomic nervous system is responsible for regulating the body's unconscious actions.
Although reciprocal activation between sympathetic (cold shock) and parasympathetic (diving response) systems is commonly adaptive (follow one another), simultaneous activation appears to be associated with arrythmya. Cold water induced rhythm disturbances are common, albeit frequently asymptomatic.
Diving reflex in a human baby. The diving reflex, also known as the diving response and mammalian diving reflex, is a set of physiological responses to immersion that overrides the basic homeostatic reflexes, and is found in all air-breathing vertebrates studied to date.
Polyvagal theory views the parasympathetic nervous system as being split into two distinct branches: a "ventral vagal system" which supports social engagement, and a "dorsal vagal system" which supports immobilisation behaviours, both "rest and digest" and defensive immobilisation or "shutdown". [14]
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The autonomic nervous system is a component of the peripheral nervous system and comprises two branches: the sympathetic nervous system (SNS) and the parasympathetic nervous system (PSNS). The SNS controls the more active responses, such as increasing heart rate and blood pressure.
The parasympathetic nervous system kicks in to quickly drop heart rate, relax the body and conserve oxygen. Learning how to turn on your parasympathetic nervous system is key to handling stress ...
Cold showers are gaining even more popularity among health-conscious and wellness-focused individuals—for good reason. People on TikTok are raving about their benefits and life-changing results ...