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This well written monograph is based on continuous studies with the cardiotachometer, conducted on 356 persons over periods of from twelve to twenty-four hours. An interesting historical review of pulse mensuration introduces the work. This is followed by an intimate, lucid description of the cardiotachometer, the technic of cardiotachometry, the difficulties encountered in its use, and the means of obviating these. The normal heart rate during waking hours, the basal rate, the minimum rate, the range of normal heart rate, the rate during sleep, the effect of exercise, eating, body functions and mental and emotional activities on heart rate, the rate during various anesthetics and operations and the rate in organic and functional heart disease and in exophthalmic goiter are appropriately discussed and correlated with a review of the pertinent literature. Historical touches are included from time to time. Their observations give a more truly representative picture of the heart
The Heart Rate. JAMA. 1932;99(18):1536. doi:10.1001/jama.1932.02740700076044
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