Journal of Applied Physiology AJP: Regulatory, Integrative and Comparative Physiology
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J Appl Physiol 19: 955-958, 1964;
8750-7587/64 $5.00
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Specific gravity of human subjects by air displacement and helium dilution

V. M. Hix 1, A. M. Pearson 1, and E. P. Reineke 1

1 Departments of Food Science and of Physiology and Pharmacology, Michigan State University East Lansing, Michigan

Body volumes for 24 men and 24 women were determined using both the air-displacement and helium-dilution procedures. Specific gravity values were calculated and computed. The two methods of determining body volume showed extremely good agreement, with a correlation of 0.99 for both men and women. The correlation between specific gravity values was 0.96 for men and 0.91 for women. Thus, the over-all agreement between the two methods was relatively good, although the mean deviation was relatively large. The major sources of error for the helium-dilution procedure appