Should you arch your back

SHOULD YOU ARCH YOUR BACK?

For people without vertebral problems, arching the back during an exercise is not risky. In fact, with movements such as the squat (page 46) or the deadllft (page

132), where the back tends to round, arching the back can prevent Injury. However, for some people arching the back during an exercise can be very dangerous.

* For people suffering from congenital spondylolysis (incomplete fusing of the vertebral arch), putting the lumbar spine in extension can cause the vertebra to slide (spondylolisthesis), which may cause serious nerve compression and lead to sciatica.

* For people who are not fully grown or people experiencing osteoporosis, extending the lumbar spine may lead to spondylolysis because of fractures in the vertebral arch. This fracture in the posterior anchoring system of the vertebra may allow the vertebra to slide forward and seriously compress the neural elements (which leads to sciatica).

Levator costarum longus

Interspinalis

Intertransversarii lumborum medialis intertransversarii lumborum lateralis

Lumbar costoid process

Levator costarum brevis

Rotatores thoracis

Interspinalis

Lumbar vertebra, superior articular process

SMALL DEEP MUSCLES OF THE BACK

12th rib Multlfidus

Iliac

Lumbar vertebra, inferior articular process

Sacrum

Thoracic vertebra, spinous process

SMALL DEEP MUSCLES OF THE BACK

Levator costarum longus

Interspinalis

Intertransversarii lumborum medialis

12th rib Multlfidus intertransversarii lumborum lateralis

Lumbar vertebra, superior articular process

Lumbar costoid process

Iliac

Lumbar vertebra, inferior articular process

Sacrum

Levator costarum brevis

Rotatores thoracis

Thoracic vertebra, spinous process

Mamillary

■ Spinous process

Lamina of the vertebral arch

Levator Costarum Brevis

Vertebral body intervertebral surface

LUMBAR VERTEBRA FROM ABOVE

Vertebral body intervertebral surface

LUMBAR VERTEBRA FROM ABOVE

Mamillary

■ Spinous process

Lamina of the vertebral arch articular process Accessory process Costoid process Vertebral foramen Pedicle of the vertebral arch

With spondylolysis (fracture of the vertebral arch) the vertebra may slide forward (spondylolisthesis) and compress the neural elements, causing sciatica.

Spondylolysis

(fracture of the vertebral arch)

Sacrum

Lumbar vertebra

Intervertebral disc

With spondylolysis (fracture of the vertebral arch) the vertebra may slide forward (spondylolisthesis) and compress the neural elements, causing sciatica.

Spondylolysis

(fracture of the vertebral arch)

Sacrum

Lumbar vertebra

Intervertebral disc

Abdominal Muscles Pics

VARIATION WITH A BAR ACROSS THE SHOULDERS

VARIATION EXTENDING AT AN INCLINE BENCH

Gastrocnemius Semimembranosus \

Ouaclriceps, vastus lateralis

Biceps femoris, long head

W Spiiialis thoracis

Longissirhus thoracis i

External intercostals»

lliocostalis thoracis

Humerus

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