International Journal of Human Sciences ISSN:2458-9489 Volume 15 Issue 1 Year: 2018 The correlation between right hand finger ratio (2D:4D) and the parameters of anthropometric and physical fitness in children Nebahat Eler 1 Abstract It is hypothesized that there is a correlation between the ratio of second hand finger to fourth hand finger (2D:4D) which is an indicator of prenatal testosterone and physical fitness and sportive performance The aim of this study was to determined correlation between the right hand finger ratio (2D:4D) and the parameters of anthropometric and physical fitness in male and female children aged between 10 and 12. Six hundred and seventy eight males whose age average was 0.49±1.32 and 592 females whose age average was 10.38 ± 1.48 participated in this study. In addition to taking the students’ right hand 2D:4D, height, weight, triceps, subscapular, full arm and leg measurements, vertical jumping, standing long jump, flexibility, 20 m sprint, 10x5 agility, leg strength, right/left hand grip strength, 20 m shuttle run and balance tests were also performed. Statistically differences were found between anthropometric measurements apart from height and BMI, 2D:4D and physical fitness parameters in the males and females. A negative correlation between right hand 2D:4D and vertical jumping, standing long jump, 20 m sprint, 10x5 agility and right hand grip strength in the males. As for the females, although a negative correlation was detected between right hand 2D:4D and height, a positive correlation was found between the same variable and body fat ratio (p<0.05). It can be concluded that while a low 2D:4D ratio was correlated with static and explosive strength, speed and agility in the males, it was correlated with height and body fat ratio in the females. Keywords: 2D:4D; anthropometric measurement; physical fitness; children. Introduction That the testosterone and estrogen concentrations in the womb are at different levels affects the ratio of finger lengths in relation to each other in the children to be born (Manning et al., 1998; Wang, 2016; Kociuba et al., 2017; Ja Chau et al., 2015). As a sign of how much testosterone a human being was exposed to in the uterus, 2D:4D finger length ratios have been accepted (Powel, 2012; Ja Chao and Kim, 2015). Although 2D:4D is the same in males and females until the age of 2, it shows a difference after that age and it does not change neither in the puberty nor in the adulthood (Manning, 1998). However, according to a study carried out by Ja Cho et al., 2D:4D is the same in the males and females until the age of 4 (2015). 1 Ph.D., School of Physical Education and Sports, Bülent Ecevit University, Zonguldak, nebahateler@gmail.com Submitted: 2018-03-09 Published:2018-03-31