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J Appl Physiol 16: 1078-1080, 1961;
8750-7587/61 $5.00
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Heart rate and forward acceleration

Sheldon H. Steiner 1 and Gustave C. E. Mueller 1

1 Acceleration Section, Aerospace Medical Laboratory, Wright Patterson Air Force Base, Dayton, Ohio

Cardiac rate was measured in six human subjects during forward acceleration at 8 g and compared with changes in head position while maintaining the remainder of the body in the same position. There was no change in cardiac rate for the 20-sec duration of the plateau with the head in a neutral position (fully supine). The heart rate increased 20% with the head elevated and decreased 16% with the head depressed. Changes in rate are produced by altering the position of the carotid baroreceptors in relation to those located in the trunk, presumably due to alterations produced by acceleration forces in the perfusion pressures in the carotid arteries.

Submitted on February 27, 1961






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