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EXPERIMENT INFORMATION

Anticipatory Postural Activity (POSA) (4.2.4b)
Principal Investigator
Research Area:
Muscle physiology
Neuroscience
Species Studied
Scientific Name: Homo sapiens Species: Human

Description
OBJECTIVES:
Gravity supplies a frame of reference for the human sensory-motor response. In the absence of gravity, such as during space flight, several systems are hindered. These disturbances are compensated for by the brain, and ultimately, the body adapts to the weightless environment. Balance and locomotion functions are temporarily disturbed after return to Earth, but eventually return to preflight levels. Postural problems reported by crewmembers include increased sway while standing, difficulty in rounding corners and increased body movement during locomotion. This investigation assessed the impact of microgravity on neuromuscular anticipatory postural activity and examined the changes, intending to provide a better understanding of balance and locomotion in humans and to design countermeasures which could reduce the time course of readaptation to 1-g.

The five objectives examined during this study were:

(1) Determine how long-duration space flight altered the anticipatory neuromuscular activity associated with arm movement.

(2) Perform proof-of-concept research to determine whether foot sensory input modified neuromuscular responses during space flight.

(3) Determine the time course of adaptation during long-duration space flight to foot sensory input as measured by patterns of neuromuscular activation.

(4) Determine whether long-duration space flight modified anticipatory neuromuscular postural activity in the immediate postflight period.

(5) Determine whether modifications in anticipatory neuromuscular postural activity associated with long-duration space flight were correlated with postural instability immediately after landing and during the recovery period.


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Publications
Layne C. Anticipatory postural activity (Posa): Mir 18 final science report. In: Shuttle-Mir Science Program Phase 1A Research Postflight Science Report, Houston TX: National Aeronautics and Space Administration Lyndon B. Johnson Space Center; 1998, March.

Layne C. Anticipatory postural activity (Posa): Mir 19 final science report. In: Shuttle-Mir Science Program Phase 1A Research Postflight Science Report, Houston TX: National Aeronautics and Space Administration Lyndon B. Johnson Space Center; 1998, March.

Layne CS, Mulavara AP, Pruett CJ, McDonald PV, Kozlovskaya IB, Bloomberg JJ. The use of foot pressure as a countermeasure to neuromuscular degradation. Acta Astronautica. 1998; 42(1-8):231-246.[pubmed.gov]

Layne CS1, Mulavara AP, McDonald PV, Pruett CJ, Kozlovskaya IB, and Bloomberg JJ. Effect of long-duration spaceflight on postural control during self-generated perturbations. Journal of Applied Physiology. (1985). 2001 March; 90(3):997-1006. [pubmed.gov]

Keywords
Posture

Data Information
Data Availability
Archive is complete. Some data sets are online.
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Parameters
Arm acceleration
Center of pressure
Foot pressure
Postural control
Posture

Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
Mir 18 03/14/1995 07/07/1995 116 days
Mir 19 06/27/1995 09/11/1995 76 days
STS-71 06/27/1995 07/07/1995 10 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Johnson Space Center LSDA Office
Project Manager: Jessica Keune
Institutional Support
National Aeronautics and Space Administration (NASA)