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Guidelines for muscle activity during locomotion
Terms in this set (11)
What is considered the passenger unit of the body during locomotion?
- head, neck, and trunk
- 70% of body weight
- C of G is anterior to T10
What is considered the locomotor unit of the body during locomotion?
- lower limbs and pelvis
- 11 joints
What are the 4 functions that weight bearing limb accomplishes?
1. propulsive force
2. upright stability is maintained
3. shock of floor impact at the onset of each stride
4. energy is conserved by these functions being performed( reduced muscular effort)
How is passive stability achieved?
- achieved when the C of G of one segment is aligned directly over the center of the supporting joint.
What determines the resultant vector of force for locomotion?
- vertical force
- medial-lateral horizontal force
- anterior-posterior horizontal force
What is the "moment" of a joint?
- movement that the GRFV wants the joint to perform.
What determines the ground reaction force vector?
- alignment of body weight
- during standing and walking; effect of body weight is identified by the GRFV.
What is the muscle activity for the moment of the joint?
- eccentric (antagonist)
- passive (screw home mech)
What is the muscle activity of the moment that doesn't result in the desired motion?
- concentric (of the agonist)
What is the primary muscle activity of the legs during the stance phase? What is the importance of this activity?
- eccentric -
- maintain stability, promote shock absorption, conserve energy, and generate propulsive force
What is the primary muscle activity of the legs during the swing phase? What is the importance of this activity?
- move the limb, generate momentum that contributes to propulsive forces.
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