DIURNAL VARIATIONS IN BLOOD SPECIFIC GRAVITY IN NORMAL DOGS AND HUMANS

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Abstract
Using the extremely sensitive falling drop method of Barbour and Hamilton, the authors studied the diurnal variations in the specific gravity of blood of humans and dogs. The general average of 118 observations on 6 normal men was 1.0565; of 92 observations on 7 normal women it was 1.0533. The highest figures obtained for men ranged from 1.0560 to 1.0596, averaging 1.0579; the lowest figures for the same individuals were 1.0526-1.0561, averaging 1.0545. Corresponding figures for females were lower; high, 1.0517-1.0569, averaging 1.0548; low, 1.0499-1.0541, averaging 1.0521. The average maximum variation during the day for men was .0033 and for women .0027. The specific gravity falls following the ingestion of an ordinary mixed meal and after gentle exercise, but rises after moderate or severe exercise. The highest specific gravity is found just before breakfast and the lowest at night after dinner; the specific gravity differs considerably in different persons and varies from day to day in the same individual.

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