What measurement is recorded during the isometric trunk extensor endurance test?

What measurement is recorded during the isometric trunk extensor endurance test?

• A. Time duration the trunk remains horizontal.
• B. Number of repetitions completed.
• C. Peak torque achieved.
• D. Blood pressure response during the hold.

Answer: (A)

The measurement focuses on endurance of the back-extensor muscles by how long you can hold the trunk in a horizontal position without movement. In this isometric test, you lie prone with the upper body unsupported and try to maintain a straight, horizontal trunk. The key metric is the time you can maintain that position before the hips drop or the trunk can no longer hold—recorded in seconds. This reflects endurance, not peak strength or repetition count, and is distinct from dynamic measures or physiological responses like blood pressure. Longer hold times indicate greater endurance of the trunk extensors and better spinal stability under static load.

The measurement focuses on endurance of the back-extensor muscles by how long you can hold the trunk in a horizontal position without movement. In this isometric test, you lie prone with the upper body unsupported and try to maintain a straight, horizontal trunk. The key metric is the time you can maintain that position before the hips drop or the trunk can no longer hold—recorded in seconds. This reflects endurance, not peak strength or repetition count, and is distinct from dynamic measures or physiological responses like blood pressure. Longer hold times indicate greater endurance of the trunk extensors and better spinal stability under static load.