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What Does the Concave Curvature in the Propulsive Phase Mean?
Is it a bad test that should be discarded? It is it a technical deficiency? Lack of proper protocol? Or an issue with my software? See the Picture below for an example:
- What you’re seeing in the above trial/ graph, is a CMJ performed with a characteristic of a "double peak" which we call a "bimodal pattern".
- Two members of our science team, Professor Jason Lake and Dr John McMahon published a study on CMJ force patterns a few years ago and found force patterns to be quite inconsistent overall; but most consistent for jumpers who perform with a bimodal pattern.
- For example, across 10 CMJ repetitions, no single jumper consistently performed with a unimodal (a single peak) pattern whereas 60% consistently performed with a bimodal pattern and 40% were inconsistent (switching between pattern types).
- So, what you are seeing in your trial, is more common than uncommon. The force pattern can be influenced by the verbal cues given (longer jump times are associated with bimodal patterns) and the jumper’s weight (heavier jumpers are more likely to show bimodal patterns).
Summarized Answer:
- It is not clear whether certain baseline force patterns are good or bad thing from a scientific evidence perspective, but they do seem to be unique to the jumper and they can change in response to training adaptations, fatigue and injury. The most important thing is to learn what is typical for the jumper when they are injury free, fatigue free and familiarized with the CMJ. You can then monitor their force pattern over time in the Hawkin cloud.
Please Find the Study in the Link Below-