What is the primary function of the Posterior Oblique Subsystem?

The primary function of the Posterior Oblique Subsystem is to transfer forces from the transverse plane to the sagittal plane during activities such as walking or running. This subsystem is a group of muscles, including the latissimus dorsi and the contralateral gluteus maximus, that work synergistically to create a powerful connection between the upper and lower body. When one leg steps forward, this subsystem helps to optimize the transfer of energy and stability, facilitating efficient movement and balance during locomotion.

In this context, while stabilizing the lumbar spine is important, it is not the primary role of the Posterior Oblique Subsystem. Its main contribution lies in force transfer and coordination between the upper and lower body, especially across the transverse plane. Enhancing upper body strength or improving flexibility of the hips relates to other muscle functions and systems, but those are not the core functions associated specifically with the Posterior Oblique Subsystem. Therefore, the emphasis on force transfer during dynamic activities like walking or running accurately reflects the subsystem's purpose in functional movement patterns.