Countermovement Jump Rebound (CMJ-RE)

The CMJ Rebound Test Type can be customized by creating & applying a "Tag". Below you can find common CMJRE tags. No tag on the system typically implies "hands on hip".
  • Bilateral CMJRE
  • Single Leg CMJRE
  • Hands on Hips
  • Arm Swing
  • Loaded Conditions
HD_TestingGif.CMJ

The CMJ Rebound is a unique hybrid test of the CMJ (slow stretch shortening cycle) & Drop Jump (fast stretch shortening cycle). This test can be completed by performing 2 maximal CMJ attempts maximizing jump height for both attempts. Or 1 maximal CMJ attempt and 1 CMJ as quick as possible minimizing time on the ground - utilizing limited knee flexion.

The Hawkin Performance Team recommends using the 2 maximal CMJ option during the last stage of the Return To Play process. It can also be substituted as an alternative for the Drop Jump, with much less of a learning curve for novice athletes - utilizing the 1 maximal CMJ first and 1 quick off the ground CMJ second.

How To Video
Side View CMJ-RE Hands on Hips (2 Maximal CMJs)
Instruct the athlete to start with their hands on their hips. Perform a standard CMJ and instead of landing to stabilize, the athlete should execute a reactive jump upwards. Upon landing, they should stabilize. 

 

Side View CMJ-RE Arm Swing (2 Maximal CMJs)
Instruct the athlete to start with their hands above their head. On the beep rapidly throw the arms down and begin the descent. Make sure to use a 🏷 of "Arm Swing" to aggregate the data separate from the CMJR tests with hands on hips.
Front View CMJ-RE (1 Maximal & 1 Quick Off the Ground)
HubSpot Video
With this type of CMJ-RE instruct the athlete to jump as high as they can on the first attempt, and quick off the ground on the second attempt. This style is more of the hybrid test of slow stretch shortening cycle function (CMJ 1) and fast stretch shortening cycle function (CMJ 2, the "rebound" jump). This is a video by Dr. John McMahon, force plate researcher out of Salford.

CMJ Rebound Research:

 

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