![]() ![]() Subjects consisted of 215 males and 190 females with mean age. Using a cross-sectional design, this study quantified the relationship between the digit ratio (2D:4D) and muscular strength in 57 adolescent boys. Also, the authors have discussed the relevant molecular basics and the methods of measurement of digit ratios.ĭigit ratio Prenatal androgen Testosterone Vernier calipers. This present study investigated the association between 2D:4D ratio and birth weight in Nigerians. The majority of the studies have shown lower 2D:4D ratios in individuals with ASD (Al-Zaid et al. The negative relationship between 2D:4D and PTE has been confirmed with various methods. A smaller 2D:4D is associated with higher PTE and men in general have lower ratios than women (Lutchmaya et al. 2005), which purports an influence of fetal testosterone exposure on the development of ASD. (2D:4D or digit ratio) is employed as an indirect somatic marker of PTE (Goy and McEwen 1980). The authors have attempted to write a brief account on the digit ratios and the dimorphism observed in various physiological, psychological and behavioural traits. A BSTRACT >8 Because Digit Ratio (2D :4D ) is a simple and effective index for invest igat ing the gender differences in the field of physiological anthropology, this study was de signed to examine the relation between 2D :4D and BMI (Body Mass Index), the latter being regarded as a useful biomarker. The 2D:4D ratio in relationship to ASD has been exam-ined, in part, due to the extreme male brain theory (Baron-Cohen et al. Prenatal androgen exposure and therefore, digit ratios have been reported to be associated with numerical competencies, spatial skills, handedness, cognitive abilities, academic performance, sperm counts, personalities and prevalence of obesity, migraine, eating disorders, depression, myopia, autism etc. Usually, males have lower ratios when compared to females. Interestingly, it is constant since birth and not influenced by the adult hormone levels. This study involved 200 male elite combat athletes (Olympic wrestling, kickboxing, judo, taekwondo and karate) and 179 males not participating in any sports. Ratio of 2D:4D is found to correlate negatively to testosterone and positively to oestrogen in the foetus. Existing literature and recent research show accumulating evidence on 2D:4D ratio showing correlations with various phenotypic traits in humans. In our study, both 2D and 4D lengths were significantly different between sexes but there was no correlation between digit ratio and the sum of 2D + 4D lengths. Digit ratios, especially 2D:4D ratio, a potential proxy marker for prenatal androgen exposure shows sexual dimorphism. ![]()
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