Basketbolcularda 2D:4D parmak oranı ve şut beceri performansı
Year 2022,
Volume: 5 Issue: 3, 537 - 549, 28.09.2022
Levent Ceylan
,
Hamza Küçük
,
Tülay Ceylan
,
Murat Eliöz
Abstract
Bu çalışmanın amacı basketbolcularda 2d:4d parmak oranının atış performansına etkisini incelemektir. Çalışmaya 15,04±1,69 yaşında 3 yıldır aktif olarak basketbol oynayan 30 erkek ve 30 kadın basketbolcu katılmıştır. Katılımcıların basketbol şut beceri performansını belirlemek için 0 ile 5 arası puanlayarak serbest atış çizgisinden 5 kez atış yapılması istenmiştir. Parmak uzunluğunu belirlemek için Milimetre (mm) cinsinden 0.01 mm hassasiyetle 0-150 mm (USA, Cocraft) Vernier marka dijital kumpas kullanılarak ikinci parmak (2D) ve dördüncü parmak (4D) katılımcıların her iki elinden ölçüm yapılmıştır. Ayrıca katılımcıların dayanıklılığını ölçmek için 20 Metre Mekik Koşu Testi uygulanmıştır. İstatistiki analiz için Bağımsız örneklem T-Testi ve Pearson korelasyon testi kullanılmıştır. Katılımcıların atış parametrelerinde, Shuttle Run Testte ve diğer 2D ve 4D parametrelerinde anlamlı fark bulunmamıştır (p>0,05). Katılımcıların 20 Metre Mekik Koşu Testi ile sol el 2d:4d değişkenleri arasında ters ilişki vardır (p<0,05). Katılımcıların toplam şut performansı ile 20 Metre Mekik Koşu Testi ve 2d:4d parmak oranı parametrelerinde anlamlı ilişki yoktur (p>0,05). Sonuç olarak adölesan erkek ve kız basketbolcularda 2D: 4D ile aerobik performans ve şut arasında bir etkinin olmadığı bulunmuştur. Bu sonuç örneklem grubunun yaşından, antrenman seviyesinden ve heterojenliğinden kaynaklanabilir.
References
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- Baker, J., Kungl, A. M., Pabst, J., Strauss, B., Buesch, D., & Schorer, J. (2013). Your fate is in your hands? Handedness, digit ratio (2D: 4D), and selection to a national talent development system. Laterality: Asymmetries of Body, Brain and Cognition, 18(6), 710-718.doi:10.1080/1357650X.2012.755992
- Barnard, C. (2008). National junior Program: Fitness testing Protocols. Williamstown, VIC, AUS: Badminton Aust.
- Bennett, M., Manning, J. T., Cook, C. J., & Kilduff, L. P. (2010). Digit ratio (2D: 4D) and performance in elite rugby players. Journal of sports sciences, 28(13), 1415-1421. doi: 10.1080/02640414.2010.510143
- Button, C., Macleod, M., Sanders, R., & Coleman, S. (2003). Examining movement variability in the basketball free-throw action at different skill levels. Research quarterly for exercise and sport, 74(3), 257-269.
- Castagna, C., Chaouachi, A., Rampinini, E., Chamari, K., & Impellizzeri, F. (2009). Aerobic and explosive power performance of elite Italian regional-level basketball players. Journal of Strength and Conditioning Research, 23, 1982–1987.
- Çelik, A., Aksu, F., Tunar, M., Daşdan Ada E.N., Topaçoğlu, H. (2010). Master atletlerin fiziksel performans düzeylerinin eldeki parmak oranlarıyla ilişkisi. Dokuz Eylül Üniversitesi Tıp Fakültesi Dergisi, 24(1), 5-10.
- Coates, J. M., Gurnell, M., & Rustichini, A. (2009). Second-to-fourth digit ratio predicts success among high-frequency financial traders. Proceedings of the national academy of sciences, 106(2), 623-628.
- Dougherty, K. A., Baker, L. B., Chow, M., & Kenney, W. L. (2006). Two percent dehydration impairs and six percent carbohydrate drink improves boys basketball skills. Medicine and science in sports and exercise, 38(9), 1650-1658.
- Dyer, M., Short, S. E., Short, M., Manning, J. T., & Tomkinson, G. R. (2018). Relationships between the second to fourth digit ratio (2D:4D) and game-related statistics in semi-professional female basketball players. American Journal of Human Biology, 30, e23070
- Eghbali, E. (2016). The relationship between digit ratio (2D: 4D) and phy sical fitness in boys 7 to 13 years. Physical Activity Review, 4, 154-162.
