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SEX DIFFERENCES IN DIGIT RATIO (2D:4D) AMONG MILITARY AND CIVIL COHORTS AT A MILITARY ACADEMY IN WROCŁAW, POLAND

Published online by Cambridge University Press:  23 November 2015

Marek Kociuba ,
Slawomir Kozieł  and
Raja Chakraborty
Marek Kociuba
Affiliation:
General Tadeusz Kuściuszko Military Academy of Land Forces, Wrocław, Poland
Slawomir Kozieł
Affiliation:
Polish Academy of Science Anthropology Unit in Wrocław, Poland
Raja Chakraborty*
Affiliation:
Department of Anthropology, Dinabandhu Mahavidyalaya, Bongaon, West Bengal, India
*
1Corresponding author. Email: [email protected]
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Summary

The ratio of second-to-fourth digit length (2D:4D), which is generally higher in women compared with men, is a putative marker of prenatal testosterone (PT) exposure. Lower 2D:4D is linked with greater physical ability and strength, better sporting performance and a propensity towards jobs demanding greater physical ability. The objectives of this paper were to examine the sexual dimorphism in 2D:4D in both hands 1and compare this dimorphism in the students of military and civil courses at the General Kuściuszko Military Academy of Land Forces in Wrocław. The cross-sectional study compared 59 female and 118 male students from the military courses and 53 females and 64 male students from the civil courses. Besides calculating 2D:4D (2D/4D) for each hand, height and weight were also recorded. Physical fitness and endurance were assessed using Eurofit tests. Handgrip strength was measured using a standardized isometric dynamometer. In almost all physical tests, students in the military cohort showed highly significant greater physical ability and strength (e.g. handgrip strength) when compared with the civil cohort. Male participants had a significantly lower 2D:4D than females for each hand, as well as for the average value for both hands. The sexual dimorphism was, however, a little more pronounced in the right hand than in the left. Both sex and course type were significant predictors of 2D:4D. There were significant interactions between sex and the student type. Among females, but not in males, the military cohort had a significantly lower, i.e. more ‘masculine’, 2D:4D for the left hand and right hand and average for both hands (t=3.290, p<0.001) than the civil cohort. This was not the case in males. However, the sex difference in 2D:4D was only significant among the civil students, and not among the military cadets. In conclusion, higher PT exposure, as represented by a lower 2D:4D, among the Polish females might be an indicator of relatively increased physical ability and motivation to choose professions that require higher strength and endurance.

Type
Research Article
Information
Journal of Biosocial Science , Volume 48 , Issue 5 , September 2016 , pp. 658 - 671
Copyright
Copyright © Cambridge University Press, 2015 

