scholarly journals Effects of match period and playing position on the individual and collective dynamics in professional soccer: a case study

2020 ◽  
Vol 22 ◽  
Author(s):  
Gibson Moreira Praça ◽  
André Gustavo Pereira de Andrade ◽  
Sarah da Glória Teles Bredt ◽  
Pedro Emilio Drumond Moreira ◽  
Gustavo De Conti Teixeira Costa ◽  
...  
Keyword(s):  
T Test ◽  
Soccer Players ◽  
Width Ratio ◽  
Collective Variables ◽  
Professional Soccer ◽  
Spatial Exploration ◽  
The Individual ◽  
Positional Data ◽  
Paired T Test

Abstract This study aimed to compare the width, the length, the length per width ratio, and the stretch index between the first and the second halves in official soccer matches, and to compare the spatial exploration index between players from different positions. Seventeen professional soccer players from a Brazilian club participated in the study and were monitored during six official matches by a GPS device. Collective positional data were compared between the two halves using a paired t-test, while the spatial exploration index was compared between the playing positions and within the halves by a mixed two-way ANOVA. The results revealed no differences between the two halves for the collective variables. The highest values of spatial exploration index were reported for central midfielders and wing forwards. We conclude that the tactical behavior of professional soccer players is position-dependent, and midfielders are the most exploratory players on the pitch.

scholarly journals Comportamento tático coletivo em Pequenos Jogos no Futebol: influência de jogadores adicionais

2016 ◽  
Vol 18 (1) ◽  
pp. 62 ◽  
Author(s):  
Gibson Moreira Praça ◽  
Hugo Folgado ◽  
André Gustavo Pereira de Andrade ◽  
Pablo Juan Greco
Keyword(s):  
The Other ◽  
Soccer Players ◽  
Width Ratio ◽  
Collective Variables ◽  
Other Hand ◽  
Centroid Distance ◽  
Friedman's Test ◽  
Polar Coordinate ◽  
Length Width ◽  
Positional Data

DOI: http://dx.doi.org/10.5007/1980-0037.2016v18n1p62 The aim of this study was to compare the collective tactical behavior between numerically balanced and unbalanced small-sided soccer games. Eighteen male soccer players (mean age 16.4 years) participated in the study. Polar coordinate analysis was performed using positional data obtained with a 15-Hz GPS device. Collective variables including length, width, centroid distance (average point between teammates), and length per width ratio (LPWratio) were collected. Data were analyzed using Friedman’s test. The results showed greater length and width values in 4vs.3 games, while a higher LPWratiowas observed in 3vs.3+2 games compared to the other configurations. In games with an additional player (4vs.3), ball circulation and the increase in effective game space were alternatives to overcome the more concentrated defensive systems near the goal. On the other hand, 3vs.3+2 games allowed more actions in the length axis and a fast reach of the opponent’s goal.

How media influence is perceived by professional soccer players: a qualitative case study in Portugal

2021 ◽  
pp. 1-12
Author(s):  
Tatiana Fazenda ◽  
Aldo M. Costa ◽  
Alexandre Garcia-Mas ◽  
Pedro G. Carvalho
Keyword(s):  
Qualitative Case Study ◽  
Soccer Players ◽  
Media Influence ◽  
Professional Soccer

scholarly journals Evaluación y relación entre distintos parámetros de condición física en futbolistas semi profesionales (Evaluation and relationship among different fitness parameters in semi professional soccer players)

Retos ◽  
2015 ◽  
pp. 114-117
Author(s):  
Javier Yanci Irigoyen ◽  
Alberto García Huerta ◽  
Daniel Castillo Alvira ◽  
Luis Ángel Rivero Benito ◽  
Asier Los Arcos Larumbe
Keyword(s):  
Average Distance ◽  
T Test ◽  
Soccer Players ◽  
Arm Swing ◽  
Change Of Direction ◽  
Professional Soccer ◽  
Palabras Clave ◽  
Fitness Parameters ◽  
Cardiovascular Capacity ◽  
Jump Ability

