Paper Title
Digit Ratio (2D:4D) and Muscular Endurance: A Pilot Study in Taiwanese Schoolboys

Abstract
The aim of this study is to investigate the correlation between muscle endurance and the relative length of the second digit to the fourth digit (2D:4D) in a sample of Taiwanese children. Five hundred and seventy-two Taiwanese schoolboys were recruited in this study. This study analyzed the relationship between the 2D:4D ratio and muscle endurance. Muscle endurance was assessed using the 1-minute sit-up test. The lengths of the index and ring fingers of both hands were measured to calculate the 2D:4D ratio. The number of 1-minute sit-up test repetitionswas negatively correlated with the right 2D:4D ratios (r = – 0.109, p = 0.009, two-tailed Pearson correlation) and the left 2D:4D (r = – 0.127, p = 0.002). These results indicate the 1-minute sit-up test score was negatively correlated with the 2D:4D ratio. These findings might suggest prenatal testosterone exposure is negatively correlated with the muscular endurance in schoolchildren. Keywords - Digit ratio, finger length, human, muscle mass.