The letter discusses a study on the relationship between digit ratio (2D:4D) and adult running speed in Jamaicans. It highlights that low 2D:4D, which is linked to higher prenatal testosterone, may predict better endurance running performance. The study, part of the Jamaican Symmetry Project, measured 2D:4D in 1996, 2002, and 2010, and found correlations between low 2D:4D and faster 180m race times relative to 90m times, especially in females.
documents/EFTA00620049.pdf
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