Associations between match participation, maturation, physical fitness, and hormonal levels in elite male soccer player U15: a prospective study with observational cohort

Eskandarifard, Ebrahim; Nobari, Hadi; Clemente, Filipe Manuel; Silva, Rui; Silva, Ana Filipa; Figueiredo, A.

doi:10.1186/s12887-022-03257-7

Cited by 6 publications

(4 citation statements)

References 61 publications

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“…Despite not being verified RAE in the shallow races in the under-16 in the feminine, very practised, there is a greater incidence of those born in the first semester concerning the second semester, compared to the races with hurdles, where there is more balance between the births. In this case we should also consider the explanation of Beunen et al [ 32 ], emphasizing that at the peak of maturation in girls there is an increase in mass. According to Garlipp et al [ 33 ], this gain in body mass is due to the increase in height and fat mass of girls, thus allowing the inference that this would not be an advantage for shallow tests in athletics.…”

Section: Discussionmentioning

confidence: 84%

Relative age effects on speed trials in Brazilian athletics

Barboza-Neto

Nobari

Aidar

et al. 2023

BMC Sports Sci Med Rehabil

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Background Relative age effect (RAE) is a concept related to the possible advantage that older athletes would have over younger ones within the same category. Although many studies have approached this subject in individual sports, there are few clippings by events within the sport. More detailed analyses are necessary for a better understanding of how RAE behaves in sports, especially in athletics, the subject of this study. The objective of this study was to analyze the RAE on speed in track and field events as a whole, separating the flat races from the hurdles races. Methods The Brazilian Ranking of Brazilian Athletics Confederation was used for data analysis, and the sample was composed of the 50 best-placed marks in the ranking of speed events in athletics in the categories Under(U)-16 and U-18 (female and male). Statistical analysis was calculated by chi-square, and the effect size was checked by Cramer’s V. Likelihood-ratio test (L-Ratio) assessed the probability of the RAE occurring in the total sample and by age groups. Results In the total sample the results pointed to the emergence of RAE in males in both categories (U-16: p < 0.001; V: 0.13; L-Ratio: 3.64, U-18: p < 0.001; V: 0.13; L-Ratio: 3.80), whereas in females no such effect was found in any category (U-16: p = 0.6; V: 0.09; L-Ratio: 0.09, U-18: p = 0.6; V: 0.07; L-Ratio: 0.12). When the results were separated by type of event, there was only a RAE in the shallow event in the U-18 female category (p = 0.3; V: 0.11; L-Ratio: 8.72). Conclusion The results allow us to conclude that there is a RAE in the speed trials of Brazilian athletics in the U16 and U18 categories for men, while this effect appears only in the shallow trials of the U18 category for women, indicating that the RAE has incidence when there is more participation and competition in the sport.

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Section: Discussionmentioning

confidence: 84%

Relative age effects on speed trials in Brazilian athletics

Barboza-Neto

Nobari

Aidar

et al. 2023

BMC Sports Sci Med Rehabil

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“…According to Nobari et al [67], we can say that TM and TS values are lower than our study throughout the season. In an another study, Nobari et al [8] indicated that TM values average 1.2 A.U. during the season in under-16 soccer players.…”

Section: Discussionmentioning

confidence: 94%

“…According to time-motion analysis, elite professional adult soccer players cover a total distance of approximately 10-12 km at an average intensity close to the anaerobic threshold (80-90% of maximum heart rate) [5,6], and they perform 1350 activities every 4-6 seconds during the game. Approximately 150 to 250 of these activities are short, intense, and explosive activities associated with maximal sprint, acceleration, and change of direction [7,8]. On the other hand, the activity profiles of young soccer players (distance covered, high-intensity activity and sprinting) during the match are low.…”

Section: Introductionmentioning

confidence: 99%

Relationship Between Variations Accumulated Workload and Sprint Performance in Elite Adolescent Soccer Players

