scholarly journals A comparison of hip adduction to abduction strength ratios, in the dominant and non-dominant limb, of elite academy football players

2015 ◽  
Vol 2 (1) ◽  
pp. 109 ◽  
Author(s):  
Victoria C. Griffin ◽  
Tony Everett ◽  
Ian G. Horsley
Keyword(s):  
Injury Risk ◽  
Football Players ◽  
Isokinetic Dynamometer ◽  
Treatment And Prevention ◽  
Risk Of Injury ◽  
Premier League ◽  
Left Limb ◽  
Baseline Values ◽  
English Premier League ◽  
Abduction Strength

Context: Hip adduction and abduction strength plays an important role in the treatment and prevention of groin injuries in football players. Currently there are no reliable baseline values for uninjured football player’s hip adduction: abduction muscle strength ratios. Objective: To examine whether normal hip adduction: abduction strength ratios can be established in uninjured football players.  To compare this data, and establish if there is an asymmetry between the dominant and non-dominant limb. Methods: Twenty, English Premier League academy football players 18.45 (± 2.06) years, 72.6 (± 5.56) kg, 180.15 (± 7.97) cm, 3 left limb dominant, and 17 right limb dominant were included in the study. Eccentric and concentric hip adduction and abduction strength of the dominant and non-dominant leg was tested using a Cybex isokinetic dynamometer. Results: The concentric ratio on the dominant limb was 1.59 (± 0.19) and on the non-dominant limb 1.45 (± 0.31).  The eccentric ratio on the dominant limb was 1.45 (± 0.32) and on the non-dominant limb 1.26 (± 0.26).  Overall the ratios were higher on the dominant limb and this was statistically significant P ≤ .05. Abduction strength was similar bilaterally.  Adduction strength was 18%-22% greater on the dominant limb. Conclusions: The greater ratios on the dominant limb are due to increased adductor strength as a result of the kicking action. Elite football player’s hip adduction: abduction strength ratios should be 1.45-1.6 on the dominant limb and 1.25-1.45 on the non-dominant limb. The adductors on the dominant limb should be 18%-22% stronger than the non-dominant limb. Ratios outside these parameters could indicate the player is at risk of injury. Further research is required to support muscle imbalance as a cause of injury and identify injury risk thresholds for groin injuries in football players. 

scholarly journals Spikes in acute:chronic workload ratio (ACWR) associated with a 5–7 times greater injury rate in English Premier League football players: a comprehensive 3-year study

2019 ◽  
Vol 54 (12) ◽  
pp. 731-738 ◽  
Author(s):  
Laura Bowen ◽  
Aleksander Stephan Gross ◽  
Mo Gimpel ◽  
Stewart Bruce-Low ◽  
Francois-Xavier Li
Keyword(s):  
Chronic Exposure ◽  
High Speed ◽  
Injury Risk ◽  
Injury Rate ◽  
Football Players ◽  
Low Intensity ◽  
Total Distance ◽  
Premier League ◽  
Z Scores ◽  
English Premier League

ObjectivesWe examined the relation between global positioning system (GPS)-derived workloads and injury in English Premier League football players (n=33) over three seasons.MethodsWorkload and injury data were collected over three consecutive seasons. Cumulative (1-weekly, 2-weekly, 3-weekly and 4-weekly) loads in addition to acute:chronic workload ratios (ACWR) (acute workload (1-week workload)) divided by chronic workload (previous 4-week average acute workload) were classified into discrete ranges by z-scores. Relative risk (RR) for each range was then calculated between injured and non-injured players using specific GPS variables: total distance, low-intensity distance, high-speed running distance, sprint distance, accelerations and decelerations.ResultsThe greatest non-contact injury risk was when the chronic exposure to decelerations was low (<1731) and the ACWR was >2.0 (RR=6.7). Non-contact injury risk was also 5–6 times higher for accelerations and low-intensity distance when the chronic workloads were categorised as low and the ACWR was >2.0 (RR=5.4–6.6), compared with ACWRs below this. When all chronic workloads were included, an ACWR >2.0 was associated with a significant but lesser injury risk for the same metrics, plus total distance (RR=3.7–3.9).ConclusionsWe recommend that practitioners involved in planning training for performance and injury prevention monitor the ACWR, increase chronic exposure to load and avoid spikes that approach or exceed 2.0.

