title: Introduction.
authors.affiliation: Department of Community Medicine, Wright State University, Dayton, OH 45401, USA.
authors.forename: H
authors.initials: H
authors.lastname: Sandler
authors.forename: J
authors.initials: J
authors.lastname: Vernikos
authors.forename: H M
authors.initials: HM
authors.lastname: Wegmann
authors.forename: K E
authors.initials: KE
authors.lastname: Klein
mesh_terms: D000222:Adaptation, Physiological; D000337:Aerospace Medicine; D001794:Blood Pressure; D003359:Cosmic Radiation; D018495:Fluid Shifts; D006801:Humans; D008150:Lower Body Negative Pressure; D013026:Space Flight; D018489:Space Motion Sickness; D014893:Weightlessness / Q000009:adverse effects*; D018544:Weightlessness Countermeasures