scholarly journals Efecto de la edad relativa en la élite del balonmano femenino español y su relación con aspectos antropométricos, de rendimiento y velocidad de lanzamiento.

2021 ◽  
Vol 21 (2) ◽  
pp. 213-226
Author(s):  
Carmen Ferragut ◽  
Helena Vila ◽  
Juan J. Fernández ◽  
Miguel Ángel Saavedra García
Keyword(s):  
Physical Fitness ◽  
Age Effect ◽  
Chi Square ◽  
Squat Jump ◽  
National Team ◽  
Relative Age ◽  
Relative Age Effect ◽  
Chi Square Test ◽  
The Subject

El efecto de la edad relativa es un aspecto de relevancia en el deporte en general y en balonmano en particular. Ha sido objeto de gran cantidad de estudios centrados mayoritariamente en deporte masculino. Los estudios sobre la edad relativa en balonmano femenino, no son tan numerosos, y no aclaran el efecto de la misma en esta modalidad deportiva. Por ello, el objetivo de este estudio fue determinar la existencia del efecto de la edad relativa en jugadoras de élite de balonmano, así como valorar dicho efecto en función de variables antropométricas, de condición física y técnico tácticas (velocidad de lanzamiento). Han sido evaluadas 136 jugadoras de balonmano de los ocho primeros equipos de división de honor. Se ha encontrado un efecto de la edad relativa (con la prueba de chi-cuadrado) en las jugadoras de balonmano, sustentado por aquellas que formaron parte de los equipos nacionales. No se encontraron efectos de la edad relativa en las variables antropométricas, ni en las velocidades de lanzamiento con y sin interacción. La lateralidad y el Squat Jump (SJ), presentaron un efecto de la edad relativa. El efecto de la edad relativa es importante para llegar a la selección, pero para jugar en la máxima categoría el efecto de la edad relativa no es tan importante. Son necesarios más estudios sobre el efecto de la edad relativa en el balonmano femenino. Relative age effect is an aspect of relevance in sport in general and in handball in particular. It has been the subject of a great number of studies focused largely on men's sport. Studies on relative age in female handball are not so numerous, and do not clarify the effect of female handball on this sport. Therefore, the aim of this study was to establish the effect of relative age on élite handball players, as well as to assess this effect based on anthropometric variables, physical fitness and technical and tactical skills (throwing speed). 136 handball players from the first eight honour division teams have been assessed. A relative age effect has been found (with chi-square test) in the handball players supported by those included in national teams. No effects of relative age were found on anthropometric variables, nor on throwing speed with and without interaction. Laterality and Squat Juam (SJ) presented a relative age effect. Relative age is important to reach the national team, but to play in the highest category the effect of relative age seems to lose weight Further studies on the effect of relative age on women's handball are needed. O efeito da idade relativa é um aspecto de relevância no desporto em geral e no andebol em particular. Tem sido objeto de elevado número de estudos centrados em grande parte no andebol masculino. Os estudos sobre a idade relativa no andebol feminino, não são tão numerosos, e não clarejam o efeito da mesma nesta modalidade esportiva. Por isso, o objetivo deste estudo foi determinar a existência do efeito da idade relativa em jogadoras de élite de andebol, assim como valorar este efeito em função das variáveis antropométricas, de condição física e técnico-táticas (velocidade de remate). Foram avaliadas 136 jogadoras de andebol das oito primeiras equipas da divisão de honra. Encontrou-se um efeito de idade relativa (foi usado o teste qui-quadrado) nas jogadoras de andebol sustentado pelas que participam nas seleções nacionais. Não se encontrou efeitos de idade relativa nas variáveis antropométricas, nem na velocidade de remate com e sem interação. A lateralidade e o Squat Juam (SJ) apresentaram um efeito de idade relativa. A idade relativa é importante para chegar às seleções, mas para jogar na categoria máxima o efeito da idade relativa parece perder significado. São necessários mais estudos sobre o efeito da idade relativa no andebol feminino.

