Examining oxidative stress as a mechanistic link between sleep irregularity and cardiovascular risk in young adults...

Chronic anxiety is a highly prevalent condition in young adults that is often associated with irregular sleep patterns, potentially augmenting cardiovascular disease (CVD) risk. Sleep irregularity is significantly associated with elevated oxidative stress and lower vascular function and blood pressure control in individuals with chronic anxiety. This study examined whether these impairments in vascular function and blood pressure control are driven by elevations in oxidative stress. Twenty-five young adults (24 ± 4 yr) with generalized anxiety disorder (GAD) or elevated GAD symptoms were assessed for total sleep time irregularity (TSTI) via wrist-worn accelerometry and separated into high TSTI and low TSTI groups via median split. Precursors to CVD development including oxidative stress (whole blood superoxide levels), vascular function (exercise-induced flow-mediated dilation), and blood pressure control (cardiovagal baroreflex sensitivity) were evaluated in both groups following both acute antioxidant (alpha-lipoic acid, vitamin C, and vitamin E) or placebo (microcrystalline cellulose) supplementation. The high TSTI group displayed significantly greater oxidative stress, significantly lower vascular function, and significantly lower blood pressure control. Following antioxidant supplementation, oxidative stress and blood pressure control were significantly improved in the high TSTI group, whereas vascular function was significantly improved independent of group. Antioxidant supplementation reduced oxidative stress and normalized blood pressure control differences between groups, implicating oxidative stress as a key mechanism linking sleep irregularity and CVD risk in young adults with chronic anxiety.NEW & NOTEWORTHY This study is the first to identify oxidative stress as a mediator of early cardiovascular disease (CVD) risk associated with total sleep time irregularity (TSTI) in young adults with chronic anxiety. Antioxidant supplementation reduced oxidative stress and improved blood pressure regulation in the high TSTI group. These findings suggest that oxidative stress plays a central role in linking chronic anxiety, sleep irregularity, and elevated CVD risk.