- Eklund, E., Ekström, L., Thörngren, J.O, Ericsson, M., Berglund, B., Hirschberg, A.L. (2020) Digit Ratio (2D:4D) and Physical Performance in Female Olympic Athletes. Front. Endocrinol. 11:292. doi: 10.3389/fendo.2020.00292
- Eler, N., Vurgun, H., & Eler, S. (2020). Hentbolda 2D-4D Parmak Oranı ile Sürat ve Linear Yön Değiştirme ve VO 2maks Performansları Arasındaki İlişki. Turkiye Klinikleri Journal of Sports Sciences, 12(2), 115-119. doi: 10.5336/sportsci.2019-72371
- Ellis L, Nyborg H (1992). Racial/Ethnic Variations in Male Testesterone Levels, A Probable Contributor to Group Differences in Health. Steroids, 57:72-75.
- Eraslan, A., Alvurdu, S. & Bıyıklı, T. (2020). Fitness ve Wellness Eğitmenliği: Kavramsal Bir Yaklaşım . Gazi Beden Eğitimi ve Spor Bilimleri Dergisi , 25 (2) , 127-139 .
- Fink, B., Thanzami, V., Seydel, H., & Manning, J. T. (2006). Digit ratio and hand grip strength in German and Mizos men: Cross-cultural evidence for an organizing effect of prenatal testosterone on strength. American Journal of Human Biology, 18, 776–782.
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- Galis, F., Ten Broek, C., Van Dongen, S., & Wijnaendts, L. C. (2010). Sexual dimorphism in the prenatal digit ratio (2D: 4D). Archives of sexual behavior, 39(1), 57-62.
Geschwind, N., & Galaburda, A. (1987). Cerebral lateralization. Cambridge, MA: MIT Press.
- Giffin, N. A., Kennedy, R. M., Jones, M. E., & Barber, C. A. (2012). Varsity athletes have lower 2D: 4D ratios than other university students. Journal of sports sciences, 30(2), 135-138. doi: 10.1080/02640414.2011.630744
- Hill, R., Simpson, B., Manning, J., & Kilduff, L. (2012). Right–left digit ratio (2D: 4D) and maximal oxygen uptake. Journal of sports sciences, 30(2), 129-134.
- Hönekopp J, J TM, Muller C. (2006). Digit ratio (2D:4D) and physical fitness in males and females: evidence for effects of prenatal androgens on sexually selected traits. Horm Behav. 49:545–9. doi: 10.1016/j.yhbeh.2005. 11.006
- Hönekopp, J., & Schuster, M. (2010). A meta-analysis on 2D: 4D and athletic prowess: Substantial relationships but neither hand out-predicts the other. Personality and Individual Differences, 48(1), 4-10. doi: 10.1016/j.paid.2009.08.009
- Hsu, C.C., Su, B., Kan, N.W., Lai, S.L., Fong, T.H., Chi, C.P., et al. (2015). Elite collegiate tennis athletes have lower 2D: 4D ratios than those of nonathlete controls. The Journal of Strength & Conditioning Research, 29(3), 822-825. doi: 10.1519/JSC.0000000000000681
- Hull, M.J., Schranz, N.K., Manning, J.T., Tomkinson, G.R. (2015). Relationships between digit ratio (2D:4D) and female competitive rowing performance. Am J Hum Biol. 27:157–63. doi: 10.1002/ajhb.22627
- Keith‐Barnett, N., & Campbell, A. (2007). Sporting achievement: what is the contribution of digit ratio?. Journal of personality, 75(4), 663-678. doi: 10.1111/j.1467-6494.2007.00452.x
- Klapprodt, K. L., Fitzgerald, J. S., Short, S. E., Manning, J. T., & Tomkinson, G. R. (2018). Relationships between the digit ratio (2D: 4D) and game‐related statistics in professional and semi‐professional male basketball players. American Journal of Human Biology, 30(6), e23182.
- Krause JV, Meyer D, Meyer J. Basketball skill and drills. Human Kinetics; 1999.
- Manning, J. T., Scutt, D., Wilson, J., & Lewis-Jones, D. I. (1998). The ratio of 2nd to 4th digit length: a predictor of sperm numbers and concentrations of testosterone, luteinizing hormone and oestrogen. Human Reproduction (Oxford, England), 13(11), 3000-3004.
