Metabolic power based summary of higher conditional exertion phases during a game

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 7 (part 4).

Today follows a summary of the analysis we are doing of the higher conditional exertion phases that one professional spanish soccer player demonstrated during a friendly preseason game.
Remember that basically I have selected those periods based on the cardiac output (detection of the periods where the HR reaches the 90% of the individual HRmax, and search when the HR has started to raise before arriving to this point), and that we are analyzing them under the metabolic power approach.

You will see the comparison between the averages of higher conditional exertion phases for each variable used with the average of the first time of that game ... At the end, we have to understand that our conditional target when training and preparing our players for the competition demands shouldn't be referenced by the average data obtained from all the game, but from the higher conditional exertion phases, that probably could limit their performance ... Maybe with this approach we could relate it better with fatigue and with the individual capability of "specific endurance", that under my view, maybe should be better addressed in soccer ...

Next post, for the new year, we will use the same data to de the analysis under the intermittent approach.

Enjoy the post, but above all, enjoy this period of time!!!

Characteristics of higher conditional exertion phases during games based on Pmet

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 7 (part 3).

Following with the last posts, I introduce today the comparison of the data obtained from a spanish professional soccer player during the first time of a friendly preseason game.
This is a basic comparison between the average value of the same parameters during all the first time with those of the different higher conditional exertion for the same player of the same game.
The parameters used in this example are based on metabolic power calculation, and are the next:
- average metabolic power
- average metabolic power over 20 w/kg
- average metabolic power under 20 w/kg
- average speed when metabolic power is over 20 w/kg
- average speed when metabolic power is under 20 w/kg

Enjoy, and Merry Christmas!!!

Metabolic power during phases of higher conditional exertion during games

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 7 (part 2).

After the intro and some comments respect another study that has been published recently related with the analysis of the activity of those periods of higher conditional during games and also the periods after (study done analyzing activity during 5' duration periods), I will present some data related with another approach to the same issue, using intermittency and metabolic power data to observe the conditional demonstration and duration of this periods of higher conditional exertion during games.

Enjoy,

High exertion phases during soccer pro games

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 7 (part 1: Intro).

In this 7th level of analysis of the conditional demonstration of professional soccer players I want to introduce the analysis of the higher conditional demonstration phases that take place during every soccer game.
Traditionally this sort of analysis has been done through the measurement of the HR initially, and lately with the HR and measurement of activity of the players, basically distance run depending on some velocity based thresholds.
As this approach has been already published by different authors in international journals, I'll not show any data of it.

Instead, I'll show you two other approaches based on intermittency and metabolic power, as a way of analyze the individual and also collective conditional exertion of soccer players.

Stay tuned,

Gray's metabolic power approach and comparison with Di Prampero's one

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 6 (part 5).

Today I'll introduce the Adrian Gray metabolic power approach (Gray and col. 2011. Energetic analysis of running demands in australian football using global positioning systems technology. PhD Thesis), to which I have had the fortune to have access to it (thank you Adrian!).
This alternative metabolic power approach, that has not yet been extensively applied (done that the more important international GPS systems based brands are using the Di Prampero approach), has its own characteristics that are essentially different from that of Di Prampero.
Gray propose an approach based on the calculation of mechanical work to obtain the the metabolic power, basically horizontal and vertical work, work against air resistance and limbs work. But what it's really interesting is that both approaches, with so different ways of calculating, gives very similar average data when applied to a specific task analysis. In fact, Gray uses the same metabolic power zones.

After the short introduction, and in order to better understand the differences that each approach "offers", I present you a graph in which you'll see the metabolic power data of both approaches applied to a game action, also with velocity and acceleration data.
In this action, in which the player perform 3 consecutive CoD with some sprints of different duration, you will be able to distinguish and understand the differences of each approach, that basically are related to the "weight" that each one puts to acceleration and velocity portion of the sprint.

Enjoy,

Game basic analysis with Di Prampero approach to metabolic power

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 6 (part 4).

