Digit Ratio (2d4d) and Performance in Indian Swimmers.

ABSTRACT

It has been suggested that achievement in sports is correlated with a putative measure of prenatal testosterone the 2nd to 4th digit ratio (2D 4D). It has been shown that digit ratio (2D 4D) is negatively associated with prenatal testosterone, and it is also negatively associated with ability in sports. This study examined associations between 2D 4D and performance of both male and female National level Indian swimmers. Age matched non-sports personnel formed the control. Lengths of second and fourth digits were measured after scanning both hands and their ratio calculated. Our results show lower 2D4D values in males compared to females (P<0.05). Among male, but not female, swimmers had significantly (P<0.05) lower 2D 4D ratio. Low 2D 4D in male swimmers suggests they are more prenatally programmed via long-lasting extra genital effects of testosterone. 2D 4D ratio could be used to identify young sports personnel who have potential to reach high levels of performance.