Anterior Oblique Subsystem Integration
By Brent Brookbush MS, PES, CES, CSCS, ACSM H/FS
The Anterior Oblique Subsystem (AOS) is comprised of:
- External Obliques
- Abdominal Fascia/Linea Alba
- Contralateral Anterior Adductors
- Internal Obliques
- Rectus Abdominis
- Note: The internal obliques and rectus abdominis are not traditionally viewed as muscles of the AOS. However, based on my considerations of anatomy, function, and available research, and observations in practice, adding these muscles to this subsystem adds congruence to our understanding of muscular synergies, motor behavior, and predictive models of movement impairment.
Stabilization of the anterior kinetic chain (including the joints of the pubic symphysis, hip and lumbar spine), transfer of force between lower and upper extremities, integrated (whole body) pushing movements, “turning-in” of the kinetic chain, eccentric deceleration of total-body supination.
The Anterior Oblique Subsystem (AOS) is an important stabilizer of the anterior kinetic chain. This subsystem has little direct effect on joint arthrokinematics (when compared to the Posterior Oblique Subsystem (POS) and the sacroiliac joint); however, it is indirectly involved in stabilization of the lumbar spine, thoracic spine, rib