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Deep Longitudinal Subsystem (DLS) — Brookbush Institute | Brentbrookbush.com

Deep Longitudinal Subsystem (DLS) Integration

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

The Deep Longitudinal Subsystem (DLS) is comprised of:

Function (Brief):

The DLS is comprised of muscles with a propensity to act synergistically; rarely do these muscles function as prime movers. This subsystem plays important roles in motion of the tibiofibular joints, stabilization of the 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 very active during gait, forward bending (more so when knees are near full extension), and lumbar extension, and eccentrically decelerates spinal flexion, hip flexion, and ankle inversion. Over-activity of the DLS may lead to  shoulders elevateexcessive lordosis (anterior pelvic tilt)knees bow in (functional valgus), feet turn-out and feet flatten (pronation). The DLS works synergistically with the

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