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1 October, 2020

A new tool to control muscle load in football players

Health and Wellness
Sports Performance

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Professional football players have some particular physiological characteristics which allow them to run an average of 10-12 km per match as well as reaching speeds above 30 km/h. This makes those muscle groups with higher involvement in acceleration and deceleration scenarios (such as the hamstrings) be more susceptible to injury (they represent 12-16 % of total injuries).

One of the reasons why this area is more sensitive to getting injured could be related to the composition of its muscle fibres. The hamstrings have a high proportion of type II fibres, also called fast fibres,1 and due to structural and metabolic differences with respect to type I fibres, make them more vulnerable to damage from mechanical stress.2 That’s why if we know how these types of muscle fibre respond to workload, it could help prevent injuries.

Traditional blood tests which measure biomarkers, such as creatine kinase (CK), relate muscle response (specifically, muscle damage) to training load in football players,3 but the information it provides is limited and its reading does not differentiate between the types of fibre. A new study performed by researchers from the University of Barcelona,4 has shown how the concentration of fast and slow isoforms of myosin in blood could be a reliable marker for exercise-induced muscle damage, as well as being capable to differentiate by fibre type. Following this study, fast myosin isoform would be a characteristic of type II fibres, while the slow ones are type I fibres. Carmona et al. have seen that after an exercise with a high eccentric component, performed with an isoinertial device, the levels of fast myosin increase, while in endurance sports, such as an ultra-marathon, the levels of slow isoform increase; thus, this technique can distinguish between types of fibres and sports specialisation.5,6

It is well worth to highlight that isoform analysis can be sensitive when detecting first-degree muscle strains (small fibres breaking) that are difficult to diagnose through magnetic resonance imaging or ultrasound. Another aspect to have in consideration is that the traditional laboratory technique (Western blot) used to analyse myosin isoforms, is slow and not very sensitive, so it is not possible to implement it in a practical way for elite sports.

For this reason, research performed by members of FC Barcelona and the University of Barcelona,7 have used a faster and more precise technique (ELISA), rather than the traditional methods, by measuring myosin levels in the blood for Sporting de Gijón club throughout a season. Also, the concentrations of CK and lactate dehydrogenase (LDH) were measured in order to compare the evolution of myosin with that of biomarkers traditionally used for monitoring players.

Table 1. Serum muscle marker levels during preseason and season.

The behaviour pattern of both fast and slow myosin along the season was similar (table 1). In the first month of the preseason, the concentrations decreased (August) and increased significantly at the beginning of the season (September), coinciding with the increase in physical load. This increase was not quantitatively the same, as these types of fiber were damaged to different degrees, as indicated by the ratio in table II (which shows a greater damage of the fast ones). Afterwards, the levels of both isoforms decreased significantly despite the fact that the training load was maintained, indicating a muscular adaptation to training.

Table 2. Fast and slow myosin values and their ratios.

In turn, CK and LDH behaviour was different. The CK and LDH values showed an increase at the beginning of the preseason and returned to basal levels along the preseason. In this case, it seems that these are the first serum markers to appear when the muscular workload is increased, reflecting an inflammatory process located in the fibre membrane before the disruption of the fibre itself. If its structure is completely damaged, myosin would be released into the blood, a process that could already be measured with myosin isoforms.

Therefore, measuring the serum levels of myosin isoforms can be a new procedure to help improve the monitoring process for training sessions and the competition. The researchers claim that “it is possible to detect alterations in the structure of the sarcomere”, which could help prevent more damage during the season. In the near future, if blood sample analysis times are shortened, the impact of training and competition on each type of fibre could be identified, helping to control the damage and thus avoiding second and third-degree progression that wouldn´t allow players to compete.

 

 

BIHUB team

 

References:

 

  1. Garrett WE, Califf JC, Bassett FH. Histochemical correlates of hamstring injuries. Am J Sports Med. 1984;12(2):98-103. doi:10.1177/036354658401200202
  2. Qaisar R, Bhaskaran S, Van Remmen H. Muscle fiber type diversification during exercise and regeneration. Free Radic Biol Med. 2016;98:56-67. doi:https://doi.org/10.1016/j.freeradbiomed.2016.03.025
  3. Nédélec M, McCall A, Carling C, Legall F, Berthoin S, Dupont G. Recovery in soccer. Sport Med. 2012;42(12):997-1015.
  4. Guerrero M, Guiu-Comadevall M, Cadefau JA, et al. Fast and slow myosins as markers of muscle injury. Br J Sports Med. 2008;42(7):581 LP – 584. doi:10.1136/bjsm.2007.037945
  5. Carmona G, Guerrero M, Cussó R, et al. Muscle enzyme and fiber type-specific sarcomere protein increases in serum after inertial concentric-eccentric exercise. Scand J Med Sci Sports. 2015;25(6):e547-e557. doi:10.1111/sms.12363
  6. Carmona G, Roca E, Guerrero M, et al. Sarcomere Disruptions of Slow Fiber Resulting From Mountain Ultramarathon. Int J Sports Physiol Perform. 2015;10(8):1041-1047. doi:10.1123/ijspp.2014-0267
  7. Guerrero M, Carmona G, Rodas G, Cadefau JA, Maestro A, Cusso R. Assessment of muscle fiber adaptation in footballers using a new ELISA assay of myosin isoforms. J Sports Med Phys Fitness. 2019;59(11):1828-1834. doi:10.23736/S0022-4707.19.09463-5

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Two in every one hundred thousand young athletes die every year from what is known as sudden cardiac death. It is a small figure, but every single case is devastating: not only for their families and loved ones, but also for society, which will be in shock at such an unexpected death.

