https://matteocampagna.com/en/registry/physical-training/archery-muscle-asymmetries 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/physical-training/archery-muscle-asymmetriesElectromyography shows that the load of the shot is asymmetric: during the draw the string arm uses more latissimus dorsi and biceps, the bow arm more lateral deltoid and triceps. Whether that load leaves an asymmetric body is a separate question, and the answer depends on the part of the body. In the arms and hands asymmetry is found: in 13 young Turkish archers the drawing side is stronger, with small differences in the large shoulder and elbow movements (d from 0.2 to 0.6) and in hand grip (30.4 against 28.8 kilograms, d 0.21), very marked ones in the finger pinches (d up to 1.7), and tighter external shoulder rotators; in 20 young Malaysian archers the grip gap between the two hands is 6 kg against 1.3 in sedentary peers, but that gap was never tested and the archers were heavier. In the trunk and spine it is not: no scoliosis in the 30 kyudo practitioners with complaints who were examined and X-rayed, the same thickness of the deep muscles on both sides on ultrasound in 15 young elite archers, the same endurance of the lateral trunk muscles in the 13 Turkish archers. No study has followed the same archers over time, and almost all compare the right side with the left in right-handed people, who have a difference between the hands even without a bow. The only before-and-after comparison over twelve weeks of shooting, on an arm precision task, saw no change in the difference between the two sides. The studies of archers point in opposite directions.claim:tiro-crea-asimmetrie:revision:2026-01-31:2Sat, 31 Jan 2026 08:00:00 GMT https://matteocampagna.com/en/registry/physical-training/archery-muscle-asymmetriesclaim:tiro-crea-asimmetrie:new_claim:2026-01-12:contestatoMon, 12 Jan 2026 08:00:00 GMT