scholarly journals Analyse Success Model of Split Time and Cut-Off Point Values of Physical Demands to Keep Category in Semi-Professional Football Players

2020 ◽  
Vol 10 (15) ◽  
pp. 5299
Author(s):  
Jesus Vicente Gimenez ◽  
Luis Jimenez-Linares ◽  
Jorge Garcia-Unanue ◽  
Javier Sanchez-Sanchez ◽  
Leonor Gallardo ◽  
...  
Keyword(s):  
High Intensity ◽  
Ad Hoc ◽  
Controlled Study ◽  
Football Players ◽  
Professional Football ◽  
Physical Demands ◽  
Situational Variable ◽  
Success Model ◽  
Gps Devices ◽  
Split Time

The aim of this study was to analyse different success models and split time on cut-off point values on physical demands to keep category in semi-professional football players. An ad hoc observational controlled study was carried out with a total of ten (840 match data) outfield main players (25.2 ± 6.3 years, 1.79 ± 0.75 m, 74.9 ± 5.8 kg and 16.5 ± 6 years of football experience) and monitored using 15 Hz GPS devices. During 14 official matches from the Spanish division B in the 2016/2017 season, match data were coded considering the situational variable (score) and classified by match results (winning, losing or drawing). The results show significant differences between high-intensity attributes criteria that considered split time in velocity zones of 0–15 min (p = 0.043, ηp2 = 0.065, medium), 30–45 min (p = 0.010, ηp2 = 0.094, medium) and 60–75 min (p = 0.015, ηp2 = 0.086, medium), as well as sprint 60–75 min (p = 0.042, ηp2 = 0.066, medium) and 75–90 min (p = 0.002, ηp2 = 0.129, medium). Decision tree induction was applied to reduce the disparity range of data according to six 15-min intervals and to determine the cut-off point values for every parameter combination. It was possible to establish multivariate models for the main high-intensity actions criteria, allowing the establishment of all rules with their attributes and enabling the detection and visualisation of relationships and the pattern sets of variables for determining success.

scholarly journals Análisis de variables condicionales y técnico-tácticas mediante juegos reducidos en futbolistas semiprofesionales (Analysis of physical and technical-tactical demands through small-sided games in semi-professional football players)

Retos ◽  
2018 ◽  
pp. 87-90
Author(s):  
Víctor Torreblanca-Martínez ◽  
Rubén Cordero-Ojeda ◽  
José Antonio González-Jurado
Keyword(s):  
High Intensity ◽  
Repeated Measures ◽  
Football Players ◽  
Professional Football ◽  
Physical Domain ◽  
Total Distance ◽  
Physical Variables

