ForceDecks Test: Single Leg Drop Jump Protocol

The Single Leg Drop Jump (SLDJ) test is a popular test for assessing muscle stretch-shortening capacity, readiness and coordination, as well as unilateral balance and stability. The protocol for SLDJ tests is identical to the Drop Jump (DJ) test, except it is performed on one leg at a time.

ForceDecks App Protocol

Starting Position
  • 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 one foot; then
    4. Immediately jump as high as possible; then
    5. Land softly on the same foot, 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.
Reps 1 - 100 reps
Default Instant Results


  • 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]

Related Article: ForceDecks Test: Drop Jump Overview