The bed we will ask participants to lie on is called a Lower Body Negative Pressure Bed. When lying on this bed the participants’ legs will be inside a see through plastic dome. A belt will be placed around the participants’ waist in order to create an airtight seal around their legs. The bed is attached to a vacuum that allows us to create a low pressure environment around participants’ legs. This causes blood to pool inside the veins of participants’ legs. This leads to Acute Volume unloading of the right and left heart chambers.