Neurofitsol

The Posterior Oblique Subsystem (POS) is comprised of:

Lower Trapezius
Serratus Posterior Inferior
Latissimus Dorsi
Thoracolumbar Fascia (Superficial Posterior Layer)
Contralateral Gluteus Maximus
Contralateral Gluteus Medius (via the gluteal fascia)

Function (Brief):
The muscles that comprise the POS are the largest in the body. This subsystem plays a significant role in stabilizing the lumbar spine, sacroiliac joint (SIJ) and hip, as well as transferring force between lower and upper extremities. The POS plays an active role in all pulling and rotational movement patterns (especially turning out), multi-segmental extension (with less lumbar extension – excessive lordosis), and eccentrically decelerates spinal flexion and rotation, as well as hip flexion, adduction and internal rotation (knees bow in and excessive forward lean). The POS is the functional antagonist of the Anterior Oblique Subsystem (AOS).

Concentric Function: Pulling, rotation “outward”, multi-segmental extension with less reliance on lumbar extension
Isometric Function: Transfer force between lower and upper extremities, stabilization of the SIJ, lumbar spine and hips
Eccentric Function: Decelerate spine flexion and rotation, as well as hip flexion, adduction and internal rotation

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Function (Brief):
The DLS is comprised of muscles with a propensity to act synergistically; rarely do these muscles act as prime movers. This subsystem plays an important role in motion of the tibiofibular joints, hip joints, sacroiliac joints and spine, and may aid in proprioception by altering recruitment strategies based on the load and stretch imparted on the system during heel strike. The DLS is active during gait, forward bending (more so when knees are near full extension), and lumbar extension, and eccentrically decelerates spine flexion, hip flexion, and ankle inversion. Over-activity of the DLS may contribute to the following signs on the Overhead Squat Assessment: shoulders elevate, excessive lordosis (anterior pelvic tilt), knees bow in (functional valgus), feet turn-out and feet flatten (pronation). The DLS works synergistically with the Posterior Oblique Subsystem (POS).

Concentric Function: Heel strike to push-off during gait, assist with lifting from a forward bent position, lumbar hyper-extension.
Isometric Function: Stabilization of tibiofibular joints, hip joints, sacroiliac joints and all segments of the spine.
Eccentric Function: Decelerate leg swing to heel strike during gate, assist with eccentrically deceleration of forward bending, and ankle inversion.

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