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paoloferrari
08-18-2017, 07:41 AM
these are only examples but there is an infinite anthology about this matter(it is simple and not expensive to misure the ratio between the second and fourth finger)



Athletic ability and finger length linked?
https://www.sciencedaily.com/releases/2017/08/170817201218.htm

"Researchers have studied the correlation between athletic ability and finger length."

""Testosterone is the natural steroid hormone that enhances sport, athletic and fitness test performance. In general, people with smaller digit ratios are better athletes.

"Our study shows that boys with lower digit ratios have better handgrip strength, irrespective of their age or body size," Tomkinson said.

Because muscular strength is important for success in many youth sports and athletic events, the finding suggests that the digit ratio may predict performance in youth sports and athletic events requiring high strength. Muscular strength is also an important indicator of good health, and those with lower digit ratios probably have better general health and well-being, Tomkinson said."

Digit ratio (2D:4D) and performance in elite rugby players
https://www.ncbi.nlm.nih.gov/pubmed/20981610
"Abstract

The relative length of the second and fourth digits (2D:4D) is a putative marker for prenatal testosterone. Low 2D:4D has been reported to correlate with high performance in sport in general. Here, for the first time, we examine the relationship between 2D:4D and performance in elite rugby players. The 44 players (28 forwards, 16 backs) were drawn from the Ospreys Rugby Union Club and 44 age-matched controls. The measures of performance comprised age-adjusted number of international performances (caps) for Wales, a comparison of coaches' first-choice League team with others, and the number of tries scored by backs in club matches. Compared with controls, players were larger and had lower 2D:4D for the right and left hand. With regard to number of caps, players with low 2D:4D in their right hand and low right 2D:4D compared with their left (right - left 2D:4D difference) had high numbers of caps. First-choice players did not differ significantly from second-choice players in their 2D:4D but they did have a lower right - left 2D:4D difference than second-choice players. Low right 2D:4D and low right - left 2D:4D difference were significantly linked with large numbers of tries. We conclude that low right 2D:4D and low right - left 2D:4D difference are predictors of high rugby performance."

Digit ratio effects between expertise levels in american football players
https://www.researchgate.net/publication/287734901_Digit_ratio_effects_between_expertise_le vels_in_american_football_players

"Abstract
Previous research highlights the association between 2D:4D and performance in a host of elite sports. This study compared several variables related to the 2D:4D digit ratio among American football players of different skill levels. One-factorial analyses of variance between four groups were used. Participants came from four teams from different American Football leagues in Germany i.e., teams from the first (n = 17), second (n = 24), fourth (n = 18) and fifth (n = 20) leagues. Digit ratio was measured from digital images and t-test and analyses of variance were used to explore differences between teams and compared to normative data. The athlete sample had significantly lower 2D:4D ratio than the normative data. Further, there were significant differences for the left hand and the delta of the digit ratios of both hands but no effect for the right hand. These results add additional support for general effects for both digit ratio in elite sport; however, they also point to several areas of future research. © 2013 International Research Association for Talent Development and Excellence."

Elite Collegiate Tennis Athletes Have Lower 2D: 4D Ratios Than Those of Nonathlete Controls

http://journals.lww.com/nsca-jscr/Abstract/2015/03000/Elite_Collegiate_Tennis_Athletes_Have_Lower_2D__4D .34.aspx
"Abstract: Hsu, C-C, Su, B, Kan, N-W, Lai, S-L, Fong, T-H, Chi, C-P, Chang, C-C, and Hsu, M-C. Elite collegiate tennis athletes have lower 2D:4D ratios than those of nonathlete controls. J Strength Cond Res 29(3): 822–825, 2015—The ratio of the length of the second finger (index finger) to the fourth finger (ring finger) (2D:4D ratio) is a putative marker for prenatal hormones. Physiological research has suggested a low 2D:4D ratio correlates with high athletic ability. Athletes of specific sports (e.g., American football) have lower 2D:4D ratios than those of nonathletes, whereas athletes of some sports (e.g., rowing, gymnastics, and soccer) do not. This study investigated the 2D:4D ratios among collegiate tennis athletes, elite collegiate tennis athletes, and nonelite collegiate tennis athletes and compared them with nonathletes of both sexes. The participants included 43 elite collegiate tennis athletes (Level I intercollegiate athletes in Taiwan; 27 males and 16 females), 107 nonelite collegiate tennis athletes (Level II athletes; 55 males and 52 females), and 166 nonathlete college students (80 males and 86 females). The principle findings suggest that (a) regardless of sex, collegiate tennis athletes have lower 2D:4D values than those of nonathletes; (b) elite collegiate tennis athletes have lower 2D:4D values than those of nonathletes; (c) among females but not males, athletes and nonelite athletes have lower 2D:4D values than those of nonathletes; and (d) males have lower 2D:4D values than those of females."

