Intrinsic Stabilization Subsystem (ISS)

This course describes the intrinsic stabilization subsystem (ISS), a concept originally proposed by Dr. Brent Brookbush to integrate the work of professionals such as Vleeming et al. (1), Hodges et al. (20), Bergmark, A. (1989), Comerford and Mottram (2001), etc. This subsystem may also be referred to as intrinsic core muscles, deep core muscles, intrinsic stabilizers, stabilizing system, local stabilizers, and is related to the terms muscle sling, myofascial sling, myofascial synergy, core subsystem, myofascial lines, myofascial trains, anatomy trains, myofascial meridians, and deep front line.

The Intrinsic Stabilization Subsystem is comprised of:

• Transverse Abdominis (TVA)
• Internal Obliques
• Pelvic Floor (Levator ani, coccygeus, and associated fascia)
• Diaphragm
• Multifidus
• Rotatores, Interspinales & Intertransversarii
• Abdominal Fascia (posterior layer)
• Continuous with investing fascia of the Diaphragm and Pelvic Floor
• Thoracolumbar Fascia (TLF) (anterior and middle layer)
  • Potentially
    • Quadratus Lumborum
    • Psoas

Function (Summary)

• Concentric Function: None (potentially traction/decompression)
• Isometric Function: Stabilization of the lumbar spine, SIJ, and pelvis
• Eccentric Function: Contributes to eccentric deceleration of lumbar flexion and lateral flexion.

Common Maladaptive Behavior

• Under-active

Practical Application

• Core
  • Quadruped Progressions (TVA Activation)
• Integrated Exercise
  • N/A

The concepts and techniques described in this course may be particularly beneficial for neuromuscular re-education, coordination, motor pattern integration, whole-body strength, functional strength, and sports performance. Sports medicine professionals (personal trainers, fitness instructors, physical therapists, massage therapists, chiropractors, occupational therapists, athletic trainers, etc.) should consider adding these exercises to their repertoire to improve the outcomes of their integrated exercise programs, sports performance programs, and therapeutic (rehabilitation) interventions.

Pre-approved Credits for:

• Human Movement Specialist (HMS) Certification

Pre-approved for Continuing Education Credits for:

• Athletic Trainers
• Chiropractors
• Group Exercise Instructors
• Massage Therapists
• Occupational Therapists
• Personal Trainers
• Physical Therapists
• Physical Therapy Assistants
• Yoga Instructors

This Course Includes:

This Course Includes:

• AI Tutor
• Study Guide
• Text and Illustrations
• Research Review
• Technique Videos
• Sample Routine
• Practice Exam
• Pre-approved Final Exam

Additional Subsystem Courses

• Anterior Oblique Subsystem (AOS)
• Posterior Oblique Subsystem (POS)
• Deep Longitudinal Subsystem (DLS)

Caption: Key muscles of the intrinsic stabilization subsystem (ISS): transverse abdominis, diaphragm, multifidus, and pelvic floor.