6Stevens PM, Lamb LE. Effects of lower body negative pressure on the cardiovascular system[J]. Am J Cardiol, 1965;16:506-515.
7Ueno T, Yoshimoto S, Mayanagi Y, et al. Effects of lower body negative pressure on cerebral circulation [J]. Aviat Space Environ Med,1993;64(11):1006-1010.
8Balldin UI, Krock LP, Hopper NL, et al. Cerebral artery blood flow velocity changes following rapid release of lower body negative pressure [J]. Aviat Space Environ Med,1996; 67(1):19-22.