The letter discusses a study on the relationship between digit ratio (2D:4D) and adult running speed in Jamaicans. It suggests that digit ratio may be a useful childhood biomarker for endurance running in adults. The study, part of the Jamaican Symmetry Project, measured 2D:4D in 1996, 2002, and 2010, and analyzed its correlation with running performance in races. Results indicated that low 2D:4D is associated with better endurance running, particularly in females.
documents/EFTA00620045.pdf
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