- Manning, J. T., & Taylor, R. P. (2001). Second to fourth digit ratio and male ability in sport: implications for sexual selection in humans. Evolution and human behavior, 22(1), 61-69. doi: 10.1016/S1090-5138(00)00063-5
- Manning, J. T. (a). (2002). Digit ratio: A pointer to fertility, behavior and health. New Jersey: Rutgers University Press
- Manning, J. T. (b) (2002). The ratio of 2nd to 4th digit length and performance in skiing. Journal of sports medicine and physical fitness, 42(4), 446.
- Manning, J. T., Churchill, A. J., & Peters, M. (a). (2007). The effects of sex, ethnicity, and sexual orientation on self measured digit ratio (2D: 4D). Archives of Sexual Behavior, 36(2), 223–233.
- Manning, J. T., Morris, L., & Caswell, N. (b). (2007). Endurance running and digit ratio (2D: 4D): implications for fetal testosterone effects on running speed and vascular health. American Journal of Human Biology: The Official Journal of the Human Biology Association, 19(3), 416-421. doi: 10.1002/ajhb.20603
- Manning, J. T., & Hill, M. (2009). Digit ratio (2D:4D) and sprinting speed in boys. American Journal of Human Biology, 21, 210–213.
- McGill, S. M., Andersen, J. T., & Horne, A. D. (2012). Predicting performance and injury resilience from movement quality and fitness scores in a basketball team over 2 years. Journal of Strength and Conditioning Research, 26, 1731–1739.
- Miyaguchi, S., Inukai, Y., Hashimoto, I., Otsuru, N., & Onishi, H. (2022). Sleep affects the motor memory of basketball shooting skills in young amateurs. Journal of Clinical Neuroscience, 96, 187-193.
- Paul, S. N., Kato, B. S., Hunkin, J. L., Vivekanandan, S., & Spector, T. D. (2006). The big finger: the second to fourth digit ratio is a predictor of sporting ability in women. British journal of sports medicine, 40(12), 981-983. doi: 10.1136/bjsm.2006.027193
- Peeters, M. W., Van Aken, K., & Claessens, A. L. (2013). The left hand second to fourth digit ratio (2D: 4D) is not related to any physical fitness component in adolescent girls. PloS one, 8(4),1-7. e59766. doi: 10.1371/journal.pone.0059766
- Perkos, S., Theodorakis, Y., & Chroni, S. (2002). Enhancing performance and skill acquisition in novice basketball players with instructional self-talk. The Sport Psychologist, 16(4), 368-383.
- Pokrywka, L., Rachoń, D., Suchecka‐Rachoń, K., & Bitel, L. (2005). The second to fourth digit ratio in elite and non‐elite female athletes. American Journal of Human Biology, 17(6), 796-800. doi: 10.1002/ajhb.20449
- Ranson, R., Stratton, G., & Taylor, S. R. (2015). Digit ratio (2D: 4D) and physical fitness (Eurofit test battery) in school children. Early human development, 91(5), 327-331
- Sariakçali, B., Ceylan, L., Ceviker, A. (2022). Evaluatıon of head trauma on pıtuıtary functıon ın professıonal soccer players. Acta Medica Mediterranea, 38(2), 945-950. doi: 10.19193/0393- 6384_2022_2_145
- Tomkinson, J. M., & Tomkinson, G. R. (2017). Digit ratio (2D:4D) and muscular strength in adolescent boys. Early Human Development, 113, 7–9.
- Van Honk, J., Schutter, D. J., Bos, P. A., Kruijt, A. W., Lentjes, E. G., & Baron-Cohen, S. (2011). Testosterone administration impairs cognitive empathy in women depending on second-to-fourth digit ratio. Proceedings of the National Academy of Sciences, 108(8), 3448-3452.
- Voracek, M., Reimer, B., & Dressler, S. G. (2010). Digit ratio (2D: 4D) predicts sporting success among female fencers independent from physical, experience, and personality factors. Scandinavian journal of medicine & science in sports, 20(6), 853-860. doi: 10.1111/j.1600-0838.2009.01031.x
- Wang, C. H., Chang, C. C., Liang, Y. M., Shih, C. M., Chiu, W. S., Tseng, P., ... Juan, C. H. (2013). Open vs. closed skill sports and the modulation of inhibitory control. PloS One, 8(2), e55773.
