Test background
This test was developed by Alex Natera (Manager of Performance Support at NSWIS) as part of his Run-Specific Isometric Assessment Battery, which also includes the Ankle Iso-Push and Knee Iso-Push.
This protocol follows the guidelines provided by Alex, including warm-up and assessment efforts.
More information on the Run-Specific Isometric Battery can be found in Alex Natera's blog post: "Pre-season assessments and monitoring: are returning athletes 'strong enough' to run fast?"
Weigh the individual
- For weigh in, have the individual lie on the ground under a loaded bar (weight of loaded bar must exceed ability to lift during test).
- Place the heel of the left foot on the left force plate.
- Position the inferior portion of the shoulder blades on a 15cm soft box.
- Lift the hips off the ground into a suspended bridge position and capture the weight (referred to as the ISO Hip system weight).
The same process can be completed to find the system weight for the right leg.
Assume the starting position
- Supine with heel of the active foot on the corresponding plate.
- 15cm soft box underneath the shoulder blades.
- Loaded bar across the waist restraining upward movement.
- Knee flexed between 135 and 145°.
- Hip flexed between 155 and 165°.
- Inactive leg lifted high off the plates.
Warm up
A general warm up should be conducted before the assessment, in addition to a specific warm up performed immediately before the test, this being:
- 3 x 3 second efforts at 70%, 80% and 90% effort with 10 second recovery between efforts.
The athlete then rests for 60 seconds before performing either a rapid force assessment or a maximal force assessment.
Perform the test
- Stabilise - instruct the individual to remain completely still in the starting position for 2-3 seconds before and between each rep in the test.
- Perform the rapid force assessment or maximal force assessment.
| Rapid force assessment | Maximal force assessment |
| 5 x 1 second efforts interspersed with 10 second recovery. |
2 x 3 second efforts with a 2 second build up. Each effort is followed by a 60 second rest. A third trial is then performed if the second trial is >3% of the first trial. |
Generally, 'Relative Peak Force' is captured and reported for maximal force trials and 'Force at 100ms' for rapid force trials.
After completing your test, click to stop the recording and check the test results. Remember to click Upload to save your test data to VALD Hub.
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