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Integration Drift Who? Should You Do 3 Consecutive Jumps?
Integration drift is a fancy way of saying that if you complete more than one Jump without saving the test you will ...
Integration drift is a fancy way of saying that if you complete more than one Jump without saving the test you will save data that is inflated (most likely). The video below shows the difference and shows why:
The Hawkin Dynamics Way
In the Hawkin Dynamics Cloud Software you complete one Countermovement Jump and then save it. We understand that this is different than other companies that allow multiple tests under one data collection. However, our research team has evaluated and continually evaluates this protocol and has found it to be unreliable. The first CMJ output will be okay, as long as a quiet standing phase was first gathered (for at least 1.0 second). If the athlete completes the next 2-?? tests without completely coming to a stand still between reps, then these test metrics will become significantly inflated on the seconds, third, fourth, and so on test. This is called Integration Drift, and a full review of this concept can be found here by Dr. Jason Lake. Dr. Lake is one of the world's most renown force plate biomechanist. He is currently a professor at Chichester University (UK).
A Video Of What Not To Do:
- Notice that the athlete is not coming to a stand still between jumps. A Quiet Standing period is vital to accurately calculate System Weight (i.e. the athletes weight in Newtons) in order to accurately collect the metrics that follow.
- The athlete is also moving his feet around between jumps. We call this 'happy feet' and this will also throw off your System Weight.
Interested In Learning More?
Download the CMJ Playbook to learn everything you need to know about the CMJ and how to accurately perform the test.