Los objetivos de este estudio fueron, por un lado, evaluar la capacidad cardiovascular, el rendimiento en el sprint en línea recta, la capacidad de cambio de dirección (CODA) y el salto horizontal en jugadores de fútbol semi profesionales, y por otro, examinar la relación existente entre las distintas capacidades analizadas. En este estudio participaron 18 jugadores de fútbol semi profesionales (25.6 ± 4.8 años, 1.82 ± .1 m, 77.9 ± 7.1 kg, 23.6 ± 1.8 kg·m-2). El VO2max estimado obtenido en el test intermitente de resistencia Yo-Yo nivel 1 (YYIR1) fue de 51.70 ± 3.94 ml·kg-1·min-1. Los resultados en el sprint 5 m (SP5), 15 m (SP15) y en el Modified Agility T-test (MAT) fueron de 1.01 ± .05 s, 2.39 ± .10 s y 4.89 ± .23 s, respectivamente. En la capacidad de salto horizontal (SH) se obtuvo una distancia media de 1.97 ± .15 m para el salto con contra movimiento (HCMJ) y de 2.37 ± .16 m para el salto con contra movimiento con manos libres (HCMJAS). Se observaron correlaciones significativas y altas entre los valores de SP15 con el MAT (r = .757, p < .01) y con el HCMJ (r = -.749, p < .01). Debido a las altas correlaciones encontradas entre las distintas cualidades anaeróbicas, podría resultar interesante implementar entrenamientos específicos de salto horizontal en las rutinas de entrenamiento con el fin de mejorar el rendimiento en la capacidad de aceleración y la capacidad de cambiar de dirección de los futbolistas. Palabras clave: aceleración, agilidad, salto horizontal, resistencia, correlación, rendimiento.Abstract: The aims of this study were, first, to analyze cardiovascular capacity, performance in the straight sprint, change of direction ability (CODA) and horizontal jump ability in semi-professional soccer players, and secondly, to examine the relationship among the different abilities. This study involved 18 semi professional soccer players (25.6 ± 4.8 years, 1.82 ± .1 m, 77.9 ± 7.1 kg, 23.6 ± 1.8 kg·m-2). The estimated VO2max obtained in the Yo-Yo intermittent endurance level 1 test (YYIR1) was 51.70 ± 3.94 ml·kg-1·min-1. The results in the 5 m sprint (SP5), 15 m sprint (SP15) and Modified Agility T-test (MAT) were 1.01 ± .05 s, 2.39 ± .10 s and 4.89 ± .23 s, respectively. In the horizontal jump (HJ) an average distance of 1.97 ± .15 m for the countermovement jump (HCMJ) and 2.37 ± .16 m for the arm swing counter movement jump (HCMJAS) was obtained. Significant and high correlations between the values   of SP15 and MAT (r = 0.757, p < .01) and the HCMJ (r = -.749, p < .01) were observed. Correlations found among different anaerobic qualities, can lead us to think that it might be interesting to implement specific horizontal jump training routines to improve performance of sprint and change of direction abilities in soccer players.Key words: acceleration, agility, horizontal jump, endurance, correlation, performance.

Z-scores-based methods and their application to biological monitoring: an example in professional soccer players

Biostatistics ◽  
2017 ◽  
Vol 20 (1) ◽  
pp. 48-64
Author(s):  
Guillaume Saulière ◽  
Jérôme Dedecker ◽  
Laurie-Anne Marquet ◽  
Pierre Rochcongar ◽  
Jean-Francois Toussaint ◽  
...  
Keyword(s):  
Reference Population ◽  
Abnormal Behavior ◽  
Soccer Players ◽  
Clinical Patient ◽  
Professional Soccer ◽  
Starting Point ◽  
Significance Levels ◽  
Z Scores ◽  
The Individual