- Zhen, L., Wang, L., & Hao, Z. (2015). A biomechanical analysis of basketball shooting. International Journal of Simulation Systems, Science & Technology, 16, 1-1. doi: 10.5013/IJSSST.a.16.3B.01
The 2nd:4th digit ratio and shooting skill performance in Basketball Players
Year 2022,
Volume: 5 Issue: 3, 537 - 549, 28.09.2022
Levent Ceylan
,
Hamza Küçük
,
Tülay Ceylan
,
Murat Eliöz
Abstract
Abstract
The aim of this study was to investigate the effect of 2d:4d digit ratio on shooting performance in basketball players. 30 male and 30 female basketball players who have been actively playing basketball for 3 years at the age of 15±04.1.69 participated in the study. Participants were asked to score 5 shots from the free throw line by scoring between 0 and 5 to determine their basketball shooting skill performance. To determine finger length, the second finger (2D) and fourth finger (4D) (Figure 3) were measured using a 0-150 mm (USA, Cocraft) Vernier digital caliper with an accuracy of 0.01 mm in millimeters (mm). In addition, the 20 Meter Shuttle Running Test was applied to measure the endurance of the participants. Independent sample T-Test and Pearson correlation test were used for statistical analysis. There was no significant difference in the participants' shot parameters, Shuttle Run Test and other 2D and 4D parameters (p>0.05). There was a negative correlation between the 20 Meter Shuttle Running Test and the left hand 2d:4d variables of the participants (p<0.05). There was no significant relationship between the total shot performance of the participants and the parameters of the 20 Meter Shuttle Running Test and 2d:4d digit ratio (p>0.05). It was found that there was no effect between 2D: 4D and aerobic performance and shooting in adolescent male and female basketball players. This result may be due to the age, training level and heterogeneity of the sample group.
References
- Acar, H., & Eler, N. (2018). The Relationship of Digit Ratio (2D: 4D) with Cerebral Lateralization and Grip Strength in Elite Swimmers. Journal of education and training studies, 6(4), 84-89. doi: 10.11114/jets.v6i4.3040
- Baker, J., Kungl, A. M., Pabst, J., Strauss, B., Buesch, D., & Schorer, J. (2013). Your fate is in your hands? Handedness, digit ratio (2D: 4D), and selection to a national talent development system. Laterality: Asymmetries of Body, Brain and Cognition, 18(6), 710-718.doi:10.1080/1357650X.2012.755992
- Barnard, C. (2008). National junior Program: Fitness testing Protocols. Williamstown, VIC, AUS: Badminton Aust.
- Bennett, M., Manning, J. T., Cook, C. J., & Kilduff, L. P. (2010). Digit ratio (2D: 4D) and performance in elite rugby players. Journal of sports sciences, 28(13), 1415-1421. doi: 10.1080/02640414.2010.510143
- Button, C., Macleod, M., Sanders, R., & Coleman, S. (2003). Examining movement variability in the basketball free-throw action at different skill levels. Research quarterly for exercise and sport, 74(3), 257-269.
- Castagna, C., Chaouachi, A., Rampinini, E., Chamari, K., & Impellizzeri, F. (2009). Aerobic and explosive power performance of elite Italian regional-level basketball players. Journal of Strength and Conditioning Research, 23, 1982–1987.
- Çelik, A., Aksu, F., Tunar, M., Daşdan Ada E.N., Topaçoğlu, H. (2010). Master atletlerin fiziksel performans düzeylerinin eldeki parmak oranlarıyla ilişkisi. Dokuz Eylül Üniversitesi Tıp Fakültesi Dergisi, 24(1), 5-10.
- Coates, J. M., Gurnell, M., & Rustichini, A. (2009). Second-to-fourth digit ratio predicts success among high-frequency financial traders. Proceedings of the national academy of sciences, 106(2), 623-628.
- Dougherty, K. A., Baker, L. B., Chow, M., & Kenney, W. L. (2006). Two percent dehydration impairs and six percent carbohydrate drink improves boys basketball skills. Medicine and science in sports and exercise, 38(9), 1650-1658.
- Dyer, M., Short, S. E., Short, M., Manning, J. T., & Tomkinson, G. R. (2018). Relationships between the second to fourth digit ratio (2D:4D) and game-related statistics in semi-professional female basketball players. American Journal of Human Biology, 30, e23070
- Eghbali, E. (2016). The relationship between digit ratio (2D: 4D) and phy sical fitness in boys 7 to 13 years. Physical Activity Review, 4, 154-162.
