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    Bio-Banding in Judo: The Mediation Role of Anthropometric Variables on the Maturation Effect
    (MDPI, 2020) Giudicelli, Bruno B.; Luz, Leonardo G. O.; Sogut, Mustafa; Massart, Alain G.; Junior, Arnaldo C.; Figueiredo, Antonio J.
    Young judo athletes are bio-banding based on age and body mass and compete in weight classes. The purposes of this study were to investigate the influences of maturation on physical performance in young judokas through controlling the chronological age and body mass, and to examine the mediating role of anthropometric variables. Sixty-seven judokas, aged 11.0-14.7, were measured for 11 anthropometric and seven physical performance variables. Pearson partial correlations were conducted to verify the relationship between the maturational indicator and the dependent variables. Mediation analyses were performed to identify the extent to which anthropometric variables mediate the relationship. The maturation effect remained on the aerobic capacity and handgrip strength (p < 0.05). Fat mass (b = 80.335, 95%CI 11.580-204.270) and fat-free mass (b = 108.256, 95%CI 39.508-207.606) totally mediated the effect on aerobic capacity. Fat mass (b = 0.023, 95%CI 0.004-0.057), fat-free mass (b = 0.029, 95%CI 0.011-0.058), stature (b = 0.031, 95%CI 0.008-0.061), arm span (b = 0.021, 95%CI 0.003-0.044), and inferior members length (b = 0.022, 95%CI 0.005-0.049) totally mediated the effect on handgrip strength. The effect of biological maturation is noticeable even after age and body mass control, being mediated by anthropometric variables related to body composition and size.
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    MATURITY-ASSOCIATED VARIATIONS IN ANTHROPOMETRY, PHYSICAL FITNESS, AND SPORT-SPECIFIC SKILLS AMONG YOUNG MALE AND FEMALE FUTSAL PLAYERS
    (Termedia Publishing House Ltd, 2022) Sogut, Mustafa; Yapici, Hakan; Luz, Leonardo G. O.; Giudicelli, Bruno; Clemente, Filipe Manuel; Dogan, Ali Ahmet
    Purpose. The aim of this study was to determine the maturity -related variations in anthropometry, physical fitness, and sport -specific skills among young male and female futsal players. Methods. Overall, 77 athletes (44 boys and 33 girls) aged 10.5-13.7 (12.3 +/- 0.9) years were measured for stature, body mass, 2 skinfolds, as well as 3 fitness and 2 sport -specific test items. Results. Compared with boys, girls were significantly more advanced in maturation and had greater body mass index and body fat percentage. Except for the countermovement jump result, boys outperformed girls in all fitness and sport -skill assessments. Regardless of gender, early maturing players were significantly taller and heavier and had higher body fat percentage and grip strength than their late maturing counterparts. In boys, none of the other physical fitness and sport -specific skill measures significantly differed between contrasting maturity groups. In turn, early maturing girls had significantly better scores in all physical fitness measurements than late maturing girls. Partial correlations, with chronological age controlled as a covariate, indicated moderate to high correlations between the maturation indicator and stature and body mass in both boys and girls. Except for grip strength and dribbling tests for boys and girls, respectively, other physical fitness and sport -specific skill measures did not show a significant correlation with maturity status. Conclusions. These results highlight that rather than with functional and sport -specific characteristics, physical maturity status may be associated with greater body size in young futsal players.
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    Ranking in young tennis players-a study to determine possible correlates
    (Springer, 2019) Sogut, Mustafa; Luz, Leonardo G. O.; Kaya, Omer Baris; Altunsoy, Kuebra
    The purpose of this study was to examine the associations of physical, functional, experiential, and training-related characteristics with ranking in a cohort of competitive U12 tennis players. A total of 119 (boys= 68, girls= 51) nationally ranked Turkish players aged 9.6-12.3 years (10.9 +/- 0.7) were measured on stature, sitting height, body mass, skinfolds, grip strength, and agility. Age at peak height velocity (APHV), percentage of predicted adult stature (PAS%), body mass index (BMI), body fat percentages (BF%) and growth status were calculated. Weekly training hours and experiences in regular tennis training and tournament play were recorded. Compared to boys, girls were found to be significantly taller and more advanced in maturation. There were no significant relationships between growth, APHV, BMI, BF% and rankings. In girls, PAS% was significantly correlated with ranking. Results revealed that variables regarding experience, training volume, and motor performance were significantly associated with ranking in both boys and girls. Age to start regular training (r= -0.540) for the girls and weekly training volume (r= -0.489) for the boys were the most correlated variables. These results were confirmed by logistic regression models. The findings highlight the possible positive consequences of early participation in regular tennis training and tournaments, rather than growth and body composition, on the ranking of U12 tennis players in both genders.