Harmful association of sprinting with muscle injury occurrence in professional soccer match-play: A two-season, league wide exploratory investigation from the Qatar Stars League

Objectives: To investigate the impact of physical efforts performed in the period preceding activity as a potential risk factor of muscle injury during match-play within a sample of professional soccer players. Design: Observational cohort study. Methods: Match load (running [>14.4–19.8 km/h], high-speed running [>19.8–25.2 km/h], sprinting [>25.2 km/h], leading and explosive sprint type) averaged in 1-min and 5-min periods prior to an event or non event for 29 professional outfield soccer players. Conditional logistic and Poisson regression models estimated the relationship between load and injury for a 2 within-subject standard deviation in match load or 1-action increment in the number of sprinting activities, respectively. Associations were deemed beneficial or harmful based on non-overlap of the 95% confidence intervals against thresholds of 0.90 and 1.11, respectively. Results: An increment in sprinting distance [+2-SDs = 11 m] covered over a 1-min period (odds ratio [OR]: 1.22, 95%CI, 1.12 to 1.33) increased the odds of muscle injury. Conclusions: Our study provides novel exploratory evidence that the volume of sprinting during competitive soccer match-play has a harmful association with muscle injury occurrence

Injury risk and patterns in newly transferred football players: A case study of 8 seasons from a professional football club

This case study investigated injury risk and patterns in players newly transferred to a professional football club. Time-loss injuries were recorded prospectively over 8-seasons (2008-2015). Injury incidence overall, in match and training, and patterns (contact, non-contact, sprain, strain, overuse and re-injury) were compared in transferred players (n=25) across their first versus second seasons and with those in players currently at the club at the moment of the transfer (n=55 individual players, 134 in total). Incidence Rate Ratios [IRR] in transferred players in their first versus second competitive season ranged from a 0.9 lower risk in training to a 1.5 higher risk of sustaining a contact injury (respective p values: 0.74, 0.19, inferences: unclear, likely harmful) in the first season. IRR for transferred players in their first and second seasons compared to rates in the same seasons in current players ranged from a 0.5 lower risk of incurring an overuse injury to a 1.1 higher risk of match injury (respective p values: 0.18, 0.89, inferences: unclear, possibly harmful), both occurring in season 1. For the between season and group comparisons, effect sizes regarding mean injury layoff time and matches missed ranged from trivial to small (0.03-0.22). Although limited to one club, these findings are positive as generally there was no meaningful increase in injury risk or burden in newly transferred players. Potential explanations include systematic pre-participation screening and injury prevention protocols and player rotation strategies in place at the club

Italian consensus conference on guidelines for conservative treatment on lower limb muscle injuries in athlete.

Provide the state of the art concerning (1) biology and aetiology, (2) classification, (3) clinical assessment and (4) conservative treatment of lower limb muscle injuries (MI) in athletes. Seventy international experts with different medical backgrounds participated in the consensus conference. They discussed and approved a consensus composed of four sections which are presented in these documents. This paper represents a synthesis of the consensus conference, the following four sections are discussed: (i) The biology and aetiology of MIs. A definition of MI was formulated and some key points concerning physiology and pathogenesis of MIs were discussed. (ii) The MI classification. A classification of MIs was proposed. (iii) The MI clinical assessment, in which were discussed anamnesis, inspection and clinical examination and are provided the relative guidelines. (iv) The MI conservative treatment, in which are provided the guidelines for conservative treatment based on the severity of the lesion. Furthermore, instrumental therapy and pharmacological treatment were discussed. Knowledge of the aetiology and biology of MIs is an essential prerequisite in order to plan and conduct a rehabilitation plan. Another important aspect is the use of a rational MI classification on prognostic values. We propose a classification based on radiological investigations performed by ultrasonography and MRI strongly linked to prognostic factors. Furthermore, the consensus conference results will able to provide fundamental guidelines for diagnostic and rehabilitation practice, also considering instrumental therapy and pharmacological treatment of MI. Expert opinion, level IV

Italian consensus conference on guidelines for conservative treatment on lower limb muscle injuries in athlete

Provide the state of the art concerning (1) biology and aetiology, (2) classification, (3) clinical assessment and (4) conservative treatment of lower limb muscle injuries (MI) in athletes. Seventy international experts with different medical backgrounds participated in the consensus conference. They discussed and approved a consensus composed of four sections which are presented in these documents. This paper represents a synthesis of the consensus conference, the following four sections are discussed: (i) The biology and aetiology of MIs. A definition of MI was formulated and some key points concerning physiology and pathogenesis of MIs were discussed. (ii) The MI classification. A classification of MIs was proposed. (iii) The MI clinical assessment, in which were discussed anamnesis, inspection and clinical examination and are provided the relative guidelines. (iv) The MI conservative treatment, in which are provided the guidelines for conservative treatment based on the severity of the lesion. Furthermore, instrumental therapy and pharmacological treatment were discussed. Knowledge of the aetiology and biology of MIs is an essential prerequisite in order to plan and conduct a rehabilitation plan. Another important aspect is the use of a rational MI classification on prognostic values. We propose a classification based on radiological investigations performed by ultrasonography and MRI strongly linked to prognostic factors. Furthermore, the consensus conference results will able to provide fundamental guidelines for diagnostic and rehabilitation practice, also considering instrumental therapy and pharmacological treatment of MI. Expert opinion, level IV

Performance profile in elite Italian football players

In recent decades, technology related to motion tracking in soccer has developed markedly and it is actually used to analyze soccer performance. We investigate a top-level Italian football season during home league matches for the season 2003-04 through a vision based tracking system (Digital Stadium) and data has been subsequently analyzed by the software “Physical Analysis” with the purpose of defining a performance profile in according with the position on the field. All distances covered at different speed by each player have been recorded and analyzed. Our findings confirmed previous researches stating that position on the field is a significant factor in determining performance profile in soccer. No difference among first and second half has been found in distance covered at all speed. Different profiles, in according with position on the field, have been identified: midfielder performance is characterized by high distance covered at low-medium intensity, elevate number of sprint for short distances, recoveries for short period of time; strikers are mainly covering long distances at high speed intensity, trough sprinting for medium-long distances and consistent recovery intervals; defenders model of performance is in between the profiles of strikers and midfielders, with long distance covered at low intensity speed alternate with long sprints and recoveries

Cryotherapy associated common peroneal nerve lesion in a soccer player,

Si descrive il percorso di recupero di un calciatore a seguito della lesione del nervo comune peroneal