Spine Mechanics for lifters Flashcards
1
Q
what is important in CrossFit
A
lumbar curvature
2
Q
What to learn about spine
A
lumbar spinal anatomy and mechanics
3
Q
How to express mechanical concepts into numbers during a lift
A
biomechnical model using computers for a lift like deadlift
4
Q
Three forces on the spine
A
Compression, shear( twisting and torsion) , tension
5
Q
Shear force
A
Force that acts parallel to surface, in spine create sliding of one vertebra with respect another
6
Q
During deadlift
A
- Weigh tof upper body, weight of object , weight of arms all act onto rotate the lumbar spine at L4-5.
7
Q
At fully flexed position
A
The muscle erector spinae / back extensorsmusculature is disabled, the load then moves to the ligaments which increases the shear force.
8
Q
At a neutral spine posture
A
interspinous ligaments are disabled , reduces joint shear by allowing th muscle to activate,
