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Int J Obes (Lond). 2006 Apr;30(4):711-4.

The 2nd-4th digit ratio (2D:4D) and neck circumference: implications for risk factors in coronary heart disease.

Author information

  • 1Department for Sociobiology/Anthropology, Institute for Zoology & Anthropology, University of Goettingen, Goettingen, Germany. bernhard.fink@ieee.org

Abstract

BACKGROUND:

The ratio of the lengths of the 2nd and 4th digit (2D:4D) is negatively related to prenatal and adult concentrations of testosterone (T). Testosterone appears to be a protective against myocardial infarction (MI) in men as men with low 2D:4D are older at first MI than men with high 2D:4D, and men with coronary artery disease have lower T levels than men with normal angiograms. Neck circumference (NC), a simple and time-saving screening measure to identify obesity is reported to be positively correlated with the factors of the metabolic syndrome, a complex breakdown of normal physiology characterized by obesity, insulin resistance, hyperlipidemia, and hypertension, and is therefore likely to increase the risk of coronary heart disease (CHD).

OBJECTIVE:

To investigate possible associations between 2D:4D ratios and NC in men and women.

RESEARCH METHODS AND PROCEDURES:

2D:4D ratios, NC, along with measures of waist and hip circumferences, body mass index (BMI), and waist-to-hip ratio was recorded from 127 men and 117 women.

RESULTS:

A significant positive correlation between 2D:4D and NC and was found for men but not for women after controlling for body mass index (BMI); the higher the ratio the higher the NC.

DISCUSSION:

This finding supports the suggestion of NC to serve as a predictor for increased risk for CHD as previously suggested. In addition, the present association suggests a predisposition for men towards CHD via 2D:4D as proxy to early sex-steroid exposure.

PMID:
16261185
[PubMed - indexed for MEDLINE]
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