Causes of Poor Posture - Class 7 Flashcards
causes for poor posture
positional
structural
positional
general poor posture habits
general poor posture habits could be d/t
muscle imbalances
pain
respiratory changes
concerns of body image
occupation
muscle imbalances –> commonly held clinician perception
postural alignments produce adaptive changes in the muscles surrounding misaligned joints
muscles on one side of the joint are held in a
lengthened positions
agonist muscles
antagonist muscles on one side of the joint are held in a
shortened position
what do these length changes produce
joint impairments
joint impairments
weakness
limited ROM
–> contribute to a pt’s complaints
what has research on animals shown
prolonged length changes in a muscle produce structural changes in the muscle
what does prolonged stretch of a muscle induce
protein synthesis
production of mores sarcomeres
as a result of protein synthesis
muscle hypertrophies
peak contractile force increases w/ prolonged stretch
what does remodeling maintain
original length-tension relationship
muscle will just generate the peak torque at a different joint position
what is considered: muscle will just generate the peak torque at a different joint position
stretch weakness
stretch weakness
when the muscle has been held in a stretched position long enough to remodel
how will a stretch weakness muscle appear
weak when tests in the traditional test position
changes associated w/ stretch weakness are
logical but unproven
prolonged shortening –> animal studies
shortening produced by immobilization appears to accelerate atrophy
muscles demonstrate a loss of sarcomeres
length tension relationship
effect of muscle length and the amount of tension produced
optimal relationship b/w length and tension
joint position where the muscle can generate the greatest amount of tension with least amount of effot
agonist and antagonist relationship
body relies on the excitatory/inhibitory reflex loop b/w the 2 muscle groups
for smooth deliberate movement of the body
muscle imbalances are characterized by
an impaired relationship b/w a muscle that is overactivated, subsequently shortened and tightened
and
another that is inhibited or weak
what can cause a muscle imbalance
nerve pathology
pain
joint effusion
poor posture
repetitive activity of one muscle group
postural muscles
tonic
primary fxn to support the body against forces of gravity
what are tonic muscles composed of
higher percentage of slow twitch muscle fibers
slower to fatigue