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ForceDecks Test Protocol – Isometric Test

Greg Marusic
  • Updated

Potential variant: Isometric Posterior Chain Test

Potential variant: Isometric Calf Raise

Starting PositionStarting position varies depending on the isometric test being performed. 
Protocol
  1. Zero plates - Zero the plates. Ensure nothing is touching the plates during this step.
  2. Weigh individual - Measure the individual's weight.

Important: For isometric tests where the bodyweight is being supported by something other than the plates (e.g., Shoulder ISO-I), only the limb being tested should be weighed.

  1. Assume starting position - Ask the individual to assume the starting position on the plates.
  2. Stabilise individual - Instruct the individual to remain completely still, in the starting position for 2-3 seconds before and between each rep in the test.
  3. Perform test - Instruct the individual to:
    1. Contract as hard and as fast as possible; then
    2. Hold at maximum force output for a minimum of 2 seconds; then
    3. Relax after the contraction; then
    4. Assume the starting position again.
  4. Repeat - Repeat step 5 to record the desired number of reps.
  5. Complete the test - Click to stop the recording and check the results.

Test overview

A range of Isometric (ISO) tests can be performed, and reps automatically detected on ForceDecks, however it is important to note that they will all be generically detected as an "Isometric Test."

Some common ISO tests include:

  • Isometric Mid-Thigh Pull (IMTP);
  • Athletic Shoulder (ASH) test; and
  • Various posterior chain tests.

This category of tests is paramount in determining the maximum force output possible across numerous areas of the body.

The goal of the ISO test is to determine the maximum force output possible, although protocols will vary.

Important note: for some ISO tests only a portion of the athlete's body is on the plates rather than their entire bodyweight. For example:

  • A supine 90/90 hamstring test (just the lower leg); or
  • The ASH test (just the palm).

For this reason, during the "weigh athlete" stage of test setup, the athlete should be weighed while they are relaxed and in the exact testing position they will use. This ensures the reference weight is correct, allowing accurate detection of when limb begins isometric contractions.

Data trace and body movement

An example Bilateral ISOT (in this case IMTP test) is shown below.

Fd_ISO.png

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