Respiratory Muscle Training to Improve Cerebrovascular and Immune Function

Overview

Millions of adults in America have too much body fat, resulting in obesity. Obesity is detrimental to health and causes disease. Obesity reduces brain health, which causes the brain to function less effectively. Additionally, a lack of exercise contributes to poorer brain health. Most individuals feel they do not have time to exercise. There is a need for a quicker type of training that improves brain health. Newly developed breathing exercises could be a time-efficient, cost-effective, and home-based practice to increase brain health. This practice acts as weightlifting for breathing muscles. These new breathing exercises have already been shown to increase heart health. Heart health is linked to brain health; if an intervention helps the heart, it is likely to also help the brain. It is currently unknown if breathing training can improve brain health in younger adults with obesity. The investigators will utilize the same 8-week program shown to improve heart health. Testing will be conducted before and after the breathing training. The first part of the study will determine if breathing exercises help brain health. Obesity also causes inflammation. This is measured via blood but affects the entire body. It is thought to cause some of the negative outcomes of obesity. By lowering inflammation, it is likely to improve overall health. Breathing exercises may reduce inflammation, but more research is required. The second part of this study will determine whether breathing exercises help reduce inflammation. This study will determine if brain health can be improved in adults with obesity. This could help 40% of American adults with obesity to live longer and healthier lives.

Obesity, a growing global epidemic in America, is linked to cerebrovascular dysfunction and increases the risk of stroke, the nation's fourth leading cause of death. Cerebrovascular dysfunction is defined by impaired cerebrovascular reactivity and reduced cerebral autoregulation. Inspiratory muscle strength training (IMST) has proven to be a time-efficient, effective, low-cost, and highly feasible intervention for improving peripheral vascular function. Given the link between the peripheral vasculature and cerebrovasculature systems, it is highly plausible that IMST may improve cerebrovasculature function. Emerging data show that in adults with elevated blood pressure, IMST improves cerebrovascular function. Thus, the study team will examine whether 8 weeks of IMST improves cerebrovascular function in otherwise healthy young adults with obesity. Aim 1 will test the hypothesis that IMST will favorably increase cerebrovascular reactivity and improve cerebral autoregulation. Obesity-induced cerebrovascular dysfunction may be driven by chronic low-grade inflammation resulting from excessive sympathetic signaling. Additionally, inflammation is associated with reduced immune function. In adults with obesity, the systemic immune-inflammation index is elevated and positively associated with all-cause mortality. Emerging studies show IMST has the potential to reduce sympathetic activity and improve inflammation status. Aim 2 will test the hypothesis that IMST will reduce inflammation and improve immune function in otherwise healthy young adults with obesity. It is hypothesized that IMST will improve cerebrovascular reactivity and autoregulation, suggesting improved cerebrovascular health. Additionally, IMST will reduce the systemic immune-inflammation index and improve immune function in otherwise healthy young adults with obesity. This project explores the potential of IMST as a time-efficient and cost-effective intervention to improve cerebrovascular function and mitigate inflammation-related immune dysfunction in adults with obesity, potentially enhancing healthspan and lifespan. These findings could inform public health initiatives targeting approximately 40% of American adults with obesity, improving overall cerebrovascular function in the short term and reducing stroke incidence later in life.