Which space agency designed the Bed Rest research to study the effects of prolonged exposure to micro-gravity?

Which space agency designed the Bed Rest research to study the effects of prolonged exposure to micro-gravity?
[A]ISRO
[B]NASA
[C]ESA
[D]NAOA

NASA
The US space agency NASA designed the Bed Rest research to study the effects of prolonged exposure to micro-gravity. Under this study participant requires to remain horizontal for a period of 70 days. In the study, scientist will gauge how effect exercise would be for astronauts who lose muscle, cardiovascular and bone function while in zero gravity conditions.

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