Nobari¹,

Saygın²,

Khani³

et al. 2022

J. Mens. Health

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Background:The aim of this study is to analyze the relationship between the accumulated training load parameters (i.e., acute (AWL), chronic (CWL), acute: chronic workload ratio (ACWR), training monotony (TM), and training strain (TS)) and sprint performance variations in elite adolescent soccer players, taking into account the maturation status of the players. Besides, we aimed to use regression models with mentioned parameters, sprint level, and peak height velocity (PHV) as predictors to explain variations in sprint performance during the in-season. Methods: Twenty-seven U16 soccer players (age: 15.5 ± 0.2 years, height: 171 ± 7.3 cm, body mass: 59 ± 6.1 cm, PHV: 14.4 ± 0.7) from one elite soccer national league club were evaluated. In this study was a cohort with monitoring the daily workload for 15 weeks in the competition season: early-season (EaS) weeks (w) W1 to W5; mid-season (MiS) W6 to W10; and endseason (EnS) W11 to W15. Anthropometric and PHV were assessed at the beginning of the season and sprint test was assessed before and after the season. Results: Results showed that there were some significant variations in workload parameters (sprint, AWL and TM) over a soccer season. Regarding comparisons between EaS vs. EnS, there were significant differences in Sprint (p ≤ 0.01; ES: -0.28) and CWL (p ≤ 0.01; ES: -0.80). Sprint performance can be estimated by ACWR, TM, TS and PHV values (R 2 = 0.65). Conclusions: The present study revealed that sprint performance improved throughout the season in young soccer players, with significant intra-season variations, especially in CWL and ACWR load variables (Eas and Mid). In addition, it was observed that maturation did not have a significant effect on the change in sprint performance. This study clearly showed that there is a relationship between sprint performance and accumulated workload variables and that the significant change in sprint performance can be explained by load variables such as AWCR, TM, and TS.

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“…Failure to complete the shuttle run on two successive occasions resulted in the termination of the test and the distance covered represented the final test Life 2023, 13, 1503 6 of 17 result. The club's coaches habitually conducted the YYIRT1 during the season for all agecategories, and the test leaders were also highly familiar with all testing procedures [40,41].…”

Section: Physical Fitness Parameters Yo-yo Intermittent Recovery Test...mentioning

confidence: 99%

The Effect of Environmental Disasters on Endocrine Status, Hematology Parameters, Body Composition, and Physical Performance in Young Soccer Players: A Case Study of the Aral Sea Region

Erkudov

Rozumbetov

Férnandez

et al. 2023

Life

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The Aral Sea region (Uzbekistan) is infamous because of the ecological disaster characterized by the disappearance of the Aral Sea due to excessive uncontrolled water intake for agriculture needs. A new desert occurrence, soil and climate aridization led to pesticide and toxic metals environment pollution. The impact of environmental conditions in some areas of Uzbekistan on the health of soccer players is not as noticeable as, for example, the effectiveness of training, so it is not widely discussed in scientific papers. The aim of the present study was to study the features of endocrine status, hematology parameters (e.g., red blood cells (RBC) and hemoglobin (Hb)), and their influence on body composition and physical fitness performance in local young soccer players of the Aral Sea region as the territory of ecological disaster. The study involved 60 male soccer players aged from 18 to 22 years. Participants were divided into two groups: the experimental group (EG), which consisted of 30 soccer players living on the territory of the Aral ecological disaster region, and the control group (CG), which included 30 soccer players, natives of the ecologically favorable region of Uzbekistan. All volunteers had anthropometric measurements, concentrations of insulin-like growth factor-1 (IGF-1), total testosterone (TT), estradiol (E2), cortisol (C), RBC, and Hb count. Moreover, Yo-Yo Intermittent Recovery Test Level 1 (YYIRT1) and professional skills tests such as dribbling shuttle test (DSt) and goal accuracy test (GAt) were assessed. When comparing the CG group to the EG group, it was observed that the EG group exhibited statistically significantly reduced levels of TT and E2 (p < 0.05). No significant statistical difference was observed between the two groups in terms of IGF-1 and C (p > 0.05). Regarding hematological parameters, Hb, Ht, and mean corpuscular volume (MCV) were found to be significantly lower in the EG compared with the CG (p < 0.05). Moreover, the distance covered in the YYIR1 test was found to be significantly lower in soccer players within the EG compared with the CG (p < 0.05). Additionally, it was determined that there was no significant difference between the groups in terms of DSt and GAt values (p > 0.05). Lastly, significant differences were observed between the EG and CG in terms of anthropometric characteristics (diameters, skinfold, and somatotype profile) (p < 0.05). The present study showed that the changes in evaluated characteristics might result from the complex influence of endocrine-disrupting chemicals, the content of which is high in the environment of the Aral Sea region. The results obtained may help monitor the health of athletes living in an environmentally unfriendly environment.

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Associations between match participation, maturation, physical fitness, and hormonal levels in elite male soccer player U15: a prospective study with observational cohort

Cited by 6 publications

References 61 publications

Relative age effects on speed trials in Brazilian athletics

Relative age effects on speed trials in Brazilian athletics

Relationship Between Variations Accumulated Workload and Sprint Performance in Elite Adolescent Soccer Players

The Effect of Environmental Disasters on Endocrine Status, Hematology Parameters, Body Composition, and Physical Performance in Young Soccer Players: A Case Study of the Aral Sea Region

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