College of Massage Therapists of British Columbia (CMTBC) Practice Exam

In the context of postural assessment, which muscle weakness is often associated with increased lumbar lordosis?

1. Rectus abdominis

2. Soleus

3. Gluteus medius

4. Erector spinae

The correct answer is: Rectus abdominis

In postural assessment, increased lumbar lordosis is often linked to an imbalance in the muscles that control the pelvis and lumbar spine. Specifically, weakness in the rectus abdominis can contribute significantly to this condition. The rectus abdominis plays a crucial role in stabilizing the pelvis and lumbar spine, as it helps to control anterior pelvic tilt. When there is weakness in this muscle, it may not adequately counterbalance the pull of the hip flexors and back extensors, resulting in an exaggerated curve of the lumbar spine (increased lordosis). Maintaining a strong rectus abdominis is essential for a neutral spine position. When this muscle is weak, it can lead to greater anterior tilt of the pelvis and increased arching of the lower back, hence promoting excessive lumbar lordosis. Therefore, recognizing the role of the rectus abdominis in this context is critical for understanding postural deviations and developing treatment plans to correct these imbalances.