Second to fourth digit ratio in elite musicians: Evidence for
musical ability as an honest signal of male fitness
http://www.kafyeda.co.il/vault/documents/Ratio_07.pdf
"Abstract
Prenatal testosterone may facilitate musical ability. The ratio of the length of the second and fourth
digit (2D:4D) is probably determined in utero and is negatively related to adult testosterone concentra-
tions and sperm numbers per ejaculate. Therefore, 2D:4D may be a marker for prenatal testosterone
levels. We tested the association between 2D:4D and musical ability by measuring the ratio in 70 mu-
sicians (54 men and 16 women) recruited from a British symphony orchestra. The men had signifi-
cantly lower 2D:4D ratios (indicating high testosterone) than controls (n5 86). The mean 2D:4D of
women did not differ significantly from controls (n 5 78). Rankings of musical ability within the or-
chestra were associated with male 2D:4D (high rank 5 low 2D:4D). Differences in 2D:4D ratio were
not found among instrument groups, suggesting that 2D:4D was not related to mechanical advantages
in playing particular intruments. Concert audiences showed evidence of a female-biased sex ratio in
seats close to the orchestra. This preliminary study supports the thesis that music is a sexually selected
trait in men that indicates fertilizing capacity and perhaps good genes. However, the association be-
tween low 2D:4D ratio and orchestra membership and high status within the orchestra may result from
testosterone-mediated competitive ability. Further tests of the association between 2D:4D and musical
ability per se are necessary"

"Our sample of elite male musicians had lower 2D:4D ratios than the population norms.
There was evidence of significant relationships between 2D:4D ratio and ranking of male
musicians within the orchestra. Low 2D:4D was associated with high rank"

The Second to Fourth Digit Ratio in Elite and Non-Elite Greco-Roman Wrestlers
http://www.johk.pl/files/1078-2017-59-0009.pdf

" A low second-to-fourth digit ratio (2D:4D) has been reported to correlate with high performance and athletic potential of an individual in sport. It has been suggested that 2D:4D is a relatively weak predictor of strength and a stronger predictor of efficiency in aerobic exercise. Comparing extreme groups on a continuum of sports performance requiring high power (physical strength) output would be helpful to resolve this issue. Therefore, the purpose of the present study was to compare the 2D:4D ratio of world-class elite Greco-Roman wrestlers (n = 10) taking part in Olympic fitness camps in 2013 with the 2D:4D ratio of non-elite collegiate wrestlers (n = 20), and age-matched sedentary males (n = 40). The 2D:4D ratios of elite wrestlers were lower compared to non-elite athletes "

and guess who are in europe and, pheraps, in the world ,the most masculinized men?finns....:
The 2nd:4th digit ratio, sexual dimorphism, population differences, and reproductive success: Evidence for sexually antagonistic genes?
https://www.researchgate.net/publication/12488687_The_2nd4th_digit_ratio_sexual_dimorphism_ population_differences_and_reproductive_success_Ev idence_for_sexually_antagonistic_genes

anglesqueville
08-18-2017, 05:05 PM
Manning has hit a motherlode with the 2d:4d ratio: penis length for the wide public ( tone of texts, including some very serious academic ones), athletic ability for the sporting public, music ( that one is new to me :biggrin1: ), fertility of course, and in fact anything than may be related with prenatal testosterone.

paoloferrari
08-18-2017, 05:47 PM
yes,music and digit ratio sounds new me too, but now i understand why in my twenties i was so envious of musicists ,always full of girls, althought their pseudo-rock was unlistenable and their discourses were even worse!:blah:


finns are subjected to tons of prenatal testosterone(also jamaican,in fact natural selection was very harsh for them):
The 2nd:4th digit ratio, sexual dimorphism, population differences, and reproductive success: Evidence for sexually antagonistic genes?
https://www.researchgate.net/publication/12488687_The_2nd4th_digit_ratio_sexual_dimorphism_ population_differences_and_reproductive_success_Ev idence_for_sexually_antagonistic_genes

"Abstract
The ratio between the length of the 2nd and 4th digit (2D:4D) is sexually dimorphic, with mean male 2D:4D lower than mean female 2D:4D. It recently was suggested that 2D:4D is negatively correlated with prenatal testosterone and positively correlated with prenatal estrogen. It is argued that high prenatal testosterone and low estrogen (indicated by low 2D:4D) favors the male fetus and low prenatal testosterone and high estrogen (indicated by high 2D:4D) favors the female fetus. The patterns of expression of 2D:4D are interpreted in terms of sexually antagonistic genes.We report data on the following. (a) reproductive success and 2D:4D from England, Germany, Spain, Hungary (ethnic Hungarians and Gypsy subjects), Poland, and Jamaica (women only). Significant negative associations were found between 2D:4D in men and reproductive success in the English and Spanish samples and significant positive relationships between 2D:4D in women and reproductive success in the English, German, and Hungarian samples. The English sample also showed that married women had higher 2D:4D ratios than unmarried women, suggesting male choice for a correlate of high ratio in women, and that a female 2D:4D ratio greater than male 2D:4D predicted high reproductive success within couples. Comparison of 2D:4D ratios of 62 father:child pairs gave a significant positive relationship. This suggested that genes inherited from the father had some influence on the formation of the 2D:4D ratio. Waist:hip ratio in a sample of English and Jamaican women was negatively related to 2D:4D. (b) Sex and population differences in mean 2D:4D in samples from England, Germany, Spain, Hungary (including ethnic Hungarians and Gypsy subjects), Poland, Jamaica, Finland, and South Africa (a Zulu sample). Significant sex and population differences in mean 2D:4D were apparent."