https://matteocampagna.com/en/registry/technique/posterior-deltoid-middle-trapezius-aiming 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/technique/posterior-deltoid-middle-trapezius-aimingTwo samples from 2024 point to these two muscles, but neither is a recurve sample. In 24 Malaysian compound archers the posterior deltoid and the middle trapezius on the string side are the muscles in which most archers hold a sustained contraction during the shot, 74.6 and 68.6 per cent of the archers according to the authors, and the middle deltoid is the least active; in 20 Polish traditional archers measured while aiming the posterior deltoid gives the largest signal. The limits are concrete: the Polish study compares different muscles in microvolts, without normalising them, and the Malaysian one measures the whole shot rather than the aim alone, and on average finds the anconeus of the bow arm the most active in the elite and junior groups. For elite recurve the measurements are few and small: in eight French archers, in the three for whom the value is reported, the bow-arm middle deltoid works at between 46 and 66 per cent of maximum contraction while aiming, and on the worse arrows the string-side posterior deltoid and middle trapezius are more active, not less. That these two muscles are among the hardest-working is documented; that they do most of the work on their own, and that more work is better, is not.claim:deltoide-posteriore-in-mira:revision:2026-10-13:3Tue, 13 Oct 2026 08:00:00 GMT https://matteocampagna.com/en/registry/technique/posterior-deltoid-middle-trapezius-aimingclaim:deltoide-posteriore-in-mira:new_claim:2026-09-08:riportatoTue, 08 Sep 2026 08:00:00 GMT