Objetivo: Analizar el rendimiento en variables condicionales y técnico-tácticas en función del número de contactos permitidos en juegos reducidos en futbolistas semiprofesionales. Métodos: Ocho jugadores semiprofesionales de fútbol (21,1 ± 1,5 años; 174,7 ± 3,5 cm; 71,3 ± 4,7 kg) fueron sometidos a situaciones juego reducidos 4x4, con uno (JR1T), dos (JR2T) y tres contactos al balón (JR3T) y sin portero. Las variables condicionales medidas fueron las distancias totales recorridas (DTR), distancias a alta intensidad (DAI) y distancias a sprint (DS), y las variables técnico-tácticas evaluadas fueron el número de pases acertados (PA), los balones perdidos (BP) y el porcentaje de pases acertados (%PA). Para las comparaciones entre formatos de JR se aplicó ANOVA de medidas repetidas y para las correlaciones entre variables se calculó la r de Pearson. Resultados: Se registraron mayores valores (p < 0,05) en DTR en los JR1T (1132,7 ± 61,3) con respecto a los JR3T (1059,1 ± 88,3), así como en los JR2T (1165,7 ± 60,4) con respecto a los JR3T. La DAI y la DS es mayor (p < 0,05) en los JR2T (DAI: 145,63 ± 37; DS: 12,88 ± 7,1) que en los JR3T (DAI: 99,1 ± 33,2; DS: 5,75 ± 5,6). En cuanto a las variables técnico-tácticas, en los JR1T los PA (36,3 ± 6,4) y los BP (28 ± 4,2) fueron más numerosos (p <0,05) que en los JR2T (PA: 26,9 ± 12,2; BP: 14 ± 1,51) y en JR3T (PA: 23,8 ± 3,4; BP: 12,1 ± 2,7). El %PA fue menor (p < 0,05) en los JR1T (56,18 ± 7,82) con respecto a los JR3T (66,21 ± 7,94). Conclusiones: A nivel físico, la DTR en los JR1T fue mayor que en los JR2T y en JR3T, siendo la DAI y la DS menor en los JR3T con respecto a los JR2T. A nivel técnico-táctico, la situación de JR1T mostró más PA y menos BP que las situaciones JR2T y JR3T, siendo el %PA menor en JR1T con respecto a JR3T.Abstract. Aim: Analyzing physical and technical-tactical performance based on the number of authorized ball touches in small-sided games in semi-professional football players. Methods: Eight semi-professional football players (21,1 ± 1,5 years; 174,7 ± 3,5 cm; 71,3 ± 4,7 kg) performed 4x4 small-sided games with one touch (SG1T), two touches (SG2T) and three touches of the ball authorized (SG3T), without goalkeeper. Physical variables measured were total distance (TD), high intensity distance (HID) and sprint distance (SD). The tactical/technical variables included were number of successful passes (SP), ball losses (BL), and percentage of successful passes (%SP). Small-sided games were compared with an ANOVA of repeated measures and Pearson r was used to establish correlation between variables. Results: regarding the physical variables, higher values (p < 0,05) were obtained for TD in SG1T (1132,7 ± 61,3) compared to SG3T (1059,1 ± 88,3), and in SG2T (1165,7 ± 60,4) compared to SG3T. HID and SD values were higher (p < 0,05) in SG2T (HID: 145,63 ± 37; SD: 12,88 ± 7,1) than in SG3T (HID: 99,1 ± 33,2; SD: 5,75 ± 5,6). In the tactical/technical variables, SP (36,3 ± 6,4) and BL (28 ± 4,2) were higher in SG1T (p < 0,05) than in SG2T (SP: 26,9 ± 12,2; BL: 14 ± 1,51) and in SG3T (SP: 23,8 ± 3,4; BL: 12,1 ± 2,7). The %SP was smaller (p < 0,05) in SG1T (56,18 ± 7,82) than in SG3T (66,21 ± 7,94). Conclusions: In the physical domain, TD in SG1T was higher than in SG2T and SG3T, being HID and SD smaller in SG3T with respect to SG2T. At the technical-tactical level, SG1T situations showed more SP and less BL than SG2T and SG3T, being the %SP smaller in SG1T than in SG2T.

scholarly journals Radiographic changes in the lumbar spine in former professional football players: a comparative and matched controlled study

2007 ◽  
Vol 17 (1) ◽  
pp. 136-141 ◽  
Author(s):  
Alpaslan Öztürk ◽  
Yüksel Özkan ◽  
Recai M. Özdemir ◽  
Nazan Yalçın ◽  
Semra Akgöz ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Controlled Study ◽  
Football Players ◽  
Professional Football ◽  
Radiographic Changes

scholarly journals The Effect of the COVID-19 Lockdown on the Position-Specific Match Running Performance of Professional Football Players; Preliminary Observational Study

2021 ◽  
Vol 18 (22) ◽  
pp. 12221
Author(s):  
Damir Sekulic ◽  
Sime Versic ◽  
Andrew Decelis ◽  
Jose Castro-Piñero ◽  
Dejan Javorac ◽  
...  
Keyword(s):  
Physical Performance ◽  
High Intensity ◽  
Effect Sizes ◽  
Football Players ◽  
Professional Football ◽  
Running Performance ◽  
Low Intensity ◽  
Before And After ◽  
National Competition ◽  
Physical Performances

