LECTURE 4: posture Flashcards
What is defined as orientation or alignment of the human body
posture
where should the COM and LOG be maintained
within the base of support
what is defined as process by which upright posture is maintained
balance
in standing where is the BOS and COM
BOS : heels to toes
COM: S2 level
in sitting where is the BOS and COM
BOS: feet boundaries + chair
COM: just below the axilla
postural control requires neuromuscular integration of
PNS and CNS
which systems play a role in postural control
visual, vestibular , somatosensory , and musculoskeletal system
what are the 2 primary mechanisms to maintain stability
anticipatory postural adjustments
compensatory postural adjustments
what adjustment precedes actual movement amd is based on experience and sensory integration
APA
what adjustment responds to sensory feedback and strategies to restore balance/ posture control;
CPA
what helps regulate APAs
vision
what responds to changes in orientation of head and trunk in space
vestibular
what gives feedback with regard to surface
somatosensory
is static posture always a single point
no
is sitting or standing a more stable situation
sitting bc larger BOS and lower COM
less postural sway
where is the most sway observed
in anterior posterior directions
does anticipatory postural adjustments happen before or after anticipatory synergy adjustments
after
when does APA occur
100 ms prior to planned movement
when does anotopatory synergy adjustments occur
250-300 ms prior to planned movement
what are the two distinct patterns of anticipatory synergy adjustments
maintain motor output predictive of the intended task and to provide muscle activation that allows for movement to occur