scholarly journals Protection Against Spikes in Workload With Aerobic Fitness and Playing Experience: The Role of the Acute:Chronic Workload Ratio on Injury Risk in Elite Gaelic Football

2017 ◽  
Vol 12 (3) ◽  
pp. 393-401 ◽  
Author(s):  
Shane Malone ◽  
Mark Roe ◽  
Dominic A. Doran ◽  
Tim J. Gabbett ◽  
Kieran D. Collins
Keyword(s):  
Aerobic Fitness ◽  
Injury Risk ◽  
Perceived Exertion ◽  
Reference Group ◽  
Time Trial ◽  
Rating Of Perceived Exertion ◽  
Football Players ◽  
Risk Of Injury ◽  
Increased Risk ◽  
Injury Protection

Purpose:To examine the association between combined session rating of perceived exertion (RPE) workload measures and injury risk in elite Gaelic footballers.Methods:Thirty-seven elite Gaelic footballers (mean ± SD age 24.2 ± 2.9 y) from 1 elite squad were involved in a single-season study. Weekly workload (session RPE multiplied by duration) and all time-loss injuries (including subsequent-wk injuries) were recorded during the period. Rolling weekly sums and wk-to-wk changes in workload were measured, enabling the calculation of the acute:chronic workload ratio by dividing acute workload (ie, 1-weekly workload) by chronic workload (ie, rolling-average 4-weekly workload). Workload measures were then modeled against data for all injuries sustained using a logistic-regression model. Odds ratios (ORs) were reported against a reference group.Results:High 1-weekly workloads (≥2770 arbitrary units [AU], OR = 1.63–6.75) were associated with significantly higher risk of injury than in a low-training-load reference group (<1250 AU). When exposed to spikes in workload (acute:chronic workload ratio >1.5), players with 1 y experience had a higher risk of injury (OR = 2.22) and players with 2–3 (OR = 0.20) and 4–6 y (OR = 0.24) of experience had a lower risk of injury. Players with poorer aerobic fitness (estimated from a 1-km time trial) had a higher injury risk than those with higher aerobic fitness (OR = 1.50–2.50). An acute:chronic workload ratio of (≥2.0) demonstrated the greatest risk of injury.Conclusions:These findings highlight an increased risk of injury for elite Gaelic football players with high (>2.0) acute:chronic workload ratios and high weekly workloads. A high aerobic capacity and playing experience appears to offer injury protection against rapid changes in workload and high acute:chronic workload ratios. Moderate workloads, coupled with moderate to high changes in the acute:chronic workload ratio, appear to be protective for Gaelic football players.

Absolute and Relative Load and Injury in Elite Junior Australian Football Players Over 1 Season

2020 ◽  
Vol 15 (4) ◽  
pp. 511-519 ◽  
Author(s):  
Timothy J.H. Lathlean ◽  
Paul B. Gastin ◽  
Stuart V. Newstead ◽  
Caroline F. Finch
Keyword(s):  
Injury Risk ◽  
Perceived Exertion ◽  
Fold Increase ◽  
Estimating Equation ◽  
Rating Of Perceived Exertion ◽  
Football Players ◽  
Injury Surveillance System ◽  
Relative Load ◽  
Risk Of Injury ◽  
Australian Football