scholarly journals RELATIVE AGE EFFECT AMONG YOUNG CROATIAN TAEKWONDO COMPETITORS

2021 ◽  
pp. 86-89
Author(s):  
Matej Babić ◽  
Dražen Čular ◽  
Igor Jelaska
Keyword(s):  
Age Effect ◽  
Chi Square ◽  
Weight Category ◽  
Relative Age ◽  
Relative Age Effect ◽  
Significant Difference ◽  
Chi Square Test ◽  
Age Range ◽  
Effect Of Age ◽  
Selection Of

Aim of this research was to identify and analyse relative age effect (RAE) on sample composed of young Croatian taekwondo competitors. In order with aim of research, for medal winners (n1=72) and other competitors (n2=187) who competed at Croatian taekwondo cadet championship 2015, date of birth, weight category and sport success were extracted. By conducting of Chi-square test on all competitors (n=259) it is proven there is non-significant difference (χ2=12.28; p=0.34) between expected and observed frequencies according to month of birth. Furthermore, significant difference between observed and expected frequencies according to year of birth of medal winners (χ2=45.31; p<0.01) is confirmed. Results of this research are pointing on presence of RAE which could lead to mistakes in selection of young athletes. Authors are suggesting to minimize allowed age range for competition, or to separate competitors in more age categories, which would enable more equal competitions and reduce effect of age on sport success.

The Relative Age Effect in Top100 Female Tennis Players (2014–2018)

2020 ◽  
Author(s):  
Adrián Agricola ◽  
Michal Bozděch ◽  
Martin Zvonař ◽  
Jiří Zháněl
Keyword(s):  
Statistical Analysis ◽  
Effect Size ◽  
Age Effect ◽  
Chi Square ◽  
Tennis Players ◽  
Relative Age ◽  
Relative Age Effect ◽  
Small Influence ◽  
Chi Square Test ◽  
Medium Influence

The theory of Relative Age Effect (RAE) works on the assumption that athletes born at the beginning of a calendar year are more successful than athletes born in the end of the year. The athletes born early have a significant probability of a higher level of physiological, mor-phological and psychological abilities than later born athletes. Several studies show that the RAE was not found in females or it was significantly lower than in males. The research objective was to find out the influence of RAE in WTA Tour TOP100 female professional tennis players (n=500) in 2014–2018. Cohen’s effect size (ES) w was calculated to assess the level of the influence of RAE. To assess the differences between the observed and the expected relative age quarter distribution, Chi-Square test (ꭕ2) was used. In terms of effect size (ES), a medium influence of RAE has been proven in 2016 and 2017 (w = 0.33, resp. w = 0.30); a small influence has been proven in years 2014, 2015, 2018 and in the whole observed period 2014–2018. Based on statistical analysis, the influence of RAE cannot be rejected in years 2016 (p 0.05). The next step was to assess the influence of RAE on the final WTA ranking in 2014–2018. Players have been divided into four intervals: 1–25, 26–50, 51–75 and 76–100 positions. ES has showed the medium influence of RAE in 76–100 positions (w = 0.34); only small influence of RAE was found in other positions. Statistical analysis showed that the influence of RAE cannot be rejected in 1–25, 26–50 and 76–100 positions (p < 0.05): it can be rejected in 54–75 positions. The results of the research have shown the medium influence of RAE in 2016 and 2017: in the recent years (and in the whole observed period of 2014–2018), the influence of RAE was small. The influence of RAE on the final WTA ranking is also small, except the 76–100 positions.

scholarly journals The relative age effect in Brazilian soccer: so what?

