Integrated Multiomics Links Metabolic and Inflammatory Remodeling to Arterial Stiffness After the 4,486-km Trans Europe Footrace

RationaleRegular aerobic exercise protects against vascular aging and reshapes the circulating molecular milieu, but the relation between vascular function, circulating molecules, and exercise dose at extreme volumes remains poorly defined. The vascular and molecular consequences of chronic, multi-stage ultra-endurance running are particularly unclear. ObjectiveTo define circulating molecular signatures associated with vascular dysfunction following the 64-stage, 4,486-km Trans Europe Foot Race (TEFR). Methods and ResultsIntegrated multiomics analysis (proteomics, lipidomics, metabolomics) of plasma from 27 finishers revealed a coordinated systemic shift driving an oxidative phenotype. Specifically, we identified altered arginine metabolism and a universal upregulation of lipotoxic ceramides consistent with incomplete fatty acid oxidation. In conjunction, we identified upregulation of innate immune system pathways including the acute phase response and the complement system. Central pulse wave velocity (cPWV) increased significantly after the race, consistent with arterial stiffening. To test whether the post-race circulating milieu could directly influence vascular mechanics, naive murine aortic rings were incubated with participant plasma. Post-race plasma acutely increased aortic elastic modulus, and this effect was attenuated by the superoxide dismutase mimetic TEMPOL, supporting a ROS-dependent component. In human aortic endothelial cells (HAECs), post-race plasma increased reactive oxygen species generation without detectable changes in eNOS phosphorylation, total eNOS abundance, or stimulated nitric oxide production. Endothelial ROS responses were associated with components of the terminal complement pathway. ConclusionsExtreme multi-stage ultra-endurance exercise induces a distinct systemic milieu associated with arterial stiffening through ROS-sensitive mechanisms. This response is characterized by remodeling of arginine-related metabolism, ceramide accumulation, innate immune activation, and oxidative stress, without evidence of reduced measured eNOS abundance or stimulated NO production. These findings identify candidate molecular pathways linking prolonged metabolic stress to vascular dysfunction.