Adjustments of the Circulation to Orthostatic Reaction and Physical Exercise During the First Trimester of Primipregnancy

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Abstract
The orthostatic pulse reaction, physical working capacity on the bicycle ergometer, total haemoglobin content and the heart volume in the supine position were determined on two different occasions in ten primigravidae, all of whom were in the first trimester of pregnancy at the first examination. The second examination was performed 2 weeks after legal abortion. The orthostatic reaction on standing upright for a period of 8 min was more pronounced during pregnancy than following abortion. The physical working capacity at a pulse rate of 170/min was lower during pregnancy than 2 weeks after abortion. There was no difference in the heart volume in the supine position, nor in the total haemoglobin content at the times in question. The circulatory haemodynamics seem to be changed in early pregnancy so as to resemble those of the vasoregulatory asthenia syndrome.

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