Task Evaluation of Commercial Compression Garments as a Countermeasure to Post-Spaceflight Orthostatic Intolerance (OIG DSO641) (ACG Shuttle-Platts, Completed) (Completed)
Last Published:  07/29/22 01:33:24 PM (Central)
Short Title: Alternative Compression Garments
Responsible HRP Element: Human Health Countermeasures
Collaborating Org(s):
Funding Status: Completed - Task completed and produced a deliverable
Procurement Mechanism(s):

One of the most important physiological changes that may negatively impact crew safety is post-flight orthostatic intolerance. Astronauts who have orthostatic intolerance are unable to maintain a normal systolic blood pressure during head-up tilt, have elevated heart rates and may experience presyncope or syncope with upright posture. This problem affects about 30 percent of astronauts who fly short-duration missions (4–18 days) and 83 percent of astronauts who fly long-duration missions. This condition creates a potential hazard for crew members during re-entry and after landing, especially for emergency egress contingencies.

Two countermeasures are currently employed to ameliorate post-flight orthostatic intolerance; fluid loading and an anti-gravity suit. Unfortunately, neither of these are completely effective for all phases of landing and egress; thus, continued countermeasure development is important. Preliminary evidence has shown that commercial compression hose that include abdominal compression can significantly improve orthostatic tolerance. These data are similar to clinical studies using inflatable compression garments.

Custom-fitted, commercial compression garments will be evaluated as countermeasures to immediate and longer-term post-flight orthostatic intolerance. These garments will provide a continuous, graded compression from the foot to the hip, and a static compression over the lower abdomen. These garments should provide superior fit and comfort as well as being easier to don. Tilt testing will be used as an orthostatic challenge before and after spaceflight.

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