Summary The clinical and biological follow-up of individuals, such as the biological passport for athletes, is typically based on the individual and longitudinal monitoring of hematological or urine markers. These follow-ups aim to identify abnormal behavior by comparing the individual’s biological samples to an established baseline. These comparisons may be done via different ways, but each of them requires an appropriate extra population to compute the significance levels, which is a non-trivial issue. Moreover, it is not necessarily relevant to compare the measures of a biomarker of a professional athlete to that of a reference population (even restricted to other athletes), and a reasonable alternative is to detect the abnormal values by considering only the other measurements of the same athlete. Here we propose a simple adaptive statistic based on maxima of Z-scores that does not rely on the use of an extra population. We show that, in the Gaussian framework, it is a practical and relevant method for detecting abnormal values in a series of observations from the same individual. The distribution of this statistic does not depend on the individual parameters under the null hypothesis, and its quantiles can be computed using Monte Carlo simulations. The proposed method is tested on the 3-year follow-up of ferritin, serum iron, erythrocytes, hemoglobin, and hematocrit markers in 2577 elite male soccer players. For instance, if we consider the abnormal values for the hematocrit at a 5% level, we found that 5.57% of the selected cohort had at least one abnormal value (which is not significantly different from the expected false-discovery rate). The approach is a starting point for more elaborate models that would produce a refined individual baseline. The method can be extended to the Gaussian linear model, in order to include additional variables such as the age or exposure to altitude. The method could also be applied to other domains, such as the clinical patient follow-up in monitoring abnormal values of biological markers.

scholarly journals Manipulating the Pitch Size Constrains the Players’ Positioning during Unbalanced Soccer Small-Sided Games Played by Different Age Groups

Kinesiology ◽  
2021 ◽  
Vol 53 (2) ◽  
pp. 206-214
Author(s):  
Gibson Moreira Praca ◽  
André Gustavo Pereira de Andrade ◽  
Cristóvão de Oliveira Abreu ◽  
Pedro Emilio Drumond Moreira ◽  
Filipe Manuel Clemente ◽  
...  
Keyword(s):  
Age Groups ◽  
Width Ratio ◽  
Complex Task ◽  
Age Group ◽  
Task Context ◽  
Length Width ◽  
Spatial Exploration ◽  
Pitch Length ◽  
The Impact ◽  
Positional Data

We aim to investigate the impact of variable soccer pitch sizes on the position of players during unbalanced small-sided games (SSGs) and compare the responses of players from two different age groups. Forty-eight young players (n = 24 under-13 and n = 24 under-14) took part in the study and played 3 vs. 3 + 1 SSGs on two different pitch sizes (smaller: 36 x 27 m / 139m2 per player; and larger: 40 x 29 m / 166 m2 per player). Players’ positions on the pitch (length, width, length-to-width ratio, stretching index, and spatial exploration index) were assessed by the positional data provided by global position system devices and were compared within age groups and between game formats using a two-way analysis of variance. Results showed higher values of spatial exploration index in the larger SSGs than in the smaller format (p&lt;.001). Moreover, a higher length (p&lt;0.001) and length-to-width ratio (p&lt;.001) was observed in the younger group. Finally, the larger format presented higher values of SEI and stretching index, independent of the age group (p&lt;.001). In the smaller format, U-14 players presented a higher stretching index, while in the larger format U-13 players presented higher values in the same variable. We conclude that enlarging the pitch size constrains players’ behaviour during SSGs, and older players are more able to deal with this more complex task context than younger ones.

Effect of a mindfulness programme training to prevent the sport injury and improve the performance of semi-professional soccer players

2019 ◽  
Vol 27 (6) ◽  
pp. 589-595
Author(s):  
Majid Mozafari Zadeh ◽  
Bita Ajilchi ◽  
Zahra Salman ◽  
Steve Kisely
Keyword(s):  
Pilot Trial ◽  
Intervention Group ◽  
Well Being ◽  
Soccer Players ◽  
Injury Rates ◽  
Professional Soccer ◽  
Post Test ◽  
Improved Performance ◽  
The Individual ◽  
Randomised Controlled

Objective: Mindfulness improves psychological outcomes. We examined whether greater mindfulness scores were associated with reduced injury rates in soccer players, as well as improved performance at both the individual and team level. Method: This was a parallel-group, pre- and post-test, randomised controlled pilot trial. Forty-five male amateur soccer players from Tehran, Iran, were randomly assigned into experimental (n=23) and control groups (n=22). Outcomes were scores on the mindfulness sport inventory, as well as injury rates and recovery as assessed by a physiotherapist using standardised criteria. Expert observers assessed the effect on individual and team performance. Data were analysed using mixed analysis of variance and, where indicated, its non-parametric alternative, the Friedman test. Results: Significantly greater mindfulness scores in the intervention group were associated with both reduced injury and improved performance. Conclusion: Mindfulness training shows promise in preventing injury and improving performance. The intervention could be applied to other sports and be helpful in clinical settings given the importance of exercise in promoting psychological well-being.

