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How does aging affect the parasympathetic system?

With age, a significant shift occurs in the autonomic nervous system, characterized by an overall decrease in parasympathetic activity and a relative increase in sympathetic tone. This shift, often reflected in decreased heart rate variability (HRV), illustrates a decline in the body's 'rest and digest' capabilities. Understanding how does aging affect the parasympathetic system is key to addressing many age-related health challenges.