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Antihypotensive Garment
Hardware Type
Space Suit Equipment

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The waist-length elastic leotard used for the Apollo 16 flight was designed to produce a pressure of 40 to 45 mmHg at the ankle that decreased linearly to approximately 10 mmHg at the waist. To accommodate the reduction in limb size expected to occur during flight, garments in three sizes were made for the subject. They were 0.5, 1, and 1.5 cm smaller in circumference at the calf with proportionate reductions throughout the lower limb.

A lower-body garment using the capstan principle to apply pressure to the lower limbs was designed, fabricated, and sized for the Apollo 17 subject to use after splashdown. The capstan pressure was read from an aneroid gauge and the capstan was inflated with a hand bulb; both gauge and bulb were concealed in a zippered pocket. The capstan exerted the pressure of the garment over the skin at the ankle in a 2:1 ratio from ankle to waist. This pressure diminished linearly to approximately 10 mmHg at the waist. Preflight testing with pressure sensors between the garment and the skin verified the ratio and the diminishing gradient of pressure from ankle to waist. To accommodate the anticipated loss of limb girth, laces were provided for reducing the garment size slightly before stowage of the garment in the command module. The capstan itself accommodated moderate changes (±2.5 cm) in girth.

Versions of this Hardware
+ Version Used During the Apollo Missions