The Multi Rebound Test
Many sports require a constant repetition of movements as opposed to single bouts of explosivity. The Multi-Rebound Jump test assesses reactivity, endurance and efficiency of the stretch-shortening cycle.
The Multi Rebound Test
1. The Weighing Phase
The weighing phase is also known as the “Quiet” phase and as the name suggests this requires the athlete to be as still as possible on the plates before they start the test. We recommend placing the hands on the hips and standing in an upright position; however, coaches will exercise some flexibility in this depending on their goals.
2. Initial Jump Unweighting Phase
In a typical multi-rebound jump test, the first jump will have a countermovement element to it. Therefore, after the signal to begin the test the athlete will begin by flexing at the knees and the hips to lower the body towards the ground which reduces the force on the plates. This phase begins as soon as the athlete begins the movement; this is why it is crucial that the athlete remains still during the weighing phase.
3. Initial Jump Braking Phase
The braking phase is also known as the “stretching” and/or “eccentric” phase. As the athlete approaches there desired squat depth, they will begin to slow the centre of mass down by reapplying force. This ultimately acts to stop the bodies falling motion before moving into the propulsive phase. In our software, braking is defined as when an athlete’s Centre of Mass velocity is still negative but is ascending toward 0 m/s.
4. Initial Jump Propulsive Phase
After the athlete has stopped moving downwards, the propulsive phase begins. This phase is sometimes referred to as the “concentric” or “push-off” phase. In this phase, the athlete will rapidly extend their hips, knees and ankles to propel the body vertically which results in the Jump. By definition, this phase begins when the Centre of Mass velocity becomes positive and ends as soon as the athlete has left the plate.
5. Initial Jump Flight Phase
The Flight Phase begins once the athlete has fully left the force plate, also known as the instant of take-off. This phase then ends at the instant of touchdown whereby the athlete first re-contacts the plate.
5. Rebound Braking Phases
Each flight phase is succeeded by a braking phase. This phase begins when the athlete re-connects to the plate from the jump. This phase requires the athlete to absorb the forces of the landing by flexing the hips, knees and ankles; this will slow the centre of mass down before transitioning into the propulsive phase of the next rebound jump.
5. Rebound Propulsive phases
After the rebound braking phase the athlete will begin to rapidly extend his hips, knees and ankles again to send the centre of mass upwards and into the 2nd jump (rebound jump).
5. Rebound Flight Phases
As before, this phase begins once the athlete has fully left the force plate and ends when they contact the plate again. Repeat this process as many times within either a time limit or as a pre-determined amount.
The Test Results
Who should do the test?
Sports that require a constant repetition of movements as opposed to single bouts of explosivity. This is particularly useful for assessing agility, reactivity, endurance and efficiency.
What metrics are recorded?
15 metrics that include peak and average scores for reactive strength index, jump height and force as well as total jumps and symmetry
How long does the test take?
Customisable from 1 to 20 seconds
Where do I learn more?
Please call 01344 623 883 for further information.