Sitting leg vasculopathy: potential adaptations beyond the endothelium

Area of Science:

• Cardiovascular Physiology
• Cellular Biology
• Public Health

Background:

• Sedentary behavior, particularly prolonged sitting, is a significant risk factor for cardiovascular disease mortality.
• The precise mechanisms linking excessive sitting to cardiovascular risk are not fully understood.
• Previous research suggested endothelial dysfunction due to reduced leg blood flow shear stress.

Purpose of the Study:

• To review evidence on the mechanisms of prolonged sitting-induced leg vascular dysfunction.
• To explore the role of vascular smooth muscle cells (VSMCs) in this process.
• To identify potential therapeutic targets for mitigating the vascular effects of sedentary behavior.

Main Methods:

• Review of classic and recent studies on prolonged sitting and vascular function.
• Analysis of evidence implicating vascular smooth muscle cell (VSMC) changes.
• Examination of studies on endothelial function and flow-mediated dilation.

Main Results:

• Prolonged sitting may cause leg vascular dysfunction through alterations in vascular smooth muscle cells (VSMCs).
• Evidence suggests actin filament polymerization and inward remodeling of resistance arteries occur with prolonged sitting.
• These VSMC changes manifest within timeframes consistent with observed vascular alterations.

Conclusions:

• Vascular smooth muscle cell (VSMC) cytoskeletal remodeling is a likely contributor to leg vascular dysfunction from prolonged sitting.
• Understanding these VSMC changes could lead to new strategies for preventing cardiovascular complications of sedentary behavior.
• Targeting VSMC cytoskeletal remodeling may offer a novel approach to counteract the detrimental vascular effects of excessive sitting.