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demonstrated the utility of static ultrasound in human centrifuges for many decades, with early reports of transcranial Doppler during centrifuge to detect cerebral blood flow and anticipate hypergravity-related events such as G-induced loss of consciousness (G-LOC) and effectiveness of anti-G straining maneuvers (AGSM). 4 , 12 , 23 Asynchronous vascular evaluation, with ultrasound imaging before and after centrifuge exposure, has similarly been used to correlate AGSM effectiveness to risk of G-LOC or evidence of hypergravity tolerance. 1 , 2 , 5 Static ultrasound has been