Jump & Power
Squat Jump Test
Vertical jump performance from a static squat position.
The Squat Jump Test analyses, on video, a vertical jump performed from a static squat without a countermovement. It calculates jump height from flight time and gives information about concentric explosive strength of the lower limbs.
What Is It Used For?
- Assessing lower limb explosive strength
- Tracking performance through training or rehabilitation
- Comparison with the countermovement jump (CMJ) to examine use of elastic energy
- Providing objective data during return to sport
Measured Parameters
- Jump height (cm)
- Flight time (ms)
- Best and average value across trials
Setup and Camera Placement
- Fix the camera to the side of or in front of the client; take-off and landing of the feet must be clearly visible.
- The camera should be about 3 metres away at hip height.
- The whole body must stay in frame including the top of the jump; leave enough space above.
- The floor should be flat, firm and non-slip.
Tips for Accurate Measurement
- If there is a downward dip before the jump, the trial should be discarded.
- Hands should stay on the hips throughout; arm swing increases the result.
- Knees should not be tucked in the air; land with legs extended, similar to take-off.
- Keep the camera steady and the room well lit; the feet should not be in shadow.
- Have the client warm up briefly before the test.
How Is the Test Done?
- The client takes a squat position with hands on hips and knees bent to about 90°.
- The client holds this position still for 2–3 seconds.
- Without any further downward movement, the client jumps as high as possible.
- The client lands on the forefoot and stands balanced.
- 3 trials are performed with rest in between.
What Will I See on the Results Screen?
- Jump height and flight time for each trial
- Best trial and the average of trials
- Measurement history stored in the profile and change over time
Interpreting the Results
- A higher jump may indicate greater concentric power output; values vary widely with age, sex, sport and training level.
- Countermovement jump (CMJ) height is usually higher than Squat Jump; the difference can give an idea of how well the stretch-shortening cycle is used.
- The most reliable comparison is with the client's own earlier measurements under the same protocol.
- Flight-time-based calculation is affected by take-off and landing technique; consistent technique matters.
Clinical Use Example
For a volleyball player starting a strength block, the Squat Jump and countermovement jump tests are performed at the start and end of the block. Changes in the heights and in the difference between the two tests are used to follow the programme's effect on explosive strength.