The 4 Muscle Subsystems

Question 1

Deep longitudinal subsystem

Answer 1

Helps to stabilize the body from the ground up, more specifically, it provides force transmission longitudinally from the foot and ankle to the trunk and back down (walking) .

The major soft tissue contributors are: anterior tibialis, fibularis (peroneus) longus, biceps femoris, sacrotuberus ligament, thoracolumbar fascia, erector spinae.

Question 2

Posterior oblique subsystem

Answer 2

The posterior oblique subsystem works synergistically with the (DLS) Distributing transverse plane forces created through rotational activities. It is also of great importance for for other rotational activities such as swinging a golf club, Baseball bat, Or throwing a ball. dysfunction of any structure in the (POS) can lead to sacroliliac joint (SIJ) instability and low back pain (LBP).

It is comprised of: gluteus maximus, Lat dorsi, thoracolumbar fascia

Question 3

Anterior oblique subsystem

Answer 3

When we walk our pelvis must rotate in the transverse plane to create a swinging motion for the legs. This rotation comes in part from the (POS) and the (AOS).

Hip external rotators, adductor complex, external oblique, internal oblique.

Question 4

Lateral subsystem

Answer 4

The lateral subsytem Is implicated in frontal plane stability and is responsible for pelvo-femoral stability during single leg movements such as in gait, lunges, or stair climbing. Dysfunction in the lateral subsystem is evident By excessive pronation of the knee, hip and/or feet During every day movement and exercise. (Lateral movement).

TFL, gluteus medius, adductor complex, contralateral quadratus lumborum.