"Passive exercise" using whole body periodic acceleration: effects on coronary microcirculation

Area of Science:

• Cardiovascular Physiology
• Non-invasive Cardiology
• Vascular Endothelial Function

Background:

• Whole body periodic acceleration (WBPA) is a novel passive exercise system designed to enhance endothelial function via increased pulsatile shear stress.
• Previous research suggests WBPA's potential benefits, necessitating further investigation into its specific effects on coronary circulation.

Purpose of the Study:

• To evaluate the short-term impact of WBPA on coronary flow reserve (CFR).
• To assess CFR changes using transthoracic Doppler echocardiography (TTDE) in healthy subjects and patients with coronary artery disease (CAD).

Main Methods:

• A cohort of 15 healthy subjects and 20 CAD patients underwent CFR assessment via TTDE.
• CFR was measured at baseline and post-WBPA, with hyperemic and basal diastolic flow velocities recorded in the left anterior descending coronary artery (LAD).
• CFR was calculated as the ratio of hyperemic to basal mean diastolic flow velocity.

Main Results:

• WBPA was safely administered to all 35 participants without adverse events or significant changes in heart rate or blood pressure.
• Overall CFR increased significantly from 3.3 ± 1.0 to 3.7 ± 1.1 (P < .001) after WBPA.
• In CAD patients, particularly those with significant LAD narrowing, WBPA also demonstrated a significant CFR improvement from 2.4 ± 0.4 to 2.7 ± 0.5 (P < .01).

Conclusions:

• WBPA effectively improves coronary flow reserve in both healthy individuals and patients suffering from coronary artery disease.
• The findings suggest WBPA as a potentially valuable non-invasive therapeutic modality for improving coronary microvascular function.