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V.C. Muscular Stability

V.C. Muscular Stability. Abdominal muscles on ventral side: 1. Prevent V.C. hyperextension 2. Pull pelvis toward sternum 3. Pull thorax toward pelvis Erector Spinae muscles on dorsal side: 1. Compress V.C. 2. Holds V.C. together. CONTRALATERAL Trunk Flexion.

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V.C. Muscular Stability

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  1. V.C. Muscular Stability • Abdominal muscles on ventral side: 1. Prevent V.C. hyperextension 2. Pull pelvis toward sternum 3. Pull thorax toward pelvis • Erector Spinae muscles on dorsal side: 1. Compress V.C. 2. Holds V.C. together

  2. CONTRALATERAL Trunk Flexion moving trunk away from “throwing” armFIG 7.4page 233

  3. IPSILATERAL Trunk Flexion moving trunk towards the “throwing” arm “UNDERARM” Throw Pattern

  4. LORDOSIS • Pelvis tilted towards anterior • often due to weak abdominal muscles • treatment: 1. stretch hip muscles [extensors and flexors] 2. strengthen abdominals and hip flexors

  5. SCOLIOSIS • mediolateral curvature of V.C. [“S” curve] • often caused by one leg shorter than other • treatment of functional problem: 1. Stretch Concave side  ) interior of curve 2. Strengthen Convex side )  exterior of curve

  6. KYPHOSIS • exaggerated curve of V.C. anterior/posterior • bending forward of thoracic area along with flattening of lumbar curve • treatment: 1. Strengthen V.C. extensors 2. Stretch V.C. flexors [thoracic area]

  7. Rounded Shoulders • Treatment: 1. Strengthen retractors of shoulder girdle 2. Stretch protractors of shoulder girdle

  8. move vertebral column if pelvis isfixed or stabilized move pelvisif vertebral column is fixed or stabilized move thighsif pelvis is fixed/stabilized move pelvisif thighs are fixed/stabilized SIT UPSAbdominalsHip Flexors

  9. Long Lying Sit-Up: FIG 7.6a page 237 • If Abdominals are Strong: • Abdominals are the prime mover • Abdominals ALONE flex the Vertebral Column • Hip Flexors stabilize pelvis (H.F.do not flex V.C.)

  10. Long Lying Sit-Up: FIG 7.6a • If Abdominals are WEAK: • Abdominals alone cannot flex V.C. (Abs only assist) • Hip Flexors are the prime movers • Hip Flexors pull pelvis and lumbar disks compress

  11. “Leg Lifts”: FIG 7.6b If Abdominals are WEAK: • Abdominals cannot stabilize pelvis (prevent flexing) • Pelvis flexes due to pull of Hip Flexors • Lower Back hyperextends, lumbar disks compress • This exercise requires very strong abdominals

  12. “Bent Leg or Curl” Sit-Up: FIG 7.6c • Hip Flexors are shortened (Length/Tension principle) • H.F. stabilize pelvis (do not flex pelvis) • Abdominals must do most if not all of the work • minimizes hyperextension of lumbar vertebrae

  13. “Snap-Up”: FIG 7.6d • simultaneous Hip and V.C. flexion • requires  Torque from Abdominals in 2 ways:1. flexion of the Vertebral Column 2. stabilize Pelvis to prevent it rotating forward

  14. Bent Leg “Curl” Sit Up on Incline BoardFIG 7.6e page 237 • incline position allows resistive Tg to have  ROM • depending on  of board, Tg may never reach 0

  15. “CRUNCH” SIT-UPNon-Supported Supported More difficult Less difficult from KIN 300/301 Exercise Book by Natascha Weschpage 48

  16. “CRUNCH” SIT-UP: non-supported • Stabilizers activated • Pelvis “flat” or tilted forward • no V.C. hyperextension

  17. Lumbar HYPERFLEXION  FIG 4.18a page 163 FIG 4.16c page 161

  18. Lumbar HYPEREXTENSION FIG 7.9 page 242  FIG 7.10page 242

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