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References

Auger, J., Le Denmat, D., Berges, R., Doridot, L., Salmon, B., Canivenc-Lavier, M. C. & Eustache, F. (2013) Environmental levels of estrogenic and antiandrogenic compounds feminize digit ratios in male rats and their unexposed male progeny. Proceedings of the Royal Society: Biological Sciences 280(1768), 20131532.Google Scholar
Cohen-Bendahan, C. C., van de Beek, C. & Berenbaum, S. A. (2005) Prenatal sex hormone effects on child and adult sex-typed behavior: methods and findings. Neuroscience and Biobehaviour Review 29, 353–384.Google Scholar
Ertuğrul, B. (2012) Sexually dimorphic human body fat distribution and second-to-fourth digit ratio. Eurasian Journal of Anthropology 3, 54–62.Google Scholar
Eurofit (1993) Eurofit: Handbook for the Eurofit Tests of Physical Fitness. Council of Europe, Strasbourg.Google Scholar
Figler, S. K. (1981) Sport and Play in American Life. Sunders College Publishing, Philadelphia.Google Scholar
Fink, B., Neave, N. & Manning, J. (2003) Second to fourth digit ratio, body mass index, waist-to-hip ratio, and waist-to-chest ratio: their relationships in heterosexual men and women. Annals of Human Biology 30, 728–738.Google Scholar
Galis, F., Ten Broek, C. M., Van Dongen, S. & Wijnaendts, L. C. (2010) Sexual dimorphism in the prenatal digit ratio. Archives of Sexual Behavior 39, 57–62.Google Scholar
Goodyear, M. D. E., Krleza-Jeric, K. & Lemmens, T. (2007) The Declaration of Helsinki. British Medical Journal 335, 624–625.Google Scholar
Govier, E. (2003) Brainsex and occupation: the role of serendipity in the genesis of an idea. Journal of Managerial Psychology 18, 440–452.CrossRefGoogle Scholar
Hines, M. (2000) Gonadal hormones and sexual differentiation of human behaviour: effects on psychosexual and cognitive development. In Matsumoto, A. (ed.) Sexual Differentiation of the Brain. CRC Press, FL, pp. 257–278.Google Scholar
Hönekopp, J. & Schuster, M. (2010) A meta-analysis on 2D:4D and athletic prowess: substantial relationships but neither hand out-predicts the other. Personality and Individual Differences 48, 4–10.Google Scholar
Huh, H. R. (2012) Born to be a marine: digit ratio and military service. Personality and Individual Differences 53, 166–168.Google Scholar
Lohman, T. G., Roche, A. F. & Martorell, R. (1988) Anthropometric Standardization Reference Manual. Human Kinetics, Champaign, IL.Google Scholar
Lutchmaya, S., Baron-Cohen, S., Raggatt, P., Knickmeyer, R. & Manning, J. T. (2004) 2nd to 4th digit ratios, fetal testosterone and estradiol. Early Human Development 77, 23–28.Google Scholar
McIntyre, M. H., Ellison, P. T., Lieberman, D. E., Demerath, E. & Towne, B. (2005) The development of sex differences in digital formula from infancy in the Fels Longitudinal Study. Proceedings of the Royal Society: Biological Sciences 272, 1473–1479.Google Scholar
Malas, M. A., Dogan, S., Evcil, E. H. & Desdicioglu, K. (2006) Fetal development of the hand, digits and digit ratio (2D:4D). Early Human Development 82, 469–475.Google Scholar
Manning, J. T. (2002) Digit Ratio: A Pointer to Fertility, Behaviour and Health. Rutgers University Press, New Brunswick.Google Scholar
Manning, J. T. (2011) Resolving the role of prenatal sex steroids in the development of digit ratio. Proceedings of the National Academy of Sciences of the USA 108, 16143–16144.Google Scholar
Manning, J. T., Reimers, S., Baron-Cohen, S., Wheelwright, S. & Fink, B. (2010) Sexually dimorphic traits (digit ratio, body height, systemizing-empathizing scores) and gender segregation between occupations: evidence from the BBC internet study. Personality and Individual Differences 49, 511–515.Google Scholar
Manning, J. T., Scutt, D., Wilson, J. & Lewis-Jones, D. I. (1998) The ratio of 2nd to 4th digit length: a predictor of sperm numbers and concentrations of testosterone, luteinizing hormone and estrogen. Human Reproduction 13, 3000–3004.Google Scholar
Manning, J. T. & Taylor, R. P. (2001) 2nd to 4th digit ratio and male ability in sport: implications for sexual selection in humans. Evolution and Human Behaviour 22, 61–69.Google Scholar
StatSoft Inc. (2010) STATISTICA Version 10.0. Statsoft Inc., Tulsa, OK. URL: www.statsoft.com.Google Scholar
Sudhakar, H. H., VeenaUmesh, B. & Nadig, T. R. (2013) Digit ratio (2D:4D) and performance in Indian swimmers. Indian Journal of Physiology and Pharmacology 57, 72–76.Google Scholar
Trivers, R., Hopp, R. & Manning, J. (2013) A longitudinal study of digit ratio (2D:4D) and its relationships with adult running speed in Jamaicans. Human Biology 85, 623–626.Google Scholar
Trivers, R., Manning, J. & Jacobson, A. (2006) A longitudinal study of digit ratio (2D:4D) and other finger ratios in Jamaican children. Hormones and Behavior 49, 150–156.Google Scholar
Zhao, D., Yu, K., Zhang, X. & Zheng, L. (2013) Digit ratio (2D:4D) and handgrip strength in Hani ethnicity. PLoS One 8, e77958.Google Scholar
Zheng, Z. & Cohn, M. J. (2011) Developmental basis of sexually dimorphic digit ratios. Proceedings of the National Academy of Sciences of the USA 108, 16289–16294.Google Scholar