The COVID-19 pandemic interrupted professional football in the 2019/2020 season, and football experts anticipate that the consequences of lockdown measures will negatively affect the physical performance of players once competition restarts. This study aimed to evaluate position-specific match running performance (MRP) to determine the effect of COVID-19 lockdowns on the physical performance of professional football players. Players’ MRPs (n = 124) were observed in matches before and after the COVID-19 lockdown in the 2019/2020 season of the highest level of national competition in Croatia and were classified according to player position: central defenders (CD; n = 42), fullbacks (FB; n = 20), midfielders (MF; n = 46), and forwards (FW; n = 16). The MRPs were measured using Global Positioning System, and included the total distance covered, low-intensity running (≤14.3 km/h), running (14.4–19.7 km/h), high-intensity running (≥19.8 km/h), total accelerations (>0.5 m/s2), high-intensity accelerations (>3 m/s2), total decelerations (less than –0.5 m/s2), and high-intensity decelerations (less than –3 m/s2). The results indicated that, in matches after the COVID-19 lockdown, (i) CDs and FBs featured lower running and high-intensity running (t-value: from 2.05 to 3.51; all p < 0.05; moderate to large effect sizes), (ii) MFs covered a greater distance in low-intensity running and achieved a lower number of total accelerations, and total and high-intensity decelerations (t-value: from –3.54 to 2.46; all p < 0.05, moderate to large effect sizes), and (iii) FWs featured lower high-intensity running (t-value = 2.66, p = 0.02, large effect size). These findings demonstrate that the physical performances of football players from the Croatian first division significantly decreased in matches after the COVID-19 lockdown. A combination of inadequate adaptation to football-specific match demands and a crowded schedule after the competition was restarted most likely resulted in such an effect.

scholarly journals Position Specific Running Performances in Professional Football (Soccer): Influence of Different Tactical Formations

Sports ◽  
2020 ◽  
Vol 8 (12) ◽  
pp. 161
Author(s):  
Toni Modric ◽  
Sime Versic ◽  
Damir Sekulic
Keyword(s):  
Body Mass ◽  
Analysis Of Variance ◽  
Global Positioning System ◽  
High Intensity ◽  
Training Programs ◽  
Body Height ◽  
Football Players ◽  
Positioning System ◽  
Professional Football ◽  
Global Positioning

Running performances (RPs) are known to be important parameters of success in football (soccer), but there is a lack of studies where RPs are contextualized regarding applied tactical solutions. This study aims to quantify and analyze the differences in position-specific RPs in professional football, when games are played with three defensive players (3DP) and four defensive players (4DP). The participants here include professional football players (M ± SD, age 23.57 ± 2.84 years, body height 181.9 ± 5.17 cm, body mass 78.36 ± 4.18 kg) playing at the highest competitive level in Croatia. RPs were measured by global positioning system and classified into four groups based on playing positions: central defenders (CD; n = 47), wide defenders (WD; n = 24), midfielders (MF; n = 48), or forwards (FW; n = 19). Analysis of variance and discriminant canonical analysis are used to identify differences between 3DP and 4DP tactical solutions in terms of the RPs for each playing position. The number of accelerations and decelerations most significantly contributed to the differentiation of 3DP and 4DP among MFs (Wilks λ = 0.31, p < 0.001), with higher occurrences with 3DP. For CDs, total distance, and high-intensity running were higher in 3DP (Wilks λ = 0.66, p < 0.001). No multivariate differences were found for FW and WD players in terms of the RPs between 3DP and 4DP tactical formations. The characteristics and differences shown in this study may provide useful information for coaching staff regarding changing in-season tactical formations. Additionally, the results are useful for optimizing training programs for football players with different playing positions. When changing from 4DP to 3DP tactical formations, WDs training programs should include more of high-intensity running, while MFs training programs should be more based on short intensity activities (accelerations and decelerations).

Post-match recovery of eccentric knee flexor strength in male professional football players

2021 ◽  
Vol 47 ◽  
pp. 140-146
Author(s):  
César Augusto Bueno ◽  
João Breno de Araujo Ribeiro-Alvares ◽  
Gabriel dos Santos Oliveira ◽  
Rafael Grazioli ◽  
Filipe Veeck ◽  
...  
Keyword(s):  
Football Players ◽  
Professional Football ◽  
Knee Flexor ◽  
Flexor Strength

Lunate and Perilunate Dislocations in Professional Football Players

1994 ◽  
Vol 22 (6) ◽  
pp. 841-845 ◽  
Author(s):  
David J. Raab ◽  
David A. Fischer ◽  
Donald C. Quick
Keyword(s):  
Football Players ◽  
Professional Football

scholarly journals Anterior Cruciate Ligament Injury Prevention Exercises: Could a Neuromuscular Warm-Up Improve Muscle Pre-Activation before a Soccer Game? A Proof-of-Principle Study on Professional Football Players

