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What type of jump should I use?
The Sayers Equation used in the peak power assessment was first designed for a squat jump (SJ), however scientific literature has found that it is also valid and reliable for a countermovement jump (CMJ). It is ultimately up to the practitioner to determine which type of jump they would like to use for their athlete's assessment.
Best practice to compare changes in peak power output overtime would be to perform the same type of jump (i.e. SJ or CMJ) during both timestamps of testing. Also make sure to update the athlete's bodyweight.
What is Peak Power?
Power output is an essential component of success in sport. If an athlete can produce both high levels of force and power, they will typically be the better, more explosive athlete.
Peak power is the point of the vertical jump that has the highest power output. This is different from mean/average power, where the average power output is calculated throughout the entire jump. Peak power occurs when the athlete begins to leave the ground or the "toe-off" phase of the jump.
Peak Power Formula
The peak power formula used for this testing is the Sayers Equation. This is one of the most scientifically validated formulas in current literature.
This formula takes into account the athlete's bodyweight, meaning it is a relative peak power value. This is important for tracking overtime because over the course of an off-season the athlete may gain or lose bodyweight. Like bodyweight, jump height will also fluctuate depending on programming. This value will help coaches and athlete's track changes in peak power overtime as adaptation occurs.
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