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Understanding the vascular health impact of upper-body exercise
Secondary Supervisor(s): Dr Alex Wadley
University of Registration: University of Birmingham
BBSRC Research Themes:
Project Outline
According to the World Health Organisation, approximately 1.8 billion adults were physically inactive in 2022, with this number projected to increase progressively year on year. A lack of physical exercise has negative implications for vascular health and is associated with cardiovascular disease morbidity and mortality. Repetitive exercise serves as a modifiable lifestyle intervention to improve vascular structure and function, thereby potentially minimising the economic burden of inactivity-related chronic diseases.
Acute exercise is a potent non-pharmacological stimulus to drive beneficial vascular changes. This is primarily through increased blood flow and pressure during exercise, which generates shear stress, nitric oxide bioavailability, the release of neurotrophic factors and an influx of circulating endothelial progenitor cells (EPCs). While the magnitude of these responses can be influenced by exercise intensity and duration, currently little is known regarding the influence of upper compared to lower-body exercise modalities. Intuitively, the smaller muscle mass, lower mechanical efficiency and greater symathoexcitation with arm exercise will result in different responses. Even less is known regarding differences in long-term central or limb-specific vascular health changes in response to a prolonged upper or lower-body aerobic exercise intervention. Understanding these physiological responses has implications for individuals that are primarily restricted to upper-body exercise, such as people with a lower-limb disability (e.g., spinal cord injury), mobility restrictions (e.g., older adults) or exercise intolerance (e.g., peripheral artery disease).
Objectives
Aim 1. To compare haemodynamic, neurotrophic and EPC responses to both absolute and relative intensity-matched acute bouts of upper and lower-body aerobic exercise.
Aim 2. To establish central and limb-specific vascular health benefits of an upper compared to lower-body exercise intervention.