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Gender-selective interaction between aging, blood pressure, and sympathetic nerve activity
Krzysztof Narkiewicz1, Bradley G Phillips, Masahiko Kato
1Department of Hypertension and Diabetology, Medical University of Gdansk, Poland.
Hypertension (Dallas, Tex. : 1979)
|March 16, 2005
Summary
Aging significantly increases sympathetic nerve activity in women more than men. This heightened sympathetic response in women may explain their greater age-related risk of cardiovascular disease.
Area of Science:
- Cardiovascular Physiology
- Neuroscience
- Gerontology
Background:
- Cardiovascular disease risk increases with age, particularly in women.
- The underlying mechanisms for this sex-based difference are not fully understood.
- Sympathetic nervous system activity is a key regulator of cardiovascular function.
Purpose of the Study:
- To investigate whether aging impacts sympathetic nerve activity differently in women compared to men.
- To determine if increased sympathetic activity in women contributes to their higher cardiovascular disease risk with age.
Main Methods:
- Measured muscle sympathetic nerve activity (MSNA), blood pressure, and heart rate in 120 healthy men and 96 healthy women aged 20-72 years.
- Analyzed the relationship between age and MSNA, considering sex differences.
- Examined the association between MSNA and blood pressure in relation to age and sex.
Main Results:
- Muscle sympathetic nerve activity (MSNA) increased with age in both sexes.
- Age explained a significantly larger proportion of MSNA variance in women (53%) than in men (8%).
- Women exhibited a greater age-related increase in MSNA (6.5 bursts/min per decade) compared to men (2.6 bursts/min per decade).
- Higher MSNA was associated with greater blood pressure increases in women than in men, especially after age 40.
- Menopausal status did not account for the observed age-related increase in sympathetic traffic.
Conclusions:
- Aging is associated with a more pronounced increase in sympathetic nerve activity in women than in men.
- These sex-specific differences in sympathetic neural aging may contribute to the greater impact of age on blood pressure and cardiovascular disease risk in women.
- Sympathetic nervous system dysregulation with aging represents a critical factor in understanding sex differences in cardiovascular disease progression.