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Healthy adults in the ranges of from 22 to 25 years old, 208 males and 140 females respectively, who have no specific organic diseases in the heart and lung, were experimentally studied on the effect of blood pressure, pulse and breath rates, and blood circulation by the postural changes of the supine, semi-supine, upright, sitting and trendelenburg position. The results obtained were as follows : 1) The blood pressure showed makred differences in the postural changes of the upright>sitting>semisupine>trendelenburg>supine position, orderly. 2) The breath rate did not show specific findings in the postural changes. 3) If the dental chair were suddenly tilted forwardly and backwardly, patients would be subjected to fall in the dangerous state, fainting. |
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