Adaptations in microgravity Flashcards
what is the difference in SC canal function in space
SC canals will function normally for the most part
inerita still exists in space (can still have angular acceleration and rotation)
what is the difference in otolith organ function in space
no longer static tilting of the head relative to gravitational vertical
- still respond to linear head accelerations
how is horizontal VOR gain calculated
eye rotation (deg) / head rotation (deg)
what are the changes in HVOR gain over spaceflight
gain of HVOR goes way up during the first few days of flight
- returns to baseline in a week
what are the changes in VSR gain over spaceflight
goes way down during space flight
what are the changes in balance over return from spaceflight
disrupted upon return to earth
- re adapts over about 200 hours (8.5 days)
what is sensory reweighting
brain re weights amount of attention it pays to specific senses
what are postural stabiliograms
show where pressures are under your feet when asked to stand still
measure postural stability
what do postural stabilograms show after returning from spaceflight
amount they sway around immediately after returning is elevated relative to before
- goes down a few days after returning
what did the subgroup of “hypersensitive” astronauts show
increased foot sole vibration sensitivity
exceptionally poor performance on the vestibular SOT5
- shows that reduction of vestibular function was being offset by an adaptation of foot sole cutaneous function in space (vestibular reweighted faster)
