Lifelong Physical Activity Determines Vascular Function in Late Postmenopausal Women

Area of Science:

• Cardiovascular Physiology
• Exercise Science
• Aging Research

Background:

• Postmenopausal women experience vascular dysfunction, increasing cardiovascular risk.
• Lifelong physical activity is a potential modulator of vascular health in aging.
• Understanding the impact of physical activity on leg vasculature is crucial for preventative strategies.

Purpose of the Study:

• To investigate the association between lifelong physical activity levels and leg vascular function in postmenopausal women.
• To assess endothelial-dependent and smooth muscle-dependent vascular responses in relation to physical activity.
• To explore the synthesis of key vasodilators, prostacyclin and nitric oxide (NO), in different activity groups.

Main Methods:

• Cross-sectional study design comparing inactive, moderately active, and very active postmenopausal women.
• Ultrasound Doppler assessment of femoral artery function during vasoactive agent infusion (acetylcholine, sodium nitroprusside, epoprostenol).
• Analysis of thigh muscle biopsies and plasma samples for vasodilator system components.

Main Results:

• Very active women exhibited significantly greater endothelial-dependent responsiveness to acetylcholine (76% increase) and 200% higher prostacyclin synthesis.
• No significant differences in smooth muscle-dependent responsiveness were observed between groups.
• Higher protein levels of endothelial nitric oxide synthase (eNOS) and antioxidant enzymes were found in very active individuals.

Conclusions:

• Lifelong physical activity is a key determinant of leg vascular function in late postmenopausal women.
• The extent of physical activity influences the capacity for prostacyclin and nitric oxide production.
• Maintaining high physical activity levels may preserve vascular health and mitigate age-related decline.