Purpose: To investigate the association between training and match loads and injury in elite junior Australian football players over 1 competitive season. Methods: Elite junior Australian football players (n = 290, age 17.7 [0.3] y, range 16–18 y) were recruited from the under-18 state league competition in Victoria to report load and injury information. One-week load (session rating of perceived exertion multiplied by duration) and all time-loss injuries were reported using an online sport-injury surveillance system. Absolute load measures (weekly sums) enabled the calculation of relative measures such as the acute:chronic workload ratio. Load measures were modeled against injury outcome (yes/no) using a generalized estimating equation approach, with a 1-wk lag for injury. Results: Low (<300 arbitrary units [au]) and high (>4650 au) 1-wk loads were associated with significantly higher risk of injury. Furthermore, low (<100 au) and high (>850 au) session loads were associated with a higher risk of injury. High strain values (>13,000) were associated with up to a 5-fold increase in the odds of injury. There was a relatively flat-line association between the acute:chronic workload ratio and injury. Conclusions: This study is the first investigation of elite junior athletes demonstrating linear and nonlinear relationships between absolute and relative load measures and injury. Coaches should focus player loads on, or at least close to, the point at which injury risk starts to increase again (2214 au for 1-wk load and 458 au for session load) and use evidence-based strategies across the week and month to help reduce the risk of injury.

An evaluation of the presentation and severity of Australian football injury in children

Trauma ◽  
2020 ◽  
pp. 146040862094133
Author(s):  
Leopold Simma ◽  
Cameron S Palmer ◽  
Alan Ngo ◽  
Helen E Jowett ◽  
Warwick J Teague
Keyword(s):  
Injury Risk ◽  
Football Players ◽  
Psychosocial Wellbeing ◽  
Risk Of Injury ◽  
Trauma Service ◽  
Australian Rules Football ◽  
High Participation ◽  
Australian Football ◽  
Active Research ◽  
Substantial Morbidity

Introduction Child participation in sport is important for physical, cognitive and psychosocial wellbeing. Australian rules football has high participation, but also carries a high risk of injury due to the contact nature of the sport. This study aimed to evaluate changes in the presentation and hospital admission of paediatric Australian rules football-related injuries, and to compare the severity of these injuries with those from other team ball sports. Materials and methods At an Australian paediatric major trauma service, ED and hospital trauma registry data relating to Australian rules football injury between 2009 and 2015 were obtained. Data from other common team ball sports with a shared field of play were also identified. Results During the study period, there were 10,003 ED presentations, and 1110 admissions resulting from team ball sports. With 4751 ED presentations and 616 admissions, Australian rules football accounted for almost one-third of all sports-related presentations and admissions, and around half of the team ball sports cohort. Compared to other team ball sports patients, Australian rules football-related patients were 40% more likely to be admitted, and nearly twice as likely to be classified as severe injury. Australian rules football players presented with different injury patterns were compared to other team ball sports players; admitted players were significantly more likely to have sustained head or neck injuries, and were more than twice as likely to sustain truncal injury. Conclusions Australian rules football is a common cause of ED presentations and results in substantial morbidity, both overall and when compared with other team ball sports. Australian rules football should remain a focus for ongoing and active research into strategies which reduce injury risk.

Functional Movement Screen (FMS™) score does not predict injury in English Premier League youth academy football players

2017 ◽  
Vol 1 (2) ◽  
pp. 102-106 ◽  
Author(s):  
Florence Newton ◽  
Alan McCall ◽  
Desmond Ryan ◽  
Colin Blackburne ◽  
Karen aus der Fünten ◽  
...  
Keyword(s):  
Football Players ◽  
Functional Movement Screen ◽  
Functional Movement ◽  
Premier League ◽  
English Premier League

The Football Team Composition Problem: a Stochastic Programming approach

2017 ◽  
Vol 13 (3) ◽  
pp. 113-129 ◽  
Author(s):  
Giovanni Pantuso
Keyword(s):  
Programming Approach ◽  
Football Players ◽  
Steady Growth ◽  
Premier League ◽  
Football Team ◽  
Composition Problem ◽  
Football Clubs ◽  
European Football ◽  
English Premier League

Abstract Most professional European football clubs are well-structured businesses. Therefore, the financial performance of investments in players becomes crucial. In this paper, after the problem is discussed and formalized, an optimization model with the objective of maximizing the expected value of the team is presented. The model ensures that the team has the required mix of skills, that competition regulations are met, and that budget limits are respected. The model explicitly takes into account the uncertainty in the career development of football players. A case study based on the English Premier League is presented. Our results show that the model has significant potential to improve current decisions ensuring a steady growth of the value of the team. The team value growth reported is particularly driven by investments in young prospects.

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