2020 ◽  
Vol 13 (2) ◽  
pp. 65-70
Author(s):  
Dalmo Roberto Lopes Machado ◽  
Pedro Pugliesi Abdalla ◽  
Ana Claudia Rossini Venturini ◽  
André Pereira Dos Santos ◽  
Nilo Cesar Ramos ◽  
...  
Keyword(s):  
Physical Fitness ◽  
Partial Correlation ◽  
Technical Skills ◽  
Age Effect ◽  
Soccer Players ◽  
Chi Square ◽  
Youth Soccer ◽  
Relative Age ◽  
Relative Age Effect ◽  
Significant Difference

Objectiveː our purpose was a) to describe the Relative Age Effect occurrence in Brazilian elite youth soccer players; b) to identify the association between Relative Age Effect and technical skills and c) to examine how Relative Age Effect can affect Physical Fitness. Method: Eighty-one Brazilian elite soccer players from three age-group teams (U-15, U-17 and U-20) were classified by birth quartiles according to their date of birth. Relative Age Effect was determined when there was a statistically significant difference between players who were born in BQ1 (January through March) to the other birth quartiles (Chi-Square). The association between Relative Age Effect and Technical Rankings was verified by the correlation. The partial correlation controlled for date of birth and for maturity offset was also performed. Relative Age Effect on Physical Fitness was verified by the variance (ANOVA) of its components on each team’s birth quartiles. Results: Players born in BQ1 were the most selected in U-15 (60%) and U-17 (35%) teams, but not in U-20 (25%). A low to moderate (Rho = 0.04 to 0.53) correlation was found between birth quartiles and Technical Rankings, while date of birth and maturation (partial correlation) effects were identified in the U-15 team. Although birth quartiles do not affect Physical Fitness (ANOVA), it may favour some Physical Fitness components (p < 0.05). Conclusions: The greater risk of Relative Age Effect in younger teams is due to the greater emphasis on technical skills. When date of birth and maturation are controlled for, the association between Technical Rankings and birth quartiles is reduced. There was no evidence that Relative Age Effect affected the players’ game performance.

scholarly journals Relative Age Effect in Elite German Soccer: Influence of Gender and Competition Level

2021 ◽  
Vol 11 ◽  
Author(s):  
Martin Götze ◽  
Matthias W. Hoppe
Keyword(s):  
Effect Size ◽  
Age Effect ◽  
Effect Sizes ◽  
Large Effect Size ◽  
Chi Square ◽  
Relative Age ◽  
Relative Age Effect ◽  
Small Effect Size ◽  
Competition Level ◽  
German Adult

The relative age effect (RAE) is associated with (dis)advantages in competitive sports. While the RAE in elite male soccer reveals a skewed birthdate distribution in relation to a certain cut-off date, research of RAE in elite female soccer is affected by small number of samples and conflicting results. The purpose of this study was to investigate the RAE in elite adult German soccer regarding gender and competition level. The sample comprised 680 female and 1,083 male players of the two top German leagues during the 2019/20 season and German national teams (A-Team to Under 19). Differences between the observed and expected birthdate distributions were analyzed using chi-square statistics and effect sizes followed by calculating odds ratios. Results showed a statistically significant RAE with small effect size across all players included for both genders (female players: P &lt; 0.001, W = 0.16, male players: P &lt; 0.001, W = 0.23). The identified RAE was based on an over-representation of players born at the beginning of the year. According to gender and competition level, RAEs were more pronounced in German male soccer. While significant RAEs were found among males in the first two leagues (first league: P &lt; 0.001, W = 0.19, second league: P &lt; 0.001, W = 0.26), the RAE of females was more pronounced in the second league (first league: P = 0.080, W = 0.16, second league: P = 0.002, W = 0.20). The analysis of RAE regarding the national teams revealed a statistically significant RAE with large effect size for only the youngest investigated age group of male players (Under 19: P = 0.022, W = 0.52). Our data show an RAE in female and male German adult soccer, which could be accompanied by a loss of valuable elite players during the youth phase of the career. Consequently, the pool of talented players at the adult level would be limited.

