High-Fat, High-Sugar Diet-Induced Subendothelial Matrix Stiffening is Mitigated by Exercise.

Area of Science:

• Cardiovascular Physiology
• Vascular Biology
• Exercise Science

Background:

• High-fat, high-sugar diets and sedentary behavior are linked to arterial stiffening.
• Clinical assessments of arterial stiffness do not capture cellular-level tissue changes.
• Subendothelial matrix compliance is critical for vascular permeability and atherosclerosis initiation.

Purpose of the Study:

• To investigate the combined effects of a high-fat, high-sugar diet and lifestyle interventions on arterial stiffness at both macro- and micro-scales.
• To compare the efficacy of diet reversal versus aerobic exercise in mitigating diet-induced arterial stiffening in mice.

Main Methods:

• Mice were fed a high-fat, high-sugar diet and subsequently treated with either aerobic exercise or diet reversal.
• Bulk arterial stiffness was quantified using pulse wave velocity measurements.
• Subendothelial matrix stiffness was assessed ex vivo using atomic force microscopy.

Main Results:

• Diet reversal effectively reduced both macro- and micro-scale arterial stiffening induced by the high-fat, high-sugar diet.
• Aerobic exercise significantly decreased micro-scale subendothelial matrix stiffness but did not alter macro-scale stiffness within the study period.
• Combined lifestyle factors impact vascular health differently at macro- and micro-levels.

Conclusions:

• Both a healthy diet and regular exercise are essential for maintaining overall vascular health.
• Exercise can partially reverse diet-induced micro-scale vascular damage, even if macro-scale indicators remain unchanged.
• Targeting both diet and exercise is crucial for comprehensive cardiovascular health management.