2021 ◽  
Vol 11 (11) ◽  
pp. 4958
Author(s):  
Alessandro de Sire ◽  
Andrea Demeco ◽  
Nicola Marotta ◽  
Lucrezia Moggio ◽  
Arrigo Palumbo ◽  
...  
Keyword(s):  
Anterior Cruciate Ligament ◽  
Cruciate Ligament ◽  
Acl Injury ◽  
Football Players ◽  
Professional Football ◽  
Activation Time ◽  
Exercise Protocol ◽  
Warm Up ◽  
Anterior Cruciate ◽  
Proof Of Principle

Neuromuscular warm-up has been shown to decrease the risk of anterior cruciate ligament (ACL) injury improving muscular firing patterns. All preventive training programs described in the literature have a duration of several weeks. To date, no studies have explored the immediate effect of a neuromuscular warm-up exercise on pre-activation time of the knee stabilizer muscles. Thus, this proof-of-principle study aimed at evaluating the acute effects of a neuromuscular warm-up exercises on the electromyographic activation of knee stabilizer muscles’ activation pattern. We included 11 professional football players, mean aged 23.2 ± 4.5 years, from a Southern Italy football team. All of them underwent a standard warm-up exercise protocol at the first day of the evaluation. At 1 week, they underwent a structured neuromuscular warm-up exercise protocol. We assessed as outcome measure the pre-activation time (ms) of rectus femoris (RF), vastus medialis (VM), biceps femoris (BF), and medial hamstrings (MH) upon landing. Outcomes were assessed before and after the standard warm-up and neuromuscular warm-up. Pre-activation time of RF, VM, BF and MH significantly improved only after neuromuscular warm-up (p < 0.05); moreover, there was a significant (p < 0.05) between-group difference in pre-activation time of all muscles after the neuromuscular warm-up compared with the standard warm-up. These findings suggested that physical exercise consisting of a structured injury prevention neuromuscular warm-up might have an immediate effect in improving the activation time of the knee stabilizer muscles, thus potentially reducing the risk of ACL injury.

scholarly journals Resuming professional football (soccer) during the COVID-19 pandemic in a country with high infection rates: a prospective cohort study

2021 ◽  
pp. bjsports-2020-103724
Author(s):  
Yorck Olaf Schumacher ◽  
Montassar Tabben ◽  
Khalid Hassoun ◽  
Asmaa Al Marwani ◽  
Ibrahim Al Hussein ◽  
...  
Keyword(s):  
Cohort Study ◽  
Prospective Cohort Study ◽  
Prospective Cohort ◽  
Preventive Measures ◽  
Clinical Symptoms ◽  
Severe Illness ◽  
Football Players ◽  
Professional Football ◽  
Infection Rates ◽  
High Infection

ObjectivesThe risk of viral transmission associated with contact sports such as football (soccer) during the COVID-19 pandemic is unknown. The aim of this study was to describe the infective and immune status of professional football players, team staff and league officials over a truncated football season resumed at the height of the COVID-19 pandemic in a country with high infection rates and to investigate the clinical symptoms related to COVID-19 infection in professional football players.MethodsProspective cohort study of 1337 football players, staff and officials during a truncated football season (9 weeks) with a tailored infection control programme based on preventive measures and regular SARS-CoV-2 PCR swab testing (every 3–5 days) combined with serology testing for immunity (every 4 weeks). Clinical symptoms in positive participants were recorded using a 26-item, Likert-Scale-based scoring system.ResultsDuring the study period, 85 subjects returned positive (cycle threshold (cT) ≤30) or reactive (30<cT<40) PCR tests, of which 36 were players. The infection rate was consistent with that of the general population during the same time period. More than half of infected subjects were asymptomatic, and the remaining had only mild symptoms with no one requiring hospitalisation. Symptom severity was associated with lower cT values. Social contacts and family were the most common sources of infection, and no infection could be traced to training or matches. Of the 36 infected players, 15 presented positive serology during the study period.ConclusionFootball played outdoors involving close contact between athletes represents a limited risk for SARS-CoV-2 infection and severe illness when preventive measures are in place.

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