The effects of water-based circuit exercise training on vascular function in people with coronary heart disease.

Abstract

Impaired endothelial function in people with coronary heart disease (CHD) is associated with increased mortality. Water immersion can increase peripheral artery shear stress which may provide an additional stimulus to the endothelium during exercise. This study compared the effects of water-based circuit exercise training (WEX) and gym-based circuit exercise training (GEX) on vascular function in people with stable CHD. Participants were randomised to 12 weeks of WEX (n=20), GEX (n=20) or a control group (usual activities; n=12). Endothelium-dependent flow-mediated dilation (FMD) and glyceryl trinitrate-mediated dilation (GTN) of the brachial artery were assessed pre- and post-intervention. FMD increased following WEX [4.0% (3.0-5.1%) to 5.3% (4.1-6.5%); p=0.016], but was unchanged following GEX [4.9% (3.8-5.9%) to 5.0% (3.8-6.1%); p=0.822]. There were no between-group differences in the change in FMD and no significant changes in GTN-mediated dilation percentage. Triglycerides decreased following GEX [1.2 mmol.L-1 (1.0-1.4 mmol.L-1) to 1.0 mmol.L-1 (0.8-1.3 mmol.L-1); p=0.022], but there were no further differences in lipid profiles. WEX improved endothelial function of the brachial artery in people with stable CHD, suggesting that WEX is an effective alternative to gym-based exercise in people living with CHD, which may specifically address vascular health.