Physical Therapy Assistant Practice Exam

What is the MOST likely reason for using a wedge during a modified sit-up for abdominal strengthening?

1. To enhance hip flexor engagement

2. To target weak rectus abdominis

3. To improve thoracic extension

4. To increase overall core strength

The correct answer is: To target weak rectus abdominis

Using a wedge during a modified sit-up primarily targets the weak rectus abdominis by modifying the mechanics of the movement. The wedge elevates the pelvis and shifts the angle of the sit-up, which can help to isolate the abdominal muscles more effectively. When the pelvis is tipped, the rectus abdominis – which runs from the pubic bone to the ribs – is encouraged to engage more fully during the movement, thus allowing for a more focused strengthening exercise. This positioning can take some strain off the hip flexors, often overactive in traditional sit-ups, hence reducing their contribution to the movement and allowing the rectus abdominis to do most of the work. This targeted approach is beneficial in rehabilitation and strengthening scenarios where the rectus abdominis may be particularly weak or in need of further isolation to improve function and stability in the core region.