scholarly journals Distribuição do mês de nascimento e medidas antropométricas de jogadores de futebol de elite nacional sub-15

2018 ◽  
Vol 20 (2) ◽  
pp. 211-218 ◽  
Author(s):  
Juliana Melo Altimari ◽  
Henrique Bortolotti ◽  
Nelson Dos Santos-Junior ◽  
Leandro Ricardo Altimari ◽  
Antonio Carlos de Moraes
Keyword(s):  
Body Mass ◽  
Soccer Players ◽  
Birth Date ◽  
Chi Square ◽  
Significance Level ◽  
Relative Age ◽  
Relative Age Effect ◽  
Birth Month ◽  
Chi Square Test ◽  
Selection Of

The aim of this study was to analyze the birth month distribution and anthropometric measurements of U-15 elite soccer players. The sample consisted of 400 athletes (15.4 ± 0.4 years, 171.0 ± 10.6 cm and 63.0 ± 8.8 kg) participants of the 11th edition of the Brazil U-15 Soccer Cup, who had their birth month information and height and body mass measures obtained from data available on the organization’s website. Athletes were separated according to the categorization of chronological age into four-month periods: 1st quarter (1st QDT), athletes born between January and April; 2nd quarter (2nd QDT), those born between May and August, and 3rd quarter (3rd QDT), those born between September and December. The non-parametric chi-square test (X2) was used to analyze the possible differences between observed and expected birth date distributions in the four-month periods. The significance level was P<0.05. The results show that the number of players born in 1st QDT was higher when compared to 2nd QDT and 3rd QDT (P<0.05), and higher when compared to 2nd QDT with 3rd QDT (P<0.05). For variables height and body mass, it was observed that players born in 1st QDT presented values significantly higher than those born in 2nd QDT and 3rd QDT (P<0.05). In the same way, players born in 2nd QDT presented higher values than those born in 3rd QDT (P<0.05).It could be concluded that the relative age effect exerts an influence on the selection of Brazilian U-15 soccer players because it is associated with differences in the anthropometric characteristics of these young players.

scholarly journals Relative Age Effect and Long-Term Success in the Spanish Soccer and Basketball National Teams

2018 ◽  
Vol 65 (1) ◽  
pp. 197-204 ◽  
Author(s):  
Cristina López de Subijana ◽  
Jorge Lorenzo
Keyword(s):  
Selection Process ◽  
Age Effect ◽  
Basketball Players ◽  
National Team ◽  
Relative Age ◽  
Relative Age Effect ◽  
Professional Soccer ◽  
Premier League ◽  
Talent Selection

AbstractThe aims of this study were: i) to analyze whether relative age effect occurs in the athletes of the junior national teams and professional athletes in Spain in general and in soccer and basketball, and ii) to compare the long-term success of the players selected for the junior national team between these sports. The samples for this study were Spanish professional soccer (n = 461) and basketball (n = 250) players in the 2013-2014 premier league and players from the junior Spanish soccer (i.e., n = 273; U-17: n = 107; U-19: n = 166) and basketball (i.e., n = 240; U-18: n = 120, U-16: n = 120) teams that classified to play in the European Championships (from 2004 to 2013). Junior players (42.3%) were more frequently born in the 1st quarter of the year than the professional players (30.7%) (χ2(3) = 30.07; p = .001; Vc = .157). This was found in both basketball (χ2(3) = 12.2.; p = .007; Vc = .158) and soccer (χ2(3) = 20.13; p < .001; Vc = .166). Long-term success is more frequent in soccer, where 59.9% of the juniors selected for the national team played later in the premier league, while in basketball that percentage was 39.6% (χ2(1) = 14.64; p < .001; Vc = .201). On the other hand, 79.4% and 39.8% of the professional soccer and basketball players had been previously selected for junior national teams (χ2(1) = 60.2; p < .001; Vc = .386), respectively. The talent selection process should be reviewed as players born in the second half of the year have fewer opportunities to stand out.

