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What happens to a runner's body after running 230 km?

Original Title

Concurrent inflammatory, hemorheological and macrovascular responses to a 230-km ultramarathon: an exploratory study

Analysis v4

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Summary

After running a super long race, a runner's body gets super tired and sends out alarm signals like inflammation, thickens the blood a bit, and changes how blood flows in small vessels — but the big arteries stay stiff as usual.

Proposed Mechanism
IL-6-driven acute-phase response increasing fibrinogen and RBC aggregation
Supported by evidence
Exercise-induced nitric oxide bioavailability increasing peripheral vasodilation and altering wave reflection
Supported by evidence
Inflammatory cytokine-mediated suppression of circulating antioxidant capacity
Supported by evidence

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Publication

Authors

Grau M, Bruns J, John L, Munk M, Siebers M, Bloch W, Bizjak DA

Analysis v4
DOI:10.1038/s41598-026-55821-1
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