posture Flashcards
posture is the
alignment of the various body segments
postural body segments
the joints involved in weight bearing (spine, pelvis, hip, knee, ankle, foot etc)
different postures are the result of
variations in the alignment of body segments
What is unique to man
the ability too maintain an erect, upright posture
upright posture enables the use of
UE to interact with the environment
disadvantages of upright posture:
- incr heart work
- incr stress on vert column, pelvis & LE
- decr stability (high COG over small BOS)
location of COG
s2
in the optimal standing posture, line of gravity falls close to but not through most:
joint axis
the position of the line of gravity influences
torque around a joint
ex: if the line of gravity is in front of the body, the body will want to move forward
Is muscle activity needed to have an erect posture?
some muscle activity is necessary to maintain erect posture
Majority of support required for posture comes from:
bones, joints, ligaments
the line of gravity anterior to a joint will result in
anterior motion of the proximal segment
line of gravity posterior to a joint will result in
posterior motion of the proximal segment
primary antigravity muscles:
- hip & knee extensors
- trunk & neck extensors
secondary antigravity muscles:
- trunk & neck flexors
- lateral flexors
- hip abductors/adductors
- ankle pronator/supinators
postural sway
constant movement of the center of gravity over the BOS
postural sway is managed by:
ankle plantarflexion & dorsiflexion
what increases postural sway??
high COG with a small BOS (ex: standing on tip toes or on one foot)
what is important for maintaining alignment and mitigating stress placed on body???
good posture
Posture ______ the muscle energy needed to keep the body _______ at rest & during activities
decreases;
upright;
the position of the pelvis influences the _________, especially at the ________
vertebral column
lumbar region
Neutral pelvis is when:
the ASIS & PSIS are level (coronal plane)
ASIS aligned with pubic symphysis vertically
pelvis anterior tilt increases:
the lumbar curve (lordosis)
pelvis posterior tilt increases:
the lumbar curve (kyphosis)
