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Anterior Oblique Subsystem (AOS) — Brookbush Institute | Brentbrookbush.com

Anterior Oblique Subsystem Integration

By Brent Brookbush DPT, PT, COMT, MS, PES, CES, CSCS, H/FS

The Anterior Oblique Subsystem (AOS) is comprised of:

Function (Brief):

The muscles that comprise the AOS are the global movers of the anterior trunk and the adductors. This subsystem plays a significant role in stabilizing the thoracic and lumbar spine, sacroiliac joint (SIJ), pubic symphysis and hip, as well as transferring force between lower and upper extremities. The AOS plays an active role in all pushing and rotational movement patterns (especially turning in), multi-segmental flexion, and eccentrically decelerating spinal extension and rotation, as well as hip extension, abduction and external rotation (knees bow in and excessive forward lean). The AOS is the functional antagonist of the Posterior Oblique Subsystems (POS).
  • Concentric Function: Pushing, rotation "inward", multi-segmental flexion
  • Isometric Function: Transfer force between lower and upper extremities, stabilization of the SIJ, pubic symphasis thoracic and lumbar spine and hips
  • Eccentric Function: Decelerate spine extension and rotation, as well as hip extension, abduction and external rotation

Common Maladaptive Behavior

  • Over-active

Signs of AOS Dysfunction