Intermittent short-arm centrifugation is a partially effective countermeasure against upright balance deterioration following 60-day head-down tilt bed rest by De Martino, E, Salomoni, SE, Hodges, PW, Hides, J, Lindsay, K, Debuse, D, Winnard, A, Elliott, JM, Hoggarth, M, Beard, D, Cook, JA, Ekman, R, Hinterwaldner, L, Scott, J, Weber, T, Caplan, N