Jumping into Conclusions- Beyond the Eccentric Utilization Ratio


Dr. McGuigan and colleagues in 2006 researched the relationship between between the Squat Jump (SJ) and Counter Movement Jump (CMJ) and found that the ratio between the two was an indicator of training and potentially fatigue. We expect that the CMJ will be higher, but how much higher is a sign of training and where the talent lies. What is interesting with linear encoders is that they are beyond just contact mats. While I think at the HS setting it’s fine to use the just jump mat, how one scores their jump height is popular among some coaches. How an athlete applies power is beyond air time and contact time as the legs and technique variability is not high enough for sensing fatigue. Remember a vertical jump is about maximum height, and sometimes athletes start finding ways to get similar scores, and that’s why good eyes and technology is a great tool. How much dip from their center of mass and what switch times they have from eccentric to concentric actions is something that could be valuable to those that are looking for ways to look at fatigue from eccentric damage. Repeat jumps (less than 5) are great ways to see trends from testing without causing them from the fatigue of testing. Some coaches add weight vests for training and testing, but I have not trained it yet. I think systems such as Gymaware and now opensource software with kinect like tools are going to rapidly put companies like Eliteform out of business. With price costs of an opensource option being 500 per rack, I would question investing into such technology.

Carl Valle

Carl Valle

Track & Field Coach
Carl is an expert coach who has produced champions in swimming, track and numerous other sports. He is one of the foremost experts in the fields of nutrition and restoration.
Carl Valle

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