Kim Tae Beom, Kim Khae Hawn
Department of Urology, Gachon University Gil Medical Center, Gachon University School of Medicine, Incheon, Korea.
J Exerc Rehabil. 2016 Dec 31;12(6):515-519. doi: 10.12965/jer.1632862.431. eCollection 2016 Dec.
Second to fourth digit ratio is the ratio of second to fourth digit length. It has been known that digit ratio is sexually dimorphic in humans, such that males tend to have lower digit ratio (longer fourth digits relative to second digits) than females. Digit ratio is thought to be a biomarker of the balance between fetal testosterone (FT) and fetal estrogen (FE) in a relatively narrow developmental window at the end of the first trimester of pregnancy. On the contrary, the relationships between digit ratio and levels of sex steroids in adults are not clear. Most correlational studies between digit ratio and adult sex steroids have revealed that this association is statistically not significant. However, for many years, a lot of researches showed negative relationships between digit ratio and sports performance such as rugby, surfing, rowing, sprinting, endurance, and hand grip strength. Here, we discuss possible mechanisms about the relationships between digit ratio and sports performance.
食指与无名指长度之比是食指长度与无名指长度的比值。已知在人类中，指长比存在性别差异，男性的指长比往往低于女性（相对于食指，无名指更长）。指长比被认为是妊娠头三个月末相对狭窄的发育窗口期内胎儿睾酮（FT）和胎儿雌激素（FE）平衡的生物标志物。相反，成年人的指长比与性类固醇水平之间的关系尚不清楚。大多数关于指长比与成人性类固醇的相关性研究表明，这种关联在统计学上并不显著。然而，多年来，许多研究表明指长比与橄榄球、冲浪、划船、短跑、耐力和握力等运动表现之间存在负相关关系。在此，我们讨论指长比与运动表现之间关系的可能机制。