PLAYER ORIENTATION, A KEY ASPECT OF PREDICTIVE MODELS IN FOOTBALL

In the OptaPro Forum this week, Carlos Rodríguez will be presenting a study currently being carried out by the club on the body orientation of players in different game situations. We sat down for a chat with him so that he could give us a brief explanation of the project.

WHICH VARIABLES DO WE TRAINERS LOOK AT TO HELP US MAKE DECISIONS?

Of all the variables provided by the systems that monitor and record our players’ activity, what is the most relevant information? This is a question that all coaches will probably face when they begin managing the large volumes of data generated in every training session.

FC BARCELONA: HOW OUR NEW RESEARCH HELPED UNLOCK THE ‘BARÇA WAY’

For the first time, our new research may provide some insight into the training methodology and, potentially, the secrets of the club’s success. These “secrets” could be closely associated with the theories put forward by coach Paco Seirul·lo and how they link with cutting edge sports science.

DO FOOTBALL PLAYER’S MENTAL ABILITIES INFLUENCE THE RISK OF INJURY?

Mental abilities, although not yet fully appreciated, are already considered a relevant part of performance. But their importance could go beyond that: Do they also influence the injury risk, including recurrence, once the player returns to play?

NEW DATA ON PHYSICAL DEMANDS IN BASKETBALL PLAYERS

A basketball player performs approximately one thousand actions on average during a game, and at least one out of every ten requires high intensity. The detailed analysis of these physical demands allows for optimized training, improved performance and decreased injury risk.

INJURY TYPE IN HANDBALL MAY VARY BY POSITION, CATEGORY AND MATURATION OF PLAYERS

Although several studies have tried to evaluate the characteristics of the risk of injury in handball players, they have been unable to reach sufficiently reliable conclusions. A new study of all the FC Barcelona handball categories has attempted to shed more light on the subject.

IS IT POSSIBLE TO DEVELOP AN “UNBREAKABLE” ATHLETE?

HOW PHYSICAL DEMANDS ON FOOTBALL PLAYERS VARY BY THEIR POSITION

Although there are several studies on this topic, many of them have analyzed these demands by looking at just a few variables or using very broad timeframes. A new study completed by physical trainers from F.C. Barcelona has analyzed several of these details more closely.

THE IMPORTANCE OF THE CONNECTIVE TISSUE IN MUSCLE INJURIES

An article published in The Orthopaedic Journal of Sports Medicine —in which members of the club’s medical services participated— now suggests to consider the detailed structure of the area affected, and treating the extracellular matrix as an essential player in the prognosis of the injury.

HAMSTRING AND OTHER MUSCLE INJURIES IN CHILDREN AND YOUNG ATHLETES

This is a groundbreaking study that addresses hamstring injuries in children and youth. The results indicate that the risk is lower than it is in adults, though no less significant, and that it increases progressively with age.

WHAT IS LOAD MANAGEMENT REALLY ABOUT?

In this article, Tim Gabbett and his team provide a user-friendly guide for practitioners when describing the general purpose of load management to coaches.

TWO WEEKS ARE ENOUGH TO INCREASE MUSCLE VOLUME AND STRENGTH

For the first time, it has been demonstrated that it does not take months of training to significantly improve both muscle volume and strength; instead, two weeks of an appropriate exercise are enough.

RECOVERY NUTRITION FOR FOOTBALL: BUILDING A TEAM

ECCENTRIC EXERCISES: STUDYING “VACCINES” FOR MUSCLES

Training using eccentric exercises is important to prevent possible damage. However, intensive training can also cause muscle damage, so it is critical to be vigilant in order to keep injury risk to an absolute minimum.

SURGERY FOR CENTRAL HAMSTRING TENDON INJURIES: AN INTERNAL STUDY

Two years ago, the FC Barcelona medical team decided to operate on the athletes with this type of injury. What were the results?

AN OBJECTIVE CLASSIFICATION OF MUSCLE INJURIES

An objective and appropriate classification would improve the accuracy of prognosis, allow treatment to be adjusted and reduce the risk of re-injury.

STUDY OF HIGH INTENSITY ACCELERATIONS AND DECELERATIONS IN SOCCER

A new dimension of analysis suggests that maximum accelerations occur with a frequency 8x greater than sprint actions.

THE LEVEL OF RESISTANCE AS A MODERATOR OF THE TRAINING LOAD

Cardiovascular endurance manifests as a moderator of the load result to which the athlete is exposed.

PRE-SEASON TRAINING LOAD AND INJURY RISK

The pre-season or preparatory phase of the season is a time when major “errors” in training load management are often committed.

Are the players well positioned in relation to the ball?

Through the use of computer vision we can identify some shortcomings in the body orientation of players in different game situations.

The Athlete’s Physical: an Essential Examination

A health check must detect situations which, despite not showing obvious symptoms, may endanger athletes subject to the highest demands.

Diagnostic Imaging in Sports Medicine: Present and Future

Muscle injuries account for more than 30% of all injuries in sports like soccer. Their significance is therefore enormous in terms of training sessions and lost game time.

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