중․고등학교 남자 유도선수들의 검지/약지 비율(2D:4D ratio)과 체력과의 상관관계
Relationship between digit ratio (2D:4D) and physical fitness in middle and highschool Judoka
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본 연구는 출생 전 테스토스테론의 노출지표인 검지(index finger, 2D)와 약지(ring finger, 4D)의 길이비율(2D:4D ratio)이 유도선수와 일반학생사이에 어떠한 차이가 있는지를 규명하고, 각 집단 내에서 2D:4D ratio와 근력(악력, 배근력), 근파워, 근지구력과의 상관을 알아보는 것이다. 중․고등학교에 재학 중인 남자 유도선수 48명과 남자 일반학생 54명을 대상으로 오른손과 왼손의 2D:4D비율을 측정하였으며, 악력, 배근력, 서전트 점프, 철봉 매달리기를 측정하여 다음과 같은 결론을 얻었다. 유도선수 집단이 왼손과 오른손 그리고 양손의 평균 2D:4D ratio에서 모두 일반인 집단에 비해서 통계적으로 유의하게(p<.01) 낮은 2D:4D ratio을 가지고 있었다. 또한, 2D:4D비율과 체력과의 상관관계를 보면, 유도선수 집단과 일반학생집단 모두에서 철봉 매달리기와 서전트 점프를 제외하고 악력, 배근력, 체중당 악력, 체중당 배근력에서 부적으로 유의한(p<.001, p<.05)상관을 나타냈다. 이상의 결과를 종합해 볼 때 일반학생에 비해 유도선수집단이 더 낮은 2D:4D비율을 가지고 있었으며 2D:4D비율이 낮을수록 운동수행능력이 높다는 것을 확인할 수 있었다. 차후에는 보다 대단위로 운동종목별 2D:4D ratio을 측정하고, 종목별 전문체력과 2D:4D ratio와의 상관관계를 밝히는 연구가 이루어진다면, 비교적 간단한 방법으로 영재 선수를 선발하는데 유용한 지표가 될 수 있을 것으로 생각된다.
Abstract
The aim of this study was for second and fourth digit(2D:4D) ratio, a marker for prenatal testosterone exposure, to find out what kind of difference there is with to groups (judoka, a general student), as well as to figure out the relationship between digit ratio, grip strength, back muscular strength, muscle power, muscular endurance. Research subject were 102 middle school and high school students(54 general male, 48 athletes male ). We measured their ratio of the 2nd and 4th left and right fingers. Here we show following conclusions measuring grip strength, back muscular strength, standing jump and so on. It has shown there was lower digit ratio in female than in male in terms of both right and left hand. We have also found that judo athletes groups had lower digit ratio than general groups(p<.000, p<.003). In terms of correlation between (2D:4D)ratio and performance in various athletic disciplines, we have found that there was meaningful correlation in grip strength, back muscular strength, handgrip strength per body weight, back muscular strength per body weight, and standing jump except for hanging down from chin-up bar. In conclusion, regardless of athletes groups have lower (2D:4D)ratio rather than general groups and we could verify that the lower the ratio is, the higher performance in various athletic disciplines is.
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