scholarly journals The relative age-related participation trends in European Badminton

2021 ◽  
Vol 13 (2) ◽  
pp. 37-45
Author(s):  
MERT BILGIC ◽  
ERHAN DEVRILMEZ
Keyword(s):  
Goodness Of Fit ◽  
Age Effect ◽  
The Other ◽  
Equal Opportunities ◽  
Chi Square ◽  
Relative Age ◽  
Goodness Of Fit Tests ◽  
Relative Age Effect ◽  
Age Related ◽  
European Youth

Background: T he purpose of this study was to identify the relative age effect (RAE) in European youth badminton through examining participation trends. Material and methods: T he birthdate distributions of 1909 badminton players (males = 994, females = 915) participating in the last three consecutive European U15, U17 and Junior (U19) Badminton Championships were analysed. Chi-square (χ²) goodness-of-fit tests were used to determine inter-quartile differences, and odds ratios (OR) and 95% confidence intervals were calculated in order to compare quartiles with each other. Results: Statistically significant over-representation of players born shortly after the cut-off date was determined. Regarding gender, RAE was more notable in males compared to females, and the strongest results were determined in U15 compared to the other age categories. Moreover, striking trends were determined in Q1–Q4 comparisons, particularly as players in Q1 were more than twice for females and thrice for males as likely to participate in the European Badminton Championships. Conclusions: F indings of this study confirm the presence of RAE in European youth badminton though decreasing its intensity with age. Certain precautions or different approaches should be taken into consideration to organize the age categories, such as biological markers, variations, rotations or age quota for equal opportunities.

scholarly journals The Relative Age Effect in Czech U14 Male and Female Tennis Players in 2007–2016

2021 ◽  
Vol 15 (2) ◽  
pp. 50-60
Author(s):  
Roman Koloničný
Keyword(s):  
Goodness Of Fit ◽  
Age Effect ◽  
Goodness Of Fit Test ◽  
Chi Square ◽  
Male And Female ◽  
Tennis Players ◽  
Relative Age ◽  
Relative Age Effect ◽  
Junior Tennis ◽  
The Impact

The issue of the Relative Age Effect (RAE) has been long researched, discussed and published both in the academic and coaching community and the number of studies on it in various sports has significantly grown in recent years. The aim of this study was to verify the existence of RAE among Czech male (n = 6552) and female (n = 4131) junior tennis players and to identify possible differences in birthdate effect between male and female players. The research was carried out in players registered in the years 2007–2016 in the U14 age category in Czech Tennis Association (CTA) database; the athletes were divided into three subgroups (‘Ranked’, ‘Top 100’, ‘Top 10’). Research data were analysed by the methods of descriptive and inferential statistics: relative and absolute frequency, chi-square goodness of fit test () and chi-square test of independence () with the use of effect size (ES index w). A declining tendency of frequencies from Q1 to Q4 between male and female junior players was proven in all three subgroups.In the whole period of 2007–2016, a significant and strong RAE was demonstrated only in the ‘Top 10’ male subgroup (RAE was significant and ES was small or trivial in the other two subgroups). Among the female players, RAE was significant in all three subgroups (ES was small or trivial). Gender differences in RAE in favour of male players were significant in ‘Top 100’ and ‘Ranked’ (ES was small or trivial in all three subgroups). In the short and long term, RAE can have significant implications for the sport development of athletes; both coaches and the professional public can therefore be recommended to pay attention to this issue. The impact of RAE in sport, i.e. the uneven distribution of athletes’ birthdates, is more pronounced especially among junior athletes and often significantly affects their sports development and career.

scholarly journals Relative Age Effect in the Sport Environment. Role of Physical Fitness and Cognitive Function in Youth Soccer Players

