Approaches and level of analysis of the physical demonstration of professional soccer players. Level 5 (part 4).
And we arrive to the "basis" of the intermittency when using it for the conditional demonstration of soccer athletes (not only soccer).
As you will see, intermittency can be defined basically by the characteristics of the periods of more intense activity, that we call ACTIONS, and the periods of less intense activity that we call PAUSES.
Both. actions and pauses must be selected by an intensity parameter (we will talk about in future posts), that not only determines their INTENSITY but also their DURATION.
So we talk about intensity and duration of actions, and intensity and duration of pauses.
I have added also the concept of RITHM, which we define as the average time between the start of different actions that are demonstrated during the game, training, task, drill, ...
As an exemple you will see some average data obtained from an spanish professional soccer team during all the friendly games that they played during 2007-2008 spanish La Liga season (7 preseason friendly games and 4 in-season friendly games). With this data I have used as key intensity parameter the acceleration (threshold value for considering an action 1 m/s/s with using a 1 hz GPS), because in those years there where not other better option ... (some years later I changed for what I understand are better options as metabolic power and mechanical horizontal power, but we will talk about it in future posts).
Hope you enjoy!
Approaches and level of analysis of the physical demonstration of professional soccer players. Level 5 (part 3).
After the traditional approach, in which we have commented that is based in some basic concepts between the relationship of exertion, intensity and duration of effort, but that has been mainly analyzed in activities with a continuous motor pattern (running, cycling, ...), in this post we add what does it implies and the possible relationship with the way that it's mainly been used for the analysis of the conditional demonstration of soccer players in games and training, that basically uses distances (total, over a defined velocity threshold, ...) and it's relationship with short of "endurance", muscle fibers and energetic supply related.
Also, I introduce the basics of the concept of intermittency ... and let the door open to next post, in which I'll explain which is the essence of it, and the basics parameters to analyze it ...
Stay tuned, and enjoy.
Approaches and level of analysis of the physical demonstration of professional soccer players. Level 5 (part 2).
For starting the explanation of the intermittent approach, I have just choose a 45 minutes of a professional soccer player who was wearing a GPS unit, so you will see a typical graphic with HR and speed curves, in which we introduce how the activity of that player has been shown depending on his speed ...
Stay tunned,
Approaches and level of analysis of the physical demonstration of professional soccer players. Level 5 (part 1).
Today we start the 5th level of analysis of the physical demonstration of soccer players.
In this introducing entry I'll explain the basis of the approach, that is, I'll just introduce the 4th basic parameters for analyzing the intermittency: intensity of the actions, duration of the actions, intensity of the pause and duration of the pause.
Under my view, this 5th level is the heart & soul of the approach for the correct conditional analysis of soccer players, that means that while the traditional approach is based (as explained in previous posts) on the relationship between speed, intensity, time of effort (related with critical power ...) and exertion (but investigated and developed with CONTINUOUS activity motor pattern), this approach is based on the basic characteristics of the activity of intermittent motor pattern, in which speed is not always directly related with intensity, but specially not directly related with exertion ...
This differences are the constraints under which we are actually working, and the essence of some of the problems we have for distinguish between the analysis and control of the conditional load of sessions and tasks during training (and games) ... But this is the content of a future post.
So hope I'll be able to get your attention ...
Stay tuned!
Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 11).
And we finally arrive to the last post on this issue to let go to the next level of the approaches.
In it we present and (try to) explain a graph in which velocity, acceleration and time of some decelerations performed after a sprint arriving to a different velocity has been performed.
This decelerations has been performed by an Spanish veteran amateur soccer player, so we have to be analyze with caution this data, done the differences that can exist between this soccer player profile and younger soccer players and/or soccer players of higher level of performance.
In this graph you will see in the X axis the instant velocity data, and in the Y axis both the acceleration and time data.
Basically, it seems as if the time to demonstrate the maximum acceleration value during the decelerated sprint becomes higher with higher velocity values, and as if the acceleration demonstrated during those decelerated sprints become harder (higher deceleration values) with higher velocity values.
Hope you enjoy!!!
Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 10).
As we have seen in previous posts, one of the problems we have when analyzing GPS data is the use of different filters, that in most cases we don't know which are and how they modify the original raw data.
That said, we also know that the filters are an invaluable tool when using this short of data, without which we can not work.
But in this case, the idea is to analyze if with the raw data we can see the same tendencies observed with filters (commented in previous posts) or there is some other questions that arise ...
The basic data you will see in the graphics is exactly the same used before, but in this case without applying any filter, and it comes from an veteran spanish soccer player, that has performed different exercises and specific tasks (sprints with different decelerations and CoD, and also data from some SSG), wearing a GPS unit working at 5 Hz.
Stay tuned,
Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 9).
Directly related with last video post, you will see the relationship that is establish between velocity and acceleration demonstrated by soccer players, with data obtained during some analytic drills performed at different intensities and in different conditions (with or without CoD, and with different speeds prior the deceleration), by a spanish veteran soccer player or some professional swiss soccer players during training or games.
As you will see, it seems that the maximum value of acceleration when decelerating is shown with an average velocity value of around 2 and 5 m/s, but not more, what could be interpreted (in absence of more specific data) as if the subjects would need to "slow down" their velocity until they can manage all the mechanical load imposed in their body when performing this short of decelerations.
We have to think that decelerating abruptly with a high quantity of energy accumulated (as with high velocity previous the posterior deceleration) and specially when it is performed suddenly as a response of the needs imposed by the game (during training or matches) is really a hard task directly related with very high forces supported by the body and their main directly implicated systems (as osteoarticular and tendinomuscular systems) just with one leg (when planting the foot on the ground) and not always in a favorable situation (think on degrees of freedom of different articulations, position, ...).
Hope you enjoy it,