We continue this week with Di Prampero approach to metabolic power analysis, looking at the comparison between the mechanics of running on a slope surface at constant velocity and an accelerated level run. This basic approach to the issue is then applied to the analysis of italian professional soccer games, and just gives us a basic comparative on the implications of doing the analysis with a traditional velocity and distance approach, in which there is a little % of total distance ran of higher intensity (velocity), or with the metabolic power approach, in which the % of higher intensity performed by the players is much more elevated.

All the graphs and information has been used with permission of the authors, and it comes directly from the Colli's group, in Italy, who are doing a really great effort in giving a different view of the issue of specific conditioning.

Stay tunned!

Essentials of Di Prampero metabolic power approach

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 6 (part 3).

With this post I'll introduce the basic concepts to the metabolic power approaches, that under my actual knowledge are two: the known and proposed by Di Prampero (2005, 2009) and applied by Osgnach and col. 2010, and the probably less known proposed and applied by Gray 2011.

Both approaches are really interesting, but what it's important (under my view) is that using different approaches, the results when applied to field data are very similar (not so when analyzing individual maximal actions ... but we will talk about this later).

So in today post, I'll try to introduce the essential concept proposed by Di Prampero for the analysis of the metabolic power. It's extracted from the papers related before.

Enjoy,

Metabolic power approach: intro II

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 6 (part 2).

Today I show you the second part of the introduction to the metabolic power approach to soccer conditional demonstration.
In it I comment something related to the different metrics generally used (which under my view should be further developed ...), and with it we let the path to the next post in which you'll see the two metabolic power approaches that, under my actual knowledge, actually exist with a scientific background (international scientific paper or PhD thesis).

Stay tunned!

Metabolic power approach: intro

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 6 (part 1).

We arrive today at the 6th (arbitrary) level of analysis of conditional demonstration analysis and approaches of soccer players.
In this level we will talk about the metabolic power approach, as a general concept, and about some of its characteristics.
In this first intro post (there will be a second intro part) I will introduce the general trends of what we are going to talk, but there is of special importance to know some of the limits that affect each approach, and ...
Stay tuned!

Closing the circle: actions and pauses duration in soccer games

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 5 (part 8).

As the title says, I show you today some data related with the average duration of actions and pauses phases during professional soccer friendly games.
As commented during the videopost, remember that with this, and maybe with all sort of information presented in any study, it's of paramount importance to be cautious not only in how we use the info presented, but before this point, to be aware of the fact that depending on the methodology used for capturing the data, and specially the characteristics of the technology used, hard and software, we will find differences between studies, and sometime big differences which can send us to different "paths" when trying to use/apply them to day a day training.

In this sense, I have explained before the methodology used in the approach, and also some of the limits that present.

As an example and under my knowledge, directly linked with today's issue (duration of pauses) none of the known main international GPS system brands give us directly this info, so it means that we have to obtain it using our algorithms. But what it's really relevant is that under the same brand, depending on the version of the software, and as it changes the algorithm used to offer the actions duration, based on the changes of the characteristics of how the hardware captures the data, the result of the analysis changes!!!
Yes, what you read. So you can imagine the difficulty and the attention we have to put in our analysis when comparing data coming from different sources, methodologies, GPS brands, software versions ...

Appart from that, also remember that this data is the average of some friendly games monitored, so it means that in the analysis is also included the time when the game is stopped.

Enjoy,

Intensity of games actions through acceleration

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 5 (part 7).

Following the last post in which I showed the data of the intensity of the soccer friendly games actions based on the speed demonstrated by the professional players of an Spanish team, you will see today the same approach based on the acceleration data.
In it you will find the average data of the intensity of the actions based on acceleration for soccer games, analyzed int two ways: the average of the maximum acceleration demonstrated by each player during each game (so data coming from just one action, the maximum acceleration one), and the average of all the accelerations demonstrated by each player in each game (so data coming from all the actions performed during the game). You will have the opportunity to compare it with the maximum value of acceleration (average for all the players of the maximum acceleration attained by each player during the season) for the team, so you can make your own conclusions ... if you want to share, they will be welcome!!!

Remember that all data we are using in this short of analysis highly depends on the system used, its specific software, the algorithms used, the filtering process of the raw data obtained, ... so have this in mind.

