ForceDecks Test: Drop Jump Protocol

• Standing on box or elevated platform, immediately behind force plates
• Normal standing posture
• Hands on hips
• Chest up and looking forward

1. Zero plates – Ensure nothing is touching plates and click "Zero Platforms".
2. Step on plates – Ask individual to step on the plates.
3. Weigh individual – Click “Measure Weight”. The individual must remain completely still, and the colour display must register green before accepting body weight.
4. Assume starting position – Ask individual to assume starting position.
5. Start Recording – Click "Start Recording”.
6. Perform jump - Instruct the individual to:
   1. Keep chest up and looking forward;
   2. Step off the box; then
   3. Land on the plates with both feet at the same time; then
   4. Immediately jump as high as possible; then
   5. Land softly, remaining completely still on the plates for 2-3 seconds; then
   6. Assume the starting position again.
7. Repeat jump – Repeat steps 4 and 6 to record a total of 3 drop jumps.
8. Stop recording – Click "Stop Recording".
9. Review – Review that reps and test type have been detected correctly.  You can manually correct the test type and/or manually mark trial ranges, if required.
10. Analyse – Click "Analyse and Save" - to move directly to next individual; or Click "Analyse" – to review results.

Performance

• Contact Time
• RSI (JH (Flight Time)/Contact Time) [m/s]
• Peak Takeoff Acceleration [m/s2]
• Jump Height (Flight Time) [cm]

• Peak Landing Force Asymmetry [% L,R]
• Landing RFD Asymmetry [% L,R]