Straight-Line and Change-of-Direction Intermittent Running in Professional Soccer Players

2018 ◽  
Vol 13 (5) ◽  
pp. 562-567 ◽  
Author(s):  
Mohamed S. Fessi ◽  
Fayçal Farhat ◽  
Alexandre Dellal ◽  
James J. Malone ◽  
Wassim Moalla
Keyword(s):  
Heart Rate ◽  
Test Performance ◽  
T Test ◽  
Rating Of Perceived Exertion ◽  
Soccer Players ◽  
Peak Heart Rate ◽  
Change Of Direction ◽  
Professional Soccer ◽  
Straight Line ◽  
The Difference

Purpose: To investigate the difference between straight-line (STL) and change-of-direction (COD) intermittent-running exercises in soccer players. Methods: Seventeen male professional soccer players performed the agility T test and 6 intermittent-running exercises: 10 s at 130% of maximal aerobic speed (MAS) alternated with 10 s of rest (10-10), 15 s at 120% of MAS alternated with 15 s of rest (15-15), and 30 s at 110% of MAS alternated with 30 s of rest (30-30) both in STL and with COD. All exercises were monitored using a global positioning system. Heart rate was measured during exercises, and rating of perceived exertion (RPE) was collected postexercise. The difference (Δ) between covered distance in STL and COD exercises at a similar load was calculated, and relationships between T test and Δ distance were analyzed. Results: COD intermittent exercises showed a significantly decreased distance covered and an increase in the number of accelerations, peak heart rate, and RPE compared with STL intermittent exercises at a similar load. High relationships were observed between T-test performance and Δ distance in 10-10 (r = .72, P < .01) and 15-15 (r = .77, P < .01), whereas no significant relationships were observed between T-test performance and Δ distance in 30-30 (r = −.37, P = .2). Conclusion: Intermittent COD exercises were associated with higher acceleration, peak heart rate, and RPE than STL during 10-10 and 15-15 exercises. The ability to rapidly change direction is crucial to perform intense sport-specific running in professional soccer players.

scholarly journals The Relationship between Multiple Intelligences and the Age of Institutional Teachers

2014 ◽  
Vol 5 (2) ◽  
pp. 582-586
Author(s):  
Mani Jouzdani
Keyword(s):  
Foreign Language ◽  
Multiple Intelligences ◽  
T Test ◽  
Multiple Intelligence ◽  
Teaching English ◽  
The Relationship ◽  
Paired T Test

This study tends to investigate whether the age of English as a Foreign Language (EFL) institutional teachers in Isfahan/Iran have any relationship with the intelligence they prefer to use, whether consciously or unconsciously, in teaching English as a foreign language. The intelligences considered for the purpose of this study are namely Interpersonal and bodily/kinesthetic intelligences proposed by Gardner (1983). In order to conduct this investigation a standardized questionnaire based on Berman (2001) and Christison and Kennedy (1999) Multiple Intelligence (MI) checklist was given to 117 male institutional teachers and the results were calculated using a paired T-test also ten interviews were conducted at the end of the case study on ten teachers after observing their classes. The results suggested that as the age of the teacher increase, to some extent, their preference in using interpersonal intelligence over bodily/kinesthetic intelligence increases as well. Also the case study conducted on one of the institutional teachers proved that teachers of older ages prefer using interpersonal intelligence over bodily/kinesthetic one.

scholarly journals Aerobic Fitness of Starter and Non-Starter Soccer Players in the Champion’s League

2018 ◽  
Vol 61 (1) ◽  
pp. 99-108
Author(s):  
Giorgos Paraskevas ◽  
Marios Hadjicharalambous
Keyword(s):  
Oxygen Uptake ◽  
Aerobic Fitness ◽  
Maximal Oxygen Uptake ◽  
Soccer Players ◽  
Individual Response ◽  
Response Patterns ◽  
Biological Variability ◽  
Professional Soccer ◽  
Physiological Evaluation ◽  
The Individual