Enjoy,

The intermittent approach to soccer games

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 5 (part 6).

It arrives the moment to apply this intermittent approach to the analysis of soccer games: in this case, I show you the average data from the analysis performed with a spanish professional soccer team, in which we get data from all the friendly games performed during that pre-season and in-season (11 in total).

We have used the data obtained of all the players that participated in a complete 45 min of each game.
Logically this approach has its own limits (only 45 min, friendly games, preseason, in-season using mainly players "non-starters" ...) but it's a good reference to take in account.

Another big issue that we have commented in previous posts is referred to the GPS system; as you know, technology limits or guides us in a way ... but we have to try to use it in our direction ...
We have use 10 units from a competitive brand in that years (2007-2008), that unfortunately has not been able to adapt at the level required ... A little demonstration - confirmation of it is the paper of Buchheit et al. 2013 :http://martin-buchheit.net/2013/08/20/monitoring-accelerations-with-gps-in-football-time-to-slow-down/

Anyway, you can see here a little but important demo of how to apply the intermittent approach to the analysis of soccer games, and the data obtained as a reference ...

Hope you enjoy,

The equalizer in intermittency

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 5 (part 5).

After exposing the basic characteristics of the intermittent approach for the analysis of the conditional demonstration of soccer players (not only ...), and in order to better understand the complexity of the relationship between these parameters (intensity and duration of actions and pauses), I present you what I call "the equalizer": it's just a simple explanation through a simile comparing what happens with these parameters and with a music equalizer, with a characterization of what happens during a "standard" soccer game ...

Under this approach we can better understand what short of demands are we proposing to our players, how are they really performing, ... but also there is an approach of how to distinguish between the different orientation of soccer training tasks, drills and exercises traditionally introduced in the same "endurance" bag, and of course, it help us to better understand why the traditional methodological approach to endurance development in soccer players (not only) has proposed different methods (running intervals, technical circuit "intervals", SSG "intervals", HIT, HIIT, RSA, ...) that all seems to provide an increment in the concept of endurance (specific ...?) and a development in players "specific"? fitness.

Hope you enjoy,

Basic parameters that define intermittency

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!

Intermittency during soccer games

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.

Velocity demonstration in soccer games

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,

Intro to intermittency

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!

Decelerations: relationship between velocity, acceleration and time

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!!!

Decelerations using "raw data": relationship between time and acceleration

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,

Relationship between velocity and acceleration

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,

Relationship between time and decelerations

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 8).

We follow with some basic relationships between decelerations and, in this case, time for arriving to the maximum value of deceleration.

In default of more studies with large samples of soccer players, and specifically professional players, we observe that harder decelerations are performed in less time, so at first, this concept should be introduced when analyzing decelerations, especially when taking in account its intensity.

The data showed today has been obtained with a 5 Hz GPS unit, from a veteran spanish soccer player, when performing sprints with CoD in different conditions, changing the velocity prior to the CoD, changing also the way of performing the deceleration (hard, hard trying to apply more flexion on knees and hip, progressive, etc.), and when training using different SSG.

One very important thing that usually is forgotten is that the Hz of your units, but specially the filters used by the system - software used, modify this short of relationship between decelerations and time, so we have to be careful when doing this short of analysis done that this information is not used, not known by the users.

Enjoy,

Relationship between acceleration, deceleration and impacts

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 8).

You know that actually one approach when analyzing the load that soccer players are experiencing during training and competition is related with the number of decelerations performed. We have been talking about some characteristics of decelerations, and their relationship, and also we have shared some data to better understand all this issues.
Despite we tend to relate decelerations with the eccentric muscular load experienced by players, we sometimes forget that there is also a relationship between decelerations and the load in joints, bones and tendons, which we can approach to its measure by the impacts (shock) count.
This is a very interesting approach to have in account specially with some injured players (when they are in their readaptation (rehabilitation) process.

