Length-Tension Relationship

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Length-Tension Relationship

• Sit-ups

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Muscles that produce flexion at the hip

• Iliopsoas (Iliacus and Psoas major)
• Sartorius
• Rectus femoris
• Tensor fasciae latae
• Pectinius (assists)
• These muscles are two-joint muscles, also acting
  at the knee

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Iliopsoas Iliacus and Psoas Major

• Origin
• Iliacus Illium
• Psoas major Lumbar vertebrae and sacrum
• Insertion
• Lesser trochanter of the femur and just below
• Actions
• Flexion at the hip
• External or lateral rotation at the hip

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Iliacus muscle
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Psoas major
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Sartorius

• Origin
• Anterior superior iliac spine
• Insertion
• Anterior-medial aspect of the tibia
• Actions
• Flexion at the hip
• External (lateral) rotation at the hip
• Flexion at the knee

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Rectus Femoris

• Origin
• Anterior inferior iliac spine (ilium)
• Insertion
• Patella, patellar tendon, tibial tuberosity
• Actions
• Flexion at the hip
• Extension at the knee

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Rectus Femoris
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Tensor fascia latae

• Origin
• Iliac crest (Illium)
• Insertion
• Iliotibial tract
• Actions
• Flexion of the hip
• Abduction of the hip
• Slight internal rotation at the hip

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Tensor Fascia Latae
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Muscles of the abdomen

• Rectus abdominis
• External oblique
• Internal oblique
• Transverse abdominis

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Rectus Abdominis

• Origin pubis (pubic crest, symphysis pubis)
• Insertion sternum and ribs (xiphoid process,
  cartilage)
• Actions
• Bothflexion, compression
• Single lateral flexion

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External Obliques

• Origin ribs (lower 8)
• Insertion Iliac crest, pubis, inguinal ligament,
  linea alba
• Actions
• Both flexion
• Single lateral flexion, rotation

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• External Oblique

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• External oblique

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Internal Obliques

• Origin Iliac crest, inguinal ligament
• Insertion ribs, linea alba
• Actions
• Both flexion
• Single lateral flexion, rotation

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Internal Oblique
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Internal oblique
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Transverse Abdominis

• Origin
• Iliac crest, cartilage of ribs
• Insertion
• Pubis, linea alba
• Action
• Compression, forced expiration

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Transverse Abdominis
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Transverse abdominis