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STS-55 Pilot Henricks with baroreflex collar in the Spacelab D2 science module onboard Space Shuttle Columbia

(May 6, 1993) Terence T (Tom) Henricks (b 1952), STS-55 pilot, wears a special collar for a space adaptation experiment in the science module onboard the Earth-orbiting Space Shuttle Columbia
(OV-102). The Baroreflex experiment was designed to investigate the theory that lightheadedness and a reduction in blood pressures on standing after landing may arise because the normal reflex system regulating blood pressure behaves differently after having adapted to a microgravity environment. These space-based measurements of the baroreflex were compared to ground measurements to determine how microgravity affects the reflex. (Source: NASA/Johnson Space Center [Houston]. NASA ID: STS055-233-019. Public domain.)