Done that, you will see a simple example of a sprint with a CoD of 12m + 12m performed by a veteran spanish soccer player, with the relationship between the phases of acceleration and deceleration (also the CoD), and their relationship with the impacts performed.
Remember that the impacts are measured by a triaxial accelerometer working at 100 Hz, but the velocity (and  the acceleration derived) is measured by a GPS working at 5 Hz, but when exported to Excel, the data appears at 1 Hz ... (for further questions on this issue better ask directly for them, please). These are some of the problems that you have to, at least, know about the technology we are using (and this is one of the main brands on GPS for sports ...).

Enjoy,

Relationship between decelerations and velocity

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 7).

Just in order to let you know some of the findings about decelerations in soccer players, I show you these data in which you see the relationship between acceleration and velocity in accelerated and decelerated runs performed with and without ball (in shuttle sprints of different intensity and in small sided soccer games).

During this and next posts, I'll try to comment about different parameters that affect the performance and the load experienced by the players when decelerating.

Hope you enjoy!

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 6).

More about how different softwares show deceleration data.

One more enterprise GPS based for the monitoring of soccer players, and the solution of Roberto Colli group (from Italy).
As you can imagine or really know, there exist more possibilities, but or they are relatively new or their solutions are no so "compact" as these (but attention! Maybe I'm wrong!!!).
Anyway, the idea is just to show you easily the main possibilities and one the latests solutions (that of R. Colli group) which represent a different way of monitoring, not only by it's original approach, but also by it's price.
We just have to be actualized because new solutions are emerging, but remember, what really matters are (in my view), the reliability of the system - enterprise (attention with post-selling technical service), usability (friendly and not time consuming) software, and its utility for each one of you: what do you really want to know from your players - team? Does the software give you as you want? And of course the price ...

In the next post I'll comment something about the relationship between velocity and deceleration.
Stay tunned!

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 6).

How different softwares show us deceleration data.

I start with this post a series in which I'll comment different characteristics of decelerations.
It's important to have in mind that as decelerating is a more complex pattern of movement, and there is not too much studies that has deepen in its characteristics, I'll just present you some little and limited research done by myself with data from amateur and professional Spanish and Swiss soccer players, in order to better understand decelerations and its complexity.

In today's post you will see the typical data you get from two actual enterprises based on GPS for the monitoring of soccer players, basically based on absolute values and general zones defined by acceleration customizable thresholds.

In next post you will see more data from two other enterprises, in order to see their similarities and differences.

Stay tuned!

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 5).

And we arrive today to the explanation of how to use the proposed algorithm to individualize the analysis of the acceleration demonstrated by the players.

Remember that this data have been obtained monitoring different soccer teams, two professional soccer teams (one Spanish and other Swiss), and one Spanish amateur soccer team.

Basically you will see the process of using this algorithm, that relate acceleration with velocity, but have in mind that if you use it, it is nothing else than an "average" of data of a good quantity of soccer players, so if you really want to individualize this short of analysis, you should get your own data from each of your players.

So this is just a "guide" to use when, for example, you start to get data from your players, but you have no previous data for having a reference, as when starting a preseason with new players, ...

Hope you enjoy,

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 4).

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 4).

Following the last post, we arrive to the practical application of this relationship between velocity and acceleration when performed by professional and amateur soccer players, in the control of the conditional load, and also the characteristics of the slope of this relationship, which show us if the ability of the soccer players between acceleration and velocity are balance or not, in order to use it for individualizing some content of our trainings.
You will see the average data of this parameters of two professional soccer teams from different countries (Spain and Switzerland), and also including an Spanish amateur soccer team, which at the end are under the same values.

This data is the key factor for individualizing the control of accelerations demonstrated by the soccer players which until now are just taken in account as absolute values with absolute thresholds (accelerations over 1m/s/s, over, 2m/s/s, etc), that doesn't allow us to correctly interpret the real intensity of an acceleration.
Imagine an absolute value of an acceleration of 2,5 m/s/s performed with an initial velocity of 0 km/h (so from an standing start) or another of the same value performed with an initial velocity of 15 km/h (a change of rhythm) ... Same absolute value, but completely different relative intensity of the acceleration performed!

Enjoy,

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 3).

