010421 New publi

Differential impacts of trail and ultra-trail running on cytokine profiles: An observational study

Authors : Sarah Skinner, Elie Nader, Emeric Stauffer, Mélanie Robert, Camille Boisson, Agnès Cibiel, Clément Foschia, Léonard Feasson, Paul Robach, Guillaume Y Millet, Philippe Connes.

Published : 01 April 2021 - Clin Hemorheol Microcirc.


Background: Endurance running events are known to cause inflammation and result in increased cytokine production. However, the effects of ultramarathons on cytokine profiles are not well characterized.

Objective: The aim of this study was to describe and compare the effects of a trail (40 km) race and an ultra-trail (171 km) race on leukocyte concentrations and cytokine profiles.

Methods: The study was conducted during the Ultra-Trail du Mont Blanc® ultra-marathon running event, and included 11 runners who completed the 40 km trail run and 12 runners who completed the 171 km ultra-trail. Blood samples were taken before and after the races.

Results: Leukocyte concentrations significantly increased after both races. Circulating levels of IL-6, IL-1β, MCP-1, and IFN-γ were significantly higher after the longer race compared to the shorter race. Furthermore, while both races resulted in significant increases in IL-6 and IL-8, only the longer race resulted in significant increases in MIP-1β, IL-7, IL-17a, and IL-4.

Conclusions: These results illustrate that a 171 km ultra-trail race results in greater modulations in cytokine profiles than a traditional trail race.

Keywords : Running; cytokines profile; exercise; inflammation; leukocytes; ultra-trail.

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