Right-left digit ratio (2D:4D) predicts free testosterone levels associated with a physical challenge

L.P. Kilduff, C.J. Cook, M. Bennett, Blair Crewther, Richard M Bracken, J. Manning

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

There is evidence that the digit ratio (2D:4D) is a negative correlate of prenatal levels of testosterone, but there is no association between 2D:4D and the circulating levels of both total and free testosterone. Sports provide a physical challenge and participants often show increased levels of free testosterone immediately preceding and during competition. We tested this hypothesis of a link between 2D:4D and testosterone under challenge in 79 professional rugby players using the following procedures; (i) 25 players were physically challenged using a repeated sprint agility test, and saliva samples were assayed for testosterone immediately preceding the repeated sprint agility test (time 1) and 5 minutes (time 2) and 20 minutes after completion of the repeated sprint ability (time 3); (ii) 54 players were also tested for salivary testosterone in an unchallenged condition. We found that right-left 2D:4D was significantly and negatively related to testosterone concentrations at times 1, 2 and 3 following the repeated sprint agility test (P <0.05) and there was no association between the 2D:4D and basal testosterone levels in the unchallenged group. We suggest that low right-left 2D:4D is a predictive marker of free testosterone responsiveness when trained men are physically challenged, and that this association is programmed by the action of prenatal testosterone. © 2013 Copyright Taylor and Francis Group, LLC.
Original languageEnglish
Pages (from-to)677-683
Number of pages7
JournalJournal of Sports Sciences
Volume31
Issue number6
DOIs
Publication statusPublished - 2013
Externally publishedYes

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Testosterone
Disabled Persons
Football
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Kilduff, L. P., Cook, C. J., Bennett, M., Crewther, B., Bracken, R. M., & Manning, J. (2013). Right-left digit ratio (2D:4D) predicts free testosterone levels associated with a physical challenge. Journal of Sports Sciences, 31(6), 677-683. https://doi.org/10.1080/02640414.2012.747690
Kilduff, L.P. ; Cook, C.J. ; Bennett, M. ; Crewther, Blair ; Bracken, Richard M ; Manning, J. / Right-left digit ratio (2D:4D) predicts free testosterone levels associated with a physical challenge. In: Journal of Sports Sciences. 2013 ; Vol. 31, No. 6. pp. 677-683.
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Kilduff, LP, Cook, CJ, Bennett, M, Crewther, B, Bracken, RM & Manning, J 2013, 'Right-left digit ratio (2D:4D) predicts free testosterone levels associated with a physical challenge', Journal of Sports Sciences, vol. 31, no. 6, pp. 677-683. https://doi.org/10.1080/02640414.2012.747690

Right-left digit ratio (2D:4D) predicts free testosterone levels associated with a physical challenge. / Kilduff, L.P.; Cook, C.J.; Bennett, M.; Crewther, Blair; Bracken, Richard M; Manning, J.

In: Journal of Sports Sciences, Vol. 31, No. 6, 2013, p. 677-683.

Research output: Contribution to journalArticle

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