Following the last post in which you have seen recently data that relates maximum acceleration with velocity, I present you today some graphics in which you can observe how this short of data evolve with time in the same season. First with data get from different spanish amateur soccer players, just comparing maximum acceleration with maximum velocity demonstrated during training in a one month period of time, and second the relationship between acceleration and the initial velocity demonstrated by some professional (first division) spanish soccer players showed in a graphic with data get during the 2007-2008 season.

Do you find some anything in common between all this data?

Stay tunned, more from the next post!!!

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (part 2).

Let's go today to try to deepen in the relationship between the velocity and the acceleration that a soccer player can demonstrate, and the relationship between them.
In this case I show you some data recently taken from a veteran spanish amateur soccer player, with whom we did a testing session that we have done some years ago with professional soccer players from a Spanish First Division soccer team.
After the warming up, the soccer player performed different trials of 20m at full speed, but 2 of them with a standing start, 1 from a previous walking constant speed, and 3 more from a previous running constant speed, 1 slow, 1 medium and 1 high speed.
You will see the graphic of the relationship between the initial velocity when starting the 20m and the maximum acceleration demonstrated just after the changing of the velocity for performing the 20m full.

Remember that as I have already comment before and I will also do constantly, it is really important to know the limits of the approaches that we use when we work, and one of them when using technology (in this case I use a GPS system for capturing the data of the soccer player), is the way that the software detects the accelerations, that depends directly on the algorithm used, but also on the filter used on the raw data.

In the next post we will see more related data based on professional soccer players.

Enjoy,

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 4 (intro).

Yes, we are in the next level!

In it, we will talk about the individualization of the analysis of the acceleration demonstrated by professional and amateur soccer players, how is it used actually this sort of information, and how you can use it in a much more individualized way.
I will show you some data in which you clearly understand much better the relationship between the acceleration demonstrated and the velocity that the player showed when starting this acceleration, coming from professional and amateur soccer players.

For today post, we talk about how it is actually used the acceleration data, and some limitations that you should (must) know about it.

Enjoy,

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 3 (part 9 and last of this 3rd level!).

And we arrive to the last post (at this moment) of this 3rd level, in which you can see an example of individualization of the conditional load control of a session performed by a professional Swiss soccer team (FC Sion, 2013 season). The basis of this individualization is to relate the session data, analyzed individually and collectively, with the data obtained in the friendly games played during the preseason, as measure of reference, offering a percentage (%) of the different variables individually and also integrated by an algorithm, in order to compare the conditional load demonstrated by each player and by the team in the training session with the game load.

Hope you enjoyed!

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 3 (part 8).

Individualization of the session analysis based on the individual profile, position profile and team profile, in professional soccer players.

Appart from this sort of analysis that we have been looking, it arrives the moment of doing a quick sightseeing in an example of an individualize approach of a training session of a professional Swiss soccer team. We will deepen in future posts.

Important: this is a methodological approach that is based in some assumptions that are far away to be perfect, but are more or less time efficient, and give as an idea of the individual and team training load.

Basically, we have used the data of each individual player demonstrated during all the friendly games done during the sort winter preseason (7 games) to establish an individual profile, a position profile and a team profile, that we use to compare with the data of the same variables obtained during the training session, as a % of game load.

Enjoy,

Approaches and level of analysis of the physical demonstration of professional soccer players. Level 3 (part 7).

Following the last video-post, today you will find more data obtained from a spanish professional soccer team, in which we have done a comparison of the same variable, distance ran in zone 6 (related with maximum velocity), but with different velocity threshold: a general one (so the same velocity threshold value for all the players, the same used by Amisco System in maximum speed zone), and an individualized one (over 80% of the maximum velocity of each player demonstrated during all training and friendly games during a season).
This is a powerful data, done that n=143, and it correspond to the average distance ran in this maximum speed zone by each player of the team during the 11 friendly games that the team played during the preseason and in season. 
You will see the differences, and then you can decide the importance or not of individualizing these data.

Anyway, in my opinion, it could be so important to use a general or a individualized approach, depending on WHAT you want to analyze.

Enjoy,