Right-left digit ratio (2D:4D) and maximal oxygen uptake.

Area of Science:

• Endocrinology
• Sports Science
• Human Biology

Background:

• The 2D:4D digit ratio is a proposed marker for prenatal androgen exposure.
• Low 2D:4D ratios, particularly right-left 2D:4D, are associated with "masculine" traits and androgen receptor gene variations.

Purpose of the Study:

• To investigate the association between the right-left 2D:4D digit ratio and athletic performance indicators in adolescent males.
• To explore if digit ratio can serve as a proxy for testosterone sensitivity and physical capacity.

Main Methods:

• Measured the 2D:4D digit ratio (second digit to fourth digit) for both hands in a sample of teenage boys.
• Assessed maximal oxygen uptake (VO2(max)), velocity at VO2(max), and maximum lactate concentration.
• Correlated digit ratio measurements with physiological performance data.

Main Results:

• A low right-left 2D:4D ratio was significantly associated with higher maximal oxygen uptake (VO2(max)).
• Lower right-left 2D:4D was also linked to increased velocity at VO2(max) and higher maximum lactate concentration.
• These findings suggest a connection between prenatal testosterone exposure markers and athletic capabilities.

Conclusions:

• Low right-left 2D:4D digit ratio in teenage boys is a potential indicator of enhanced aerobic capacity and performance potential in sports.
• This digit ratio may reflect heightened sensitivity to prenatal and circulating testosterone, contributing to superior athletic traits.