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Variation in digit ratio (2D:4D) across different types of military services in Poland
Marek Kociuba1, Sławomir Kozieł2, Raja Chakraborty3
1Department of Physical Education and Sports, General Tadeusz Kościuszko Military University of Land Forces, Wroclaw, Poland.
Background:
The relationship between the second (2D) and fourth finger (4D) of the hand (2D:4D) is considered to be a proxy indicator of prenatal- testosterone (PT) and estrogen (PE) exposure in the first trimester of pregnancy. A lower 2D:4D indicates relatively higher PT exposure and vice versa. The 2D:4D is generally higher in women than in men. Lower 2D:4D is associated with greater physical ability, strength, better athletic performance, and a propensity for jobs that require more physical fitness and are more risky.
Aim:
The aim of the present study was to examine the differences in 2D:4D, if any, between three groups of men in Poland: military students (N = 250), soldiers of the Land Forces (N = 106) and volunteers of the Territorial Defense Force (N = 202).
Method:
This cross-sectional study was carried out in Military University of Land Forces (MULF) in Wroclaw, Poland. The measurements included body height, body weight and the lengths of the second and fourth fingers in both hand of each participant.
Results:
The results showed significantly lower 2D:4D in land forces soldiers and military students than those belonged to the Territorial Defense Force.
Conclusion:
The results indicated the possible impact of fetal androgens on specific human abilities as well as choices for challenging occupations.
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