2d 4d ratio pubmed9/28/2023 It is proposed that voluntary choice of participation in a sport discipline by women could be linked to the 'organizational' effect of intrauterine testosterone exposure during prenatal growth. The second-to-fourth-digit (2D:4D) ratio has been widely used as a putative marker of prenatal exposure to testosterone in health, behavioral and sport sciences, but it has only been used few times regarding combat athletes. However, the judo/boxing group had significantly lower mean 2D:4D values than the aerobics group. The two groups showed similar physical fitness and body size. Physical fitness was assessed using Eurofit tests. Height, weight and second and fourth digit lengths were measured. Of them, 119 had voluntarily chosen aerobic exercise, and 48 opted for judo/boxing. This cross-sectional study included 167 female students from a military academy in Wrocław, Poland. Voluntary participation in judo/boxing in contrast to aerobics can be guided by such behaviours and thus have an association with lower 2D:4D. Boxing and judo are considered to be high-risk sports. Sensation- and/or thrill-seeking behaviours have also been found to be negatively associated with 2D:4D. Males generally have a lower 2D:4D than females. A lower 2D:4D indicates higher PT exposure and vice versa. The second-to-fourth digit length ratio (2D:4D) is an indicator of PT exposure. These attributes are often linked to prenatal testosterone (PT) exposure. Humans exhibit sex differences in competitiveness, sensation seeking and risk-taking attitude, which are required in sports.
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