- Eklund, E., Ekström, L., Thörngren, J.O, Ericsson, M., Berglund, B., Hirschberg, A.L. (2020) Digit Ratio (2D:4D) and Physical Performance in Female Olympic Athletes. Front. Endocrinol. 11:292. doi: 10.3389/fendo.2020.00292
- Eler, N., Vurgun, H., & Eler, S. (2020). Hentbolda 2D-4D Parmak Oranı ile Sürat ve Linear Yön Değiştirme ve VO 2maks Performansları Arasındaki İlişki. Turkiye Klinikleri Journal of Sports Sciences, 12(2), 115-119. doi: 10.5336/sportsci.2019-72371
- Ellis L, Nyborg H (1992). Racial/Ethnic Variations in Male Testesterone Levels, A Probable Contributor to Group Differences in Health. Steroids, 57:72-75.
- Eraslan, A., Alvurdu, S. & Bıyıklı, T. (2020). Fitness ve Wellness Eğitmenliği: Kavramsal Bir Yaklaşım . Gazi Beden Eğitimi ve Spor Bilimleri Dergisi , 25 (2) , 127-139 .
- Fink, B., Thanzami, V., Seydel, H., & Manning, J. T. (2006). Digit ratio and hand grip strength in German and Mizos men: Cross-cultural evidence for an organizing effect of prenatal testosterone on strength. American Journal of Human Biology, 18, 776–782.
- Frick NA, Hull MJ, Manning JT, Tomkinson GR. Relationships between digit ratio (2D:4D) and basketball performance in Australian men. Am J Hum Biol. 2017;29:e22937. https://doi.org/ 10.1002/ajhb.2293
- Galis, F., Ten Broek, C., Van Dongen, S., & Wijnaendts, L. C. (2010). Sexual dimorphism in the prenatal digit ratio (2D: 4D). Archives of sexual behavior, 39(1), 57-62.
Geschwind, N., & Galaburda, A. (1987). Cerebral lateralization. Cambridge, MA: MIT Press.
- Giffin, N. A., Kennedy, R. M., Jones, M. E., & Barber, C. A. (2012). Varsity athletes have lower 2D: 4D ratios than other university students. Journal of sports sciences, 30(2), 135-138. doi: 10.1080/02640414.2011.630744
- Hill, R., Simpson, B., Manning, J., & Kilduff, L. (2012). Right–left digit ratio (2D: 4D) and maximal oxygen uptake. Journal of sports sciences, 30(2), 129-134.
- Hönekopp J, J TM, Muller C. (2006). Digit ratio (2D:4D) and physical fitness in males and females: evidence for effects of prenatal androgens on sexually selected traits. Horm Behav. 49:545–9. doi: 10.1016/j.yhbeh.2005. 11.006
- Hönekopp, J., & Schuster, M. (2010). A meta-analysis on 2D: 4D and athletic prowess: Substantial relationships but neither hand out-predicts the other. Personality and Individual Differences, 48(1), 4-10. doi: 10.1016/j.paid.2009.08.009
- Hsu, C.C., Su, B., Kan, N.W., Lai, S.L., Fong, T.H., Chi, C.P., et al. (2015). Elite collegiate tennis athletes have lower 2D: 4D ratios than those of nonathlete controls. The Journal of Strength & Conditioning Research, 29(3), 822-825. doi: 10.1519/JSC.0000000000000681
- Hull, M.J., Schranz, N.K., Manning, J.T., Tomkinson, G.R. (2015). Relationships between digit ratio (2D:4D) and female competitive rowing performance. Am J Hum Biol. 27:157–63. doi: 10.1002/ajhb.22627
- Keith‐Barnett, N., & Campbell, A. (2007). Sporting achievement: what is the contribution of digit ratio?. Journal of personality, 75(4), 663-678. doi: 10.1111/j.1467-6494.2007.00452.x
- Klapprodt, K. L., Fitzgerald, J. S., Short, S. E., Manning, J. T., & Tomkinson, G. R. (2018). Relationships between the digit ratio (2D: 4D) and game‐related statistics in professional and semi‐professional male basketball players. American Journal of Human Biology, 30(6), e23182.
- Krause JV, Meyer D, Meyer J. Basketball skill and drills. Human Kinetics; 1999.
- Manning, J. T., Scutt, D., Wilson, J., & Lewis-Jones, D. I. (1998). The ratio of 2nd to 4th digit length: a predictor of sperm numbers and concentrations of testosterone, luteinizing hormone and oestrogen. Human Reproduction (Oxford, England), 13(11), 3000-3004.
