Monitoring Accelerations With GPS in Football: Time to Slow Down?

2014 ◽  
Vol 9 (3) ◽  
pp. 442-445 ◽  
Author(s):  
Martin Buchheit ◽  
Hani Al Haddad ◽  
Ben M. Simpson ◽  
Dino Palazzi ◽  
Pitre C. Bourdon ◽  
...  
Keyword(s):  
Football Players ◽  
Gps Data ◽  
Professional Football ◽  
Confidence Limits ◽  
Custom Made ◽  
Before And After ◽  
Maximal Speed ◽  
Software Updates ◽  
Peak Speed ◽  
Simulated Match

The aims of the current study were to examine the magnitude of between-GPS-models differences in commonly reported running-based measures in football, examine between-units variability, and assess the effect of software updates on these measures. Fifty identical-brand GPS units (15 SPI-proX and 35 SPIproX2, 15 Hz, GPSports, Canberra, Australia) were attached to a custom-made plastic sled towed by a player performing simulated match running activities. GPS data collected during training sessions over 4 wk from 4 professional football players (N = 53 files) were also analyzed before and after 2 manufacturersupplied software updates. There were substantial differences between the different models (eg, standardized difference for the number of acceleration >4 m/s2 = 2.1; 90% confidence limits [1.4, 2.7], with 100% chance of a true difference). Between-units variations ranged from 1% (maximal speed) to 56% (number of deceleration >4 m/s2). Some GPS units measured 2–6 times more acceleration/deceleration occurrences than others. Software updates did not substantially affect the distance covered at different speeds or peak speed reached, but 1 of the updates led to large and small decreases in the occurrence of accelerations (–1.24; –1.32, –1.15) and decelerations (–0.45; –0.48, –0.41), respectively. Practitioners are advised to apply care when comparing data collected with different models or units or when updating their software. The metrics of accelerations and decelerations show the most variability in GPS monitoring and must be interpreted cautiously.

scholarly journals Peak Speeds of Professional Football Players During Bouts of Non-curved, Manual Treadmill Sprints

2021 ◽  
Author(s):  
Corey Peacock ◽  
Jacob Peacock ◽  
Jose Antonio ◽  
Tobin Silver ◽  
Gabriel Sanders
Keyword(s):  
Short Distance ◽  
Football Players ◽  
Professional Football ◽  
Biomechanical Stress ◽  
Paired Samples ◽  
Current Trends ◽  
Significant Difference ◽  
Speed Training ◽  
Peak Speed ◽  
Speed Response

Purpose: Speed training and short distance sprints have become an essential component of preparation for professional football players. Current trends in speed training have included the application of non-curved, manual treadmills, as they may enhance peak speeds with less biomechanical stress. A lack of data currently exists in regards to the effectiveness of different settings and peak speed response. Therefore, we proposed to compare peak speeds during different settings of non-curved, manual treadmills. It was hypothesized that as resistance/incline increased, peak sprinting speeds would decrease and vice versa. Methods: Fourteen male professional football players (27.14 ± 3.11 yrs., 183.93 ± 8.52 cm, 100.36 ± 15.60 kg) sprinted at peak speeds during four different incline/resistance bouts. Paired samples T-tests examined differences between bouts, and significance was set at p ≤ 0.008. Results: A significant difference (p < 0.001) existed for peak speeds between each incline/resistance bout (i.e. INC15R8, INC15R5, INC20R3, INC20R1). Conclusions: The observed data differences existed between all bouts, indicating that as resistance and/or incline increased, peak speed decreased. This also indicated that as resistance and/or incline decreased, peak speed increased during sprint bouts in professional football players.

Effect of Concussions on the Performance of Running Backs and Wide Receivers in the National Football League

2019 ◽  
Vol 47 (11) ◽  
pp. 2717-2722 ◽  
Author(s):  
Toufic R. Jildeh ◽  
Kelechi R. Okoroha ◽  
Kevin A. Taylor ◽  
Patrick Buckley ◽  
Samir Mehta ◽  
...  
Keyword(s):  
National Football League ◽  
Individual Performance ◽  
High Rate ◽  
Return To Play ◽  
Control Group ◽  
Football Players ◽  
Professional Football ◽  
Significant Difference ◽  
Before And After ◽  
Player Performance

