| R & R
 The Autonomic Nervous System's (ANS) sympathetic and parasympathetic divisions typically function in opposition to each other. But this opposition is better understood as complementary in nature rather than antagonistic. For an analogy, one may think of the sympathetic division as the accelerator and the parasympathetic division as the brake. The sympathetic division typically functions in actions requiring quick responses, such as in the fight-or-flight response. The parasympathetic division functions with actions that do not require immediate reaction. The main actions of the parasympathetic nervous system are summarized by the phrase "rest and repose," opposite the "fight-or-flight" actions of the sympathetic nervous system.
The latter corresponds with arousal and energy generation, diverting blood away from the gastrointestinal tract and the skin by the constriction of blood vessels in those organs and regions. It increases heart rate and myocardial contractility, providing a mechanism for the enhanced blood flow to skeletal muscles and the lungs. It dilates the pupil and relaxes the lens, allowing more light to enter the eye.
Both functions of the Autonomic Nervous System's (ANS) served the primitive man well for R & R and digestion after an arduous hunt. They still serve us well in modern life. However, when a state of arousal becomes prolonged or repetitive, it triggers the adverse reactions of stress. How can we disengage at will from such state of arousal, with the attendant risk to our health and wellness? Is there a way by which we can elicit the benefits of R & R?
|