- Manning, J. T., & Taylor, R. P. (2001). Second to fourth digit ratio and male ability in sport: implications for sexual selection in humans. Evolution and human behavior, 22(1), 61-69. doi: 10.1016/S1090-5138(00)00063-5
- Manning, J. T. (a). (2002). Digit ratio: A pointer to fertility, behavior and health. New Jersey: Rutgers University Press
- Manning, J. T. (b) (2002). The ratio of 2nd to 4th digit length and performance in skiing. Journal of sports medicine and physical fitness, 42(4), 446.
- Manning, J. T., Churchill, A. J., & Peters, M. (a). (2007). The effects of sex, ethnicity, and sexual orientation on self measured digit ratio (2D: 4D). Archives of Sexual Behavior, 36(2), 223–233.
- Manning, J. T., Morris, L., & Caswell, N. (b). (2007). Endurance running and digit ratio (2D: 4D): implications for fetal testosterone effects on running speed and vascular health. American Journal of Human Biology: The Official Journal of the Human Biology Association, 19(3), 416-421. doi: 10.1002/ajhb.20603
- Manning, J. T., & Hill, M. (2009). Digit ratio (2D:4D) and sprinting speed in boys. American Journal of Human Biology, 21, 210–213.
- McGill, S. M., Andersen, J. T., & Horne, A. D. (2012). Predicting performance and injury resilience from movement quality and fitness scores in a basketball team over 2 years. Journal of Strength and Conditioning Research, 26, 1731–1739.
- Miyaguchi, S., Inukai, Y., Hashimoto, I., Otsuru, N., & Onishi, H. (2022). Sleep affects the motor memory of basketball shooting skills in young amateurs. Journal of Clinical Neuroscience, 96, 187-193.
- Paul, S. N., Kato, B. S., Hunkin, J. L., Vivekanandan, S., & Spector, T. D. (2006). The big finger: the second to fourth digit ratio is a predictor of sporting ability in women. British journal of sports medicine, 40(12), 981-983. doi: 10.1136/bjsm.2006.027193
- Peeters, M. W., Van Aken, K., & Claessens, A. L. (2013). The left hand second to fourth digit ratio (2D: 4D) is not related to any physical fitness component in adolescent girls. PloS one, 8(4),1-7. e59766. doi: 10.1371/journal.pone.0059766
- Perkos, S., Theodorakis, Y., & Chroni, S. (2002). Enhancing performance and skill acquisition in novice basketball players with instructional self-talk. The Sport Psychologist, 16(4), 368-383.
- Pokrywka, L., Rachoń, D., Suchecka‐Rachoń, K., & Bitel, L. (2005). The second to fourth digit ratio in elite and non‐elite female athletes. American Journal of Human Biology, 17(6), 796-800. doi: 10.1002/ajhb.20449
- Ranson, R., Stratton, G., & Taylor, S. R. (2015). Digit ratio (2D: 4D) and physical fitness (Eurofit test battery) in school children. Early human development, 91(5), 327-331
- Sariakçali, B., Ceylan, L., Ceviker, A. (2022). Evaluatıon of head trauma on pıtuıtary functıon ın professıonal soccer players. Acta Medica Mediterranea, 38(2), 945-950. doi: 10.19193/0393- 6384_2022_2_145
- Tomkinson, J. M., & Tomkinson, G. R. (2017). Digit ratio (2D:4D) and muscular strength in adolescent boys. Early Human Development, 113, 7–9.
- Van Honk, J., Schutter, D. J., Bos, P. A., Kruijt, A. W., Lentjes, E. G., & Baron-Cohen, S. (2011). Testosterone administration impairs cognitive empathy in women depending on second-to-fourth digit ratio. Proceedings of the National Academy of Sciences, 108(8), 3448-3452.
- Voracek, M., Reimer, B., & Dressler, S. G. (2010). Digit ratio (2D: 4D) predicts sporting success among female fencers independent from physical, experience, and personality factors. Scandinavian journal of medicine & science in sports, 20(6), 853-860. doi: 10.1111/j.1600-0838.2009.01031.x
- Wang, C. H., Chang, C. C., Liang, Y. M., Shih, C. M., Chiu, W. S., Tseng, P., ... Juan, C. H. (2013). Open vs. closed skill sports and the modulation of inhibitory control. PloS One, 8(2), e55773.
- Zhen, L., Wang, L., & Hao, Z. (2015). A biomechanical analysis of basketball shooting. International Journal of Simulation Systems, Science & Technology, 16, 1-1. doi: 10.5013/IJSSST.a.16.3B.01