Isolated and Integrated Muscle Functions
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| Anterior Tibialis |
ISOLATED FUNCTION: concentrically accelerates dorsiflexion and inversion
INTEGRATED FUNCTION: eccentrically decelerates plantarflexion and eversion, isometrically stabilizes the arch of the foot
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| Posterior Tibialis | ISOLATED FUNCTION: concentrically accelerates plantarflexion and inversion of the foot
INTEGRATED FUNCTION: eccentrically decelerates the dorsiflexion and eversion of the foot, isometrically stabilizes the arch of the foot
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| Soleus |
ISOLATED FUNCTION concentrically accelerates plantarflexion
INTEGRATED FUNCTION decelerates ankle dorsiflexion, isometrically stabilizes the foot and ankle complex
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| Gastrocnemius |
ISOLATED FUNCTION: concentrically accelerates plantarflexion
INTEGRATED FUNCTION: decelerates ankle dorsiflexion, isometrically stabilizes the foot and ankle complex
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| Peroneus Longus | ISOLATED FUNCTION: concentrically plantarflexes and everts the foot
INTEGRATED FUNCTION: decelerates ankle dorsiflexion, isometrically stabilizes the foot and ankle complex
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| Biceps Femoris - Long head |
INTEGRATED FUNCTION:
Eccentric Action - decelerates knee extension, hip flexion, and tibial internal rotation
Isometric Action - Stabilizes the lumbo-pelvic-hip complex and knee
INNERVATION: tibial nerve
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| Biceps Femoris - Short head | ISOLATED FUNCTION: concentrically accelerates knee flexion and tibial external rotation
INTEGRATED FUNCTION: eccentrically decelerates knee extension, eccentrically decelerates tibial internal rotation, isometrically stabilizes the knee
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| Semimebranosus |
Isolated function: Concentrically accelerates knee flexion, hip extension, and tibial internal rotation
Integrated function: Eccentrically decelerates knee extension; Eccentrically decelerates hip flexion; Eccentrically decelerates tibial external
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| Semitendinosus |
ISOLATED FUNCTON: concentrically accelerates knee flexion, hip extension, and tibial internal rotation
INTEGRATED FUNCTION: eccentrically decelerates knee extension, eccentrically decelerates hip flexion, eccentrically decelerates tibial external
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| Vastus Lateralis |
ISOLATED FUNCTION: concentrically accelerates knee extension
INTEGRATED FUNCTION: eccentrically decelerates knee flexion, adduction, and internal rotation, isometrically stabilizes the knee
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| Vastus Medialis |
Isolated function: Assists in concentric acceleration of knee extension.
Integrated function:
-Assists in eccentric deceleration of knee flexion, adduction and internal rotation during heel strike.
-Assists in dynamic stabilization of the k
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| Vastus Intermedius |
Isolated function: Assists in concentric acceleration of knee extension.
Integrated function: -Assists in eccentric deceleration of knee flexion, adduction and internal rotation during heel strike. -Assists in dynamic stabilization of the knee du
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| Rectus Femoris |
Isolated function: -Assists in concentric acceleration of knee extension. -Assists in concentric acceleration of hip flexion.
Integrated function:
-Assists in eccentric deceleration of knee flexion, adduction and internal rotation during heel s
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| Adductor Longus |
Isolated function: Assists in concentric acceleration of femoral adduction, flexion and internal rotation.
Integrated function: -Assists in dynamic stabilization of the lumbo-pelvic-hip complex during functional movements. -Assists in eccentric d
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| Adductor Magnus - Anterior Fibers | Fibers
Isolated function: -Assists in concentric acceleration of femoral adduction, flexion and internal rotation. -The adductor magnus assists in concentric acceleration of hip extension.
Integrated function: -Assists in dynamic stabilization of
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| Adductor Magnus - Posterior | Isolated function:
-concentrically acceleration of femoral adduction, flexion and internal rotation.
-concentrically acceleration of hip extension.
Integrated function:
-dynamically stabilization of the lumbo-pelvic-hip complex during functi
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| Adductor Brevis | Isolated function:
-concentrically acceleration of femoral adduction, flexion and internal rotation.
Integrated function:
-Assists in dynamic stabilization of the lumbo-pelvic-hip complex during functional movements.
-Assists in eccentric de
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| Gracilis |
Isolated function:
-concentrically acceleration of adduction of the femur.
-concentrically acceleration of internal rotation of the femur.
Integrated function:
-eccentrically deceleration of knee extension prior to heel strike.
-eccent
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| Pectineus |
Isolated function:
-concentrically acceleration of femur adduction.
-concentrically acceleration of internal rotation of the hip.
Integrated function:
- eccentrically deceleration of abduction of the femur.
-eccentrically deceleration o
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| Gluteus Medius |
Isolated function: -Assists in concentric acceleration of femur abduction. -Anterior fibers: assist in concentric acceleration of hip internal rotation. -Posterior fibers: assist in concentric acceleration of hip external rotation.
Integrated fun
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| Gluteus Minimus |
Isolated function:
-concentrically acceleration of hip abduction.
-concentrically acceleration of hip internal rotation.
Integrated function:
-eccentrically deceleration of hip adduction.
-eccentrically deceleration of hip external rot
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| Gluteus Maximus |
Isolated function:
-concentrically acceleration of hip extension.
-concentrically acceleration of hip external rotation.
Integrated function:
-eccentrically deceleration of hip flexion, hip adduction and hip internal rotation during the
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| Tensor Fascia Latae | Isolated function:
-concentrically accelerates hip flexion, abduction, and internal rotation
Integrated function:
-eccentrically decelerates hip extension, adduction, and eternal rotation
-isometrically stabilizes the lumbo-pelvic-hip complex
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| Psoas |
Isolated function:
-concentric acceleration of hip flexion.
-concentric acceleration of hip external rotation.
Integrated function:
-eccentric deceleration of hip extension.
-eccentric deceleration of femoral internal rotation at heel
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| Iliacus | Isolated function:
-Concentrically accelerates hip flexion and external rotation.
Integrated function:
-Eccentrically decelerates hip extension and internal rotation.
-Isometrically stabilizes the lumbo-pelvic-hip complex.
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| Sartorius |
Isolated function:
-Assists in concentric acceleration of internal rotation of the tibia.
-Assists in concentric acceleration of abduction of the tibia.
-Assists in concentric acceleration of knee flexion.
-Assists in concentric accelerati
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| Piriformis |
Isolated function:
-Assists in concentric acceleration of external rotation of hip.
-Assists in concentric acceleration of hip extension.
-Assists in concentric acceleration of hip abduction when the hip is flexed.
Integrated function:
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| Rectus Abdominis |
Isolated function:
-Assists in concentri acceleration of spinal flexion.
-Assists in concentric acceleration of posterior pelvic rotation.
Integrated function:
-Assists in eccentric deceleration of spinal extension, lateral flexion and r
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| External Oblique |
Isolated function:
-Assists in concentric acceleration of spinal flexion
-Assists in concentric acceleration of contralateral rotation of the spine
-Assists in concentric acceleration of posterior pelvic rotation
Integrated function:
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| Internal Oblique |
Isolated function:
-concentrically accelerates spinal flexion, lateral flexion, and ipsilateral rotation
Integrated function:
-eccentrically decelerates spinal extension, rotation, and lateral flexion
-isometrically stabilizes the lumbo-pelv
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