title: Countermeasures: extending manned spaceflight. Special issue.
mesh_terms: D000337:Aerospace Medicine; D018480:Astronauts / Q000523:psychology; D005081:Exercise Therapy; D018470:Gravity, Altered; D006801:Humans; D008150:Lower Body Negative Pressure; D009747:Nutritional Physiological Phenomena; D011835:Radiation Protection; D013026:Space Flight; D014893:Weightlessness / Q000009:adverse effects*; D018544:Weightlessness Countermeasures