title: Balance studies of astronauts.
mesh_terms: D001842:Bone and Bones / Q000000981:diagnostic imaging; D002118:Calcium / Q000378:metabolism* / Q000652:urine; D004032:Diet; D005243:Feces / Q000032:analysis; D006801:Humans; D008297:Male; D005082:Physical Exertion; D011188:Potassium / Q000378:metabolism; D011859:Radiography; D012964:Sodium / Q000378:metabolism; D013026:Space Flight; D013542:Sweat / Q000032:analysis; D014893:Weightlessness
chemical_list: D012964:Sodium; D011188:Potassium; D002118:Calcium