Abstract To identify individual response patterns in selected aerobic fitness variables of regular starters (ST; N = 7) and non-starters (Non-ST; N = 10), top level professional soccer players were tested for maximal oxygen uptake (VO2max), velocity at 4 mM of lactate (V4), velocity at maximal oxygen uptake (νVO2max) and oxygen pulse (O2-pulse) in July and December following consecutive periods of fixture congestion. V4 was the only variable that increased significantly in December compared to July (15.1 ± 0.5 vs. 14.6 ± 0.5, p = 0.001). There was an almost certain beneficial large mean team change for V4 (ES = 1.2 (0.67; 1.57), 100/0/0), while beneficial mean team changes were less likely for νVO2max and O2-pulse [ES = 0.31 (-0.08; 0.70), 68/30/2 and ES = 0.24 (0.01; 0.49), 64/36/0, respectively] and unclear for VO2max (ES = 0.02 (-0.31; 0.70), 18/69/13). With the exception of V4 where 10 out of 17 players (7 ST and 3 Non-ST) showed positive changes higher than the biological variability, all other variables were characterized by a substantial proportion of changes lower than the biological variability. The present study demonstrated that aerobic fitness variables that require maximal effort may be characterized by greater variability of the individual response pattern compared to that of submaximal aerobic fitness variables irrespective of the accumulated game time. Submaximal aerobic fitness variables appear to be more informative in the physiological evaluation of top level soccer players and this may be an advantage during exposure to periods of consecutive games.

scholarly journals Comparison of the Responsiveness of the Long-Form and Simplified Stroke Rehabilitation Assessment of Movement: Group- and Individual-Level Analysis

2015 ◽  
Vol 95 (8) ◽  
pp. 1172-1183 ◽  
Author(s):  
Yi-Jing Huang ◽  
Kuan-Lin Chen ◽  
Yeh-Tai Chou ◽  
I-Ping Hsueh ◽  
Chieh-Yi Hou ◽  
...  
Keyword(s):  
Stroke Rehabilitation ◽  
Repeated Measurements ◽  
T Test ◽  
Group Level ◽  
Individual Level ◽  
Subacute Stroke ◽  
The Individual ◽  
Movement Group ◽  
Paired T Test ◽  
Rehabilitation Assessment

BackgroundThe group-level responsiveness of the original, 30-item Stroke Rehabilitation Assessment of Movement measure (STREAM-30) is similar to that of the simplified STREAM (STREAM-15), even though the STREAM-30 has twice as many items as those of the STREAM-15.ObjectiveThe purpose of this study was to compare the responsiveness of the STREAM-30 and STREAM-15 at both group and individual levels in patients with stroke. For the latter level, the Rasch-calibrated 27-item STREAM (STREAM-27) was used because the individual-level indexes of the STREAM-30 could not be estimated.DesignA repeated-measurements design was used. In total, 195 patients were assessed with the STREAM-30 at both admission and discharge.MethodsThe Rasch scores of the STREAM-27 and STREAM-15 were estimated from the participants' responses on the STREAM-30. We calculated the paired t-test value, effect size, and standardized response mean as the indexes of group-level responsiveness. The significance of change for each participant was estimated as the individual-level responsiveness index, and the paired t test and test of marginal homogeneity were used for individual-level comparisons between the STREAM-27 and STREAM-15.ResultsAt the group level, the STREAM-30, STREAM-27, and STREAM-15 showed sufficient and comparable responsiveness. At the individual level, the STREAM-27 detected significantly more participants with significant improvement and fewer participants with no change or deterioration compared with the STREAM-15.LimitationsFew patients with subacute stroke showed deterioration at discharge, so the abilities of the 2 measures to detect deterioration remain inconclusive.ConclusionsThe STREAM-27 detected more participants with significant recovery compared with the STREAM-15, although the group-level responsiveness of the 2 measures was the same. The STREAM-27 is recommended as an outcome measure to demonstrate the treatment effects of movement and mobility for patients with stroke.

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