The physiologic responses of the circulatory system to changes in posture were first studied in animals by Hill and Barnard1 in 1897. They found, by placing a dog in the vertical position, feet down, and cutting the cervical portion of the spinal cord, that the pressure in the aorta dropped to zero and most of the blood was collected in the splanchnic region. By squeezing the abdomen the aortic pressure returned to normal. Hill and Barnard also demonstrated that if rabbits raised in a hutch were placed in a vertical position, feet down, the animals would die in a very
R. G. POSTURE AND BLOOD PRESSURE. Ann Intern Med. ;9:638–640. doi: 10.7326/0003-4819-9-5-638
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Published: Ann Intern Med. 1935;9(5):638-640.
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