BackgroundThe digit ratio (2D:4D), the ratio of the lengths of second (2D) to the fourth (4D) fingers, is a proxy indicator of prenatal androgen exposure. On average, males display lower 2D:4D than females. Previous studies have shown that lower 2D:4D ratios were associated with better sports and physical abilities.AimTo assess whether a challenge condition, imposed by intense exercise, could increase handgrip strength (HGS) associated with 2D:4D.MethodsThis cross‐sectional experimental study included 90 healthy young Polish adults (40 males, 50 females). They underwent intense physical exercise, before (7 days) and after which they were measured for HGS and 2D:4D. Height and weight were also measured. Analyses of Covariance were employed to delineate associations.Results2D:4D had significant predictive effects on the differences in HGS (DHGS) measured in two occasions, without and after, physical exercises. The lower was the 2D:4D, the higher the DHGS, particularly, for the left hand.ConclusionThe results reconfirmed that the link between prenatal testosterone exposure (indicated by 2D:4D) and physical strength depends on the context, such as a challenged condition.

中文翻译：

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体育锻炼后握力的变化由手指比例 (2D:4D) 调节：一项针对波兰年轻人的研究

背景手指比例 (2D:4D)，即第二根手指 (2D) 与第四根手指 (4D) 的长度之比，是产前雄激素暴露的替代指标。平均而言，男性的 2D:4D 表现低于女性。先前的研究表明，较低的 2D:4D 比率与更好的运动和身体能力相关。目的是评估剧烈运动带来的挑战条件是否可以增加与 2D:4D 相关的握力 (HGS)。方法这项横断面实验研究包括 90 名健康的年轻波兰成年人（40 名男性，50 名女性）。他们在运动前（7 天）和运动后进行了 HGS 和 2D:4D 测量。还测量了身高和体重。采用协方差分析来描述关联。结果2D:4D 对在没有体育锻炼和体育锻炼后两种情况下测量的 HGS (DHGS) 差异具有显着的预测作用。 2D:4D 越低，DHGS 越高，尤其是左手。结论结果再次证实，产前睾酮暴露（由 2D:4D 表示）与体力之间的联系取决于具体情况，例如挑战状况。