https://matteocampagna.com/en/registry/health/salivary-iga-competition-day Changes to this claim in Matteo Campagna's evidence registry: its status, its year-by-year history, revisions of the page. en-gb https://matteocampagna.com/en/registry/health/salivary-iga-competition-dayIn the two samples measured, salivary IgA, the antibody that guards the nose and throat, does not fall with competition. In eight Brazilian national team archers a simulated competition of 144 arrows does not separate it from a rest day at any of four samples, even though cortisol is higher after every distance. In forty archers at the Brazilian championship, with saliva collected on waking, IgA on the competition day is in fact higher than on the free practice day, with a medium effect, and it does not go with score (r=0.1). The picture is fragile, though: these are two master's theses from the same research group, the first has its figures only in charts, and both contradict themselves between abstract and results: the first lists IgA in its abstract among the measures the competition changes, while the second states that the difference is not significant even though its results give it at p below 0.01. It can be said that the drop expected in endurance sports was not seen here; it cannot be said that competition has no effect on immune defences, because nobody counted days of illness.claim:iga-salivare-gara:revision:2026-05-20:2Wed, 20 May 2026 08:00:00 GMT https://matteocampagna.com/en/registry/health/salivary-iga-competition-dayclaim:iga-salivare-gara:new_claim:2026-05-18:riportatoMon, 18 May 2026 08:00:00 GMT