Principle approaches to selection of the short-arm centrifuge regimens for extended space flight.

Eight +Gz regimens on the SAC varying in their values (within 0.8 to 1.6 G), exposures, schedules, etc. were analyzed. Some regimens were combined with water-salt supplements (WSS) or veloergometer training (VE). Weightlessness was simulated by 3- to 28-day water immersion. +3 Gz loads on the centrifuge with the radius of 7.5 m were applied prior to and post immersion. Regimens for human runs on the SAC as a novel, perspective countermeasure for interplanetary expeditions should be selected with due regard of the human tolerance, their efficiency, and subsequent verification and specification in orbital flights. These approaches showed that 3 days of exposure to 1.2 G combined with WSS and 6 days of exposure to G-loads from 0.8 to 1.6 G together with VE were most optimal.