2019 ◽  
Vol 16 (16) ◽  
pp. 2837 ◽  
Author(s):  
Florentino Huertas ◽  
Rafael Ballester ◽  
Honorato José Gines ◽  
Abdel Karim Hamidi ◽  
Consuelo Moratal ◽  
...  
Keyword(s):  
Physical Fitness ◽  
Selection Process ◽  
Age Effect ◽  
Anthropometric Measures ◽  
Cross Sectional ◽  
Youth Soccer ◽  
Relative Age ◽  
Relative Age Effect ◽  
Attentional Functioning ◽  
Age Related

The need to achieve short-term competitive outcomes in sports may influence the emergence of talent selection strategies, which could bias individuals’ opportunities. The present study aimed to further explore the relative age effect (RAE), a phenomenon that strongly influences youth sport development. The RAE refers to a disproportionately high percentage in sport teams of athletes born early in the selection year. Our primary focus was to explore whether the RAE is supported by behavioral evidence in favor of better fitness—and especially cognitive-attentional functioning—of early as compared to late-born players. A cross-sectional study was conducted on 105 young athletes (u10, n = 52; 9.8 ± 0.3 years old, and u12, n = 53; 11.8 ± 0.2 years old) attending two youth elite soccer academies. Attentional functioning, anthropometrics, physical fitness, and game intelligence were compared across two Age Groups (u10 vs. u12) and four Birth Quarters (BQ1–BQ4). The RAE was statistically significant (p < 0.001), showing that about 50% of participants were born in the first quarter and 75% were born in the first half of the year. More importantly, U12 players outperformed u10 players in measures that were related to sustained attention (with faster and less variable responses; p < 0.001 and p < 0.05, respectively), and in all anthropometric measures (p < 0.001), physical-fitness capacities (p < 0.05). Crucially, neither the attentional measures, game intelligence, anthropometrics, nor physical fitness were affected by BQ (all ps > 0.1 and BF10 between 0.08 and 0.6, showing strong evidence for the null hypothesis). The present findings suggest that the early selection process that occurs during scouting in youth soccer academies offsets the age-related differences that could be anticipated in cognitive skills, anthropometrics, and physical abilities, due to growth and maturation. These birth asymmetries could lead teams to disregard later maturation athletes and athletes born later in the year inducing a larger dropout of those players with the consequent reduction in the talent pool.

scholarly journals The Relative Age Effect in Poland's Elite Youth Soccer Players

2018 ◽  
Vol 64 (1) ◽  
pp. 265-273 ◽  
Author(s):  
Krystian Rubajczyk ◽  
Andrzej Rokita
Keyword(s):  
Selection Process ◽  
Age Effect ◽  
Soccer Players ◽  
Youth Soccer ◽  
Youth Athletes ◽  
National Team ◽  
Relative Age ◽  
Relative Age Effect ◽  
Younger Age ◽  
Biological Development

Abstract The relative age effect (RAE) is related to discrimination against youth athletes born in the last quarter of the calendar year. The current study presents research on the RAE in elite youth soccer players in Poland. Players in the Central Junior League (CLJ) finals represent 0.59% of the 25,756 players under 20 years old (U20). This study analyzed the post-game protocols of the CLJ knockout stage from the 2013/2014 and 2014/2015 seasons as well as the U17-U21 teams during 2015, including only players who played on the field for at least one minute (n = 395). The results revealed the existence of RAE in the examined groups ( CLJ 2013/2014, χ23 = 15.441, p < 0.01, CLJ 2014/2015, χ23 = 20.891, p < 0.001 U17-U21, χ23 = 25.110, p < 0.001). In addition, the results differed by monthly birth distribution in the Polish population (PP) between 1995 and 1999. This study is the first to examine the RAE in youth soccer in Poland. The occurrence of the RAE with regard to the most promising youth and national team players suggests that a similar effect exists among younger age categories. To reduce the RAE related to identifying soccer talent, tools should be implemented to optimize the player-selection process, such as those that consider the biological development of a player.

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