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      A Digital Rheoplethysmographic Study of the Vasomotor Response to ‘Simulated Diving’ in Man



      S. Karger AG

      Simulated diving, Orienting reflex, Dive reflex, Digital blood flow, Heart rate, Vasoconstriction

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          The digital rheoplethysmogram was recorded from 10 normal human subjects during the act of ‘simulated diving’, i.e. submersion of the face in a pan full of water. Digital vascular responses to various maneuvers and stimuli associated with simulated diving were also studied. In general, digital vasoconstriction was seen after most maneuvers and stimuli associated with the diving phenomenon (other than placing the face in water itself). The response of the pulse rate was variable, although a decrease was usually seen as much during ‘simulated diving’ without water in the pan as with water. Decreasing the temperature of the water exaggerated the responses to most stimuli. Digital vasoconstriction was produced by audio stimulation (bell) and deep inspiration, whereas a variable effect on pulse rate was produced. The role of psychic factors and ‘orienting reflexes’ in the production of the cardiovascular response to diving are discussed. It is concluded that respiratory, thermal and psychic factors all play a role in the physiologic response to ‘simulated diving’ and that wetness is only a contributing factor.

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          Author and article information

          S. Karger AG
          29 October 2008
          : 55
          : 5
          : 257-271
          Department of Medicine of the Tulane University School of Medicine and the Charity Hospital of Louisiana, New Orleans, La.
          169290 Cardiology 1970;55:257–271
          © 1970 S. Karger AG, Basel

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          Page count
          Pages: 15


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