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,