https://matteocampagna.com/en/registry/health/caffeine-accuracy 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/caffeine-accuracyThere are two studies in archers and they do not agree. In 2017 six Korean middle-school boys, after a sleepless night, shot 339 points at 30 metres with 2.5 milligrams of caffeine per kilo and 335 with a placebo given blind, a difference the analysis cannot tell apart from chance. In 2026 twelve university recurve archers shot 8.33 points per arrow after two hundred milligrams against 6.61 in the session without, a huge jump. The second has the weaker design: no placebo, no randomisation and a starting score, a little over six and a half per arrow at eighteen metres, so low that simply getting into the swing of it remains an open explanation. The first is tiny and measures caffeine in boys who had not slept, which is a narrower question; in both, caffeine always came last. Outside archery, seven elite clay target shooters, double-blind with placebo, did not improve their scores and reported headache, anxiety and tremor, which in a sport of holding steady weigh more than the hoped-for gain; neither there nor in the Korean boys did caffeine raise heart rate.claim:caffeina-precisione:revision:2026-09-21:3Mon, 21 Sep 2026 08:00:00 GMT https://matteocampagna.com/en/registry/health/caffeine-accuracy#storiaThe second study in archers arrives, and it points the opposite way to the first: twelve university recurve archers shoot 8.33 points per arrow after two hundred milligrams of caffeine against 6.61 in the session without, a large effect, although in three ends out of ten the difference is not significant. The design is weak, though: no placebo, no randomisation and the caffeine session always second, on a starting score so low that getting into the swing of it remains an open explanation. There are now two studies in archers and they disagree: the one with a blinded placebo, in six boys short of sleep, finds nothing; the one without a placebo, in twelve adults, finds a huge jump. Contestato.claim:caffeina-precisione:status_change:2026-08-03:contestatoMon, 03 Aug 2026 08:00:00 GMT https://matteocampagna.com/en/registry/health/caffeine-accuracyclaim:caffeina-precisione:new_claim:2026-05-18:contraddettoMon, 18 May 2026 08:00:00 GMT