Relative Age Effect in Olympic Karate: Evidence from Tokyo 2020

Area of Science:

• Sports Science
• Sports Psychology
• Talent Identification

Background:

• The Relative Age Effect (RAE) is a known phenomenon in sports, conferring advantages to athletes born earlier in the selection year.
• Evidence for RAE in elite karate, especially at the Olympic level, is limited.
• This study investigates RAE in male and female karatekas at the Tokyo 2020 Olympics across kata and kumite disciplines.

Purpose of the Study:

• To determine if RAE exists among karate athletes competing in the Tokyo 2020 Olympics.
• To analyze RAE differences between genders and competitive disciplines (kata vs. kumite).
• To assess the impact of relative age on medal attainment in elite karate.

Main Methods:

• Data from 81 karate athletes (42 males, 39 females) from the Tokyo 2020 Olympics were analyzed.
• Birthdates were categorized into quartiles (Q1-Q4) and semesters (S1-S2).
• Chi-squared tests, odds ratios, and binary logistic regression were employed to assess RAE and its relation to performance.

Main Results:

• A significant deviation from uniform birthdate distribution was observed overall (p=0.020), with more athletes born in Q1 (38%) than Q4 (19%).
• RAE was pronounced in kumite (p<0.001) and among female athletes (p=0.019), but not in kata or males.
• Relative age (semester of birth) did not significantly predict medal success (p=0.125).

Conclusions:

• This research presents the first evidence of RAE in Olympic karate, notably in kumite and among female competitors.
• Despite the presence of RAE in selection, birthdate advantage does not appear to influence medal outcomes at the Olympic level.
• Technical and tactical skills likely supersede relative age as performance determinants in elite karate.