Acute Effects of Low-Intensity Electrical Stimulation on Segmental Arterial Stiffness

Area of Science:

• Cardiovascular Physiology
• Neuromuscular Electrical Stimulation

Background:

• Electrical muscle stimulation (EMS) is recognized for enhancing muscle strength and glucose uptake.
• The potential of EMS to mitigate arterial stiffness is less understood, particularly concerning low-intensity applications.
• Investigating low-intensity EMS effects on systemic and regional arterial stiffness is crucial for understanding its vascular benefits.

Purpose of the Study:

• To evaluate the impact of low-intensity EMS applied to the lower limbs on segmental arterial stiffness.
• To compare the effects of EMS on various arterial stiffness indices, including CAVI, CAVI0, and PWV measurements.

Main Methods:

• A randomized controlled trial involving 14 healthy subjects comparing a control trial (CT) with an electrical stimulation trial (ET).
• Low-intensity EMS was administered to the lower limbs at 4 Hz for 20 minutes, targeting a heart rate increase of ~15 bpm.
• Arterial stiffness was assessed using cardio-ankle vascular index (CAVI), CAVI0, heart-ankle PWV (haPWV), brachial-ankle PWV (baPWV), heart-brachial PWV (hbPWV), and carotid-femoral PWV (cfPWV) before and after interventions.

Main Results:

• Control trial (CT) showed no significant changes in arterial stiffness parameters.
• Electrical stimulation trial (ET) significantly reduced CAVI, CAVI0, haPWV, and baPWV immediately post-intervention (p < 0.01).
• No significant changes were observed in hbPWV or cfPWV, and ankle blood pressure decreased post-EMS.

Conclusions:

• Low-intensity EMS of the lower limbs effectively reduces arterial stiffness in the stimulated segments.
• The findings suggest EMS can be a targeted intervention for improving vascular health in specific regions.
• Further research is warranted to explore the long-term effects and broader applications of EMS in managing arterial stiffness.