TY - RPRT TI - Effect of intermittent standing and walking on physiological changes induced by head-down bed rest AU - Vernikos, J. AU - Ludwig, D. A. AU - Ertl, A. C. AU - Wade, C. E. AU - Keil, L. AU - OHara, D. PY - 1994 UR - https://ntrs.nasa.gov/citations/20010122937 ID - 20010122937 ER -