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NASM PES Ch 2

Major Muscles of HMS

MusclesConcentric ActionIsometric Action
sartorius hip flexion, external rotation & abduction, knee flexion, external rotation LPHC and knee
tensor facia latae hip flexion, abduction, internal rotation LPHC
rectus femoris hip flexion, knee extension LPHC and knee
biceps femoris - long head knee flexion, hip extension, tibial external rotation LPHC and knee
semimembranosis hip extension, knee flexion, tibial internal rotation LPHC and knee
semitendinosis hip extension, knee flexion, tibial internal rotation LPHC and knee
adductor magnus, longus, brevis, gracilis & pectineus adduction, flexion,internalrotation, LPHC
gastrocnemius plantarflexion foot & ankle complex
soleus plantarflexion (esp. knee bent) foot & ankle complex
tibialis anterior dorsiflexion, inversion arch of foot
psoas hip flexion, external rotation, extends & rotates lumbar spine LPHC
gluteus maximus hip extension, external rotation LPHC
gluteus medius - anterior fibers hip abduction, internal rotation LPHC
peroneus longus plantarflexion, eversion foot & ankle complex
tibialis posterior inversion, plantarflexion arch of foot
vastus lateralis knee extension knee
vastus intermedius knee extension knee
vastus medialis knee extension knee
biceps femoris - short head knee flexion, tibial external rotation knee
adductor magnus - posterior fibers adduction, extension, external rotation LPHC
gluteus medius - posterior fibers hip abduction, external rotation LPHC
gluteus minimus hip abduction, flexion, internal rotation LPHC
piriformis hip external rotation, abduction & extension Hip and SIJs
rectus abdominus spinal flexion, lateral flexion & rotation LPHC
external oblique spinal flexion, lateral flexion & contralateral rotation LPHC
internal oblique spinal flexion (bilateral), lateral flexion & ipsilateral rotation LPHC
transverse abdominus increases intra-abdoominal pressure. supports abdominal viscera synergistically w/internal oblique, multifidus & deep erector spinae to stabilize LPHC
diaphragm pulls central tendon inferiorly, increasing the volume in the thoracic cavity LPHC
latissiumus dorsi shoulder extension, adduction & internal rotation LPHC, shoulder
serratus anterior scapular protraction scapula
rhomboids produces scapular retraction & downward rotation scapula
lower trapezius scapular depression scapula
middle trapezius scapular retraction scapula
upper trapezius cervical extension; lateral flexion & rotation; scapular elevation stabilizes cervical spine & scapula, stabilizes medial border of scapula creating a stable base for prime movers during scapular abduction & upward rotation
levator scapulae cervical extension, lateral flexion & ipsilateral rotation when scapulae is anchored; assists in elevation & downward rotation of scapulae cervical spine & scapulae
pectoralis major shoulder flexion (clavicular fibers), horizontal adduction & internal rotation shoulder girdle
pectoralis minor protracts the scapula shoulder girdle
anterior deltoid shoulder flexion & internal rotation shoulder girdle
medial deltoid shoulder abduction shoulder girdle
Created by: aprince07