Ground Based Study: VaPER
The VaPER (VIIP and Psychological :envihab Research) study consisted of four investigations sponsored by NASA's Human Research Program in partnership with the German Space Agency (DLR). VaPER was carried out at the Institute of Aerospace Medicine’s :envihab facility in Cologne, Germany.
The investigations were designed to study the effects of fluid pressure on astronauts’ eyes and optic nerves. Six-degree head down (HDT) bed rest was used to simulate microgravity conditions, while a hypercapnic environment was used to simulate the increased level of carbon dioxide that is found on the International Space Station.
A total of 11 subjects underwent two weeks of training and baseline data collection, 30 days of data collection while experiencing HDT bedrest in a 0.5% carbon dioxide atmosphere, and concluded their participation with two weeks of post bed rest data collection.