Background: Concussion injuries are common in professional football players; however, their effect on player performance remains unclear. Purpose: To quantify the effect of concussions on the performance of running backs and wide receivers in professional football players. Study Design: Cohort study; Level of evidence, 3. Methods: Concussion data from the National Football League were collected for a period of 4 seasons (2012-2015) for running backs and wide receivers. Age, experience, position, time to return to play, yearly total yards, and touchdowns were recorded. A power rating (total yards divided by 10 plus touchdowns multiplied by 6) was calculated for each player’s injury season as well as for the 3 seasons before and after their respective injury. A control group of running backs and wide receivers without an identified concussion injury who competed in the 2012 season was assembled for comparison. Player performance up to 3 seasons before and after the injury season was examined to assess acute and longitudinal changes in player performance. Results: A total of 38 eligible running backs and wide receivers sustained a concussion during the study period. Thirty-four (89%) players were able to return to competition in the same season, missing an average of 1.5 ± 0.9 games; the remaining 4 players returned in the subsequent season. Power ratings for concussed players were similar to those of controls throughout the study period. Concussed players did not suffer an individual performance decline upon returning within the same season. Furthermore, no significant difference in change of power rating was observed in concussed players in the acute (±1 year from injury; −1.2 ± 4.8 vs –1.1 ± 3.9, P = .199) or chronic (±3 years from injury; –3.6 ± 8.0 vs –3.0 ± 4.5, P = .219) setting compared with controls. All concussed players successfully returned to competition in either the index or next season. Conclusion: A high rate of National Football League running backs and wide receivers are able to return to play after a concussion injury. These players were found to perform at a similar level in both the acute and long-term period after concussion.

EFFECTIVENESS OF TWO SHORT DURATION (4 WEEK & 6 WEEK) PLYOMETRIC TRAINING ON AGILITY PERFORMANCE IN SEMI - PROFESSIONAL FOOTBALL PLAYERS (A COMPARATIVE STUDY)

2021 ◽  
pp. 53-55
Author(s):  
Abraar Siddiqui ◽  
Manali Desai (PT) ◽  
Mayuri Ghumatkar (PT) ◽  
Ajay Kumar (PT)
Keyword(s):  
Short Duration ◽  
Professional Training ◽  
Training Programs ◽  
Football Players ◽  
Professional Football ◽  
Plyometric Training ◽  
Short Term ◽  
Intergroup Comparison ◽  
Before And After ◽  
And Control

Background: Plyometric training (PT) has been shown to improve agility among sports which require aerobic endurance. Semi-professional football players need a short-term training program which will improve their performance in competitive matches even due to time constraint or lack of professional training. The study aims to identify effectiveness of two short duration program 4 week or 6-week plyometric training on agility in semi-professional football players. Method: In this comparative experimental study, 45 semi-professional football players were selected and randomly divided into three groups. One group underwent 4 weeks of plyometric training, other group 6 weeks of plyometric training and control was third group. All the participants performed Agility T test before and after completion of training. Result: Data was recorded and used for statistical analysis. There was statistically signicant difference between pre (15.05 + 0.81) seconds and post (14.8 + 0.58) seconds values after 4- weeks of Plyometric training & pre (15.05 + 0.81) seconds and post (14.4 + 0.70) seconds values after 6- weeks of plyometric training. Intergroup comparison between all three groups showed no difference between 4 weeks and 6 weeks of plyometric training. (p>0.05) Conclusion: Thus, our study shows that both the short-term training programs are equally effective in improving agility among semi – professional football players.

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.

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 Influence of the artificial turf certification on physical performance and muscle damage in football players (QUALTURF PROJECT)

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Javier Sanchez-Sanchez ◽  
Jose Luis Felipe ◽  
Antonio Hernandez-Martin ◽  
David Viejo-Romero ◽  
Vicente Javier Clemente-Suarez ◽  
...  
Keyword(s):  
Muscle Damage ◽  
Football Players ◽  
Artificial Turf ◽  
Post Exercise ◽  
Perceived Effort ◽  
Risk Of Injury ◽  
Football Team ◽  
Randomized Design ◽  
Exercise Muscle ◽  
Simulated Match

AbstractThis study aimed to analyse the influence of the FIFA Quality PRO certification of artificial turf pitches on the physical, physiological performance and muscle damage in soccer players. Fifteen healthy male players (21.2 ± 1.4 years; 178.2 ± 4.3 cm; 79.1 ± 8.3 kg) from a university football team were selected to participate in the research. Mechanical properties related to surface–player interaction were assessed on the two surfaces selected for this study. A randomized design was used and the players performed the Ball-sport Endurance and Sprint Test (BEAST90) on the different artificial turf fields. Average time of the 20 m sprints was longer on the FIFA Quality Pro surface than on the non-certified pitch (+ 0.13 s; p < 0.05; CI 95% − 0.01 to 0.27; ES: 0.305). The players’ perceived effort was higher in the first (+ 2.64; p < 0.05; CI 95% 0.92 to 4.35; ES: 1.421) and the second half (+ 1.35; p < 0.05; CI 95% − 0.02 to 2.72; ES: 0.637) of the test on the FIFA Quality Pro field. Comparative analysis between surfaces showed no significant differences in the time spent in each of the heart rate zones and higher concentrations of CK (+ 196.58; p > 0.05; CI 95% 66.54 to 326.61; ES: 1.645) were evidenced in the non-certified pitch surface. In response to a simulated match protocol, markers of post-exercise muscle damage may be reduced on accredited artificial turf fields. These insights can provide the opportunity to maximize the efficiency of training sessions and reduce the risk of injury during the season.

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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