Thyroid Activity and Heart Rate.
- 1 February 1962
- journal article
- research article
- Published by Frontiers Media SA in Experimental Biology and Medicine
- Vol. 109 (2) , 284-287
- https://doi.org/10.3181/00379727-109-27179
Abstract
Summary Beat rate determinations were made of the hearts of euthyroid, thyroxinized and triiodothyroninized rats in vivo and of atrial preparations of correspondingly treated (except for thyroxine) animals in vitro. A close parallelism was found between in vivo and in vitro experiments. Durations of the effects of thyroxine and triiodothyronine were equal. In radiothyroidectomized animals the rate of beat in isolated atria was less than 60% of that of euthyroid atria although no significant differences were observed in the heart rates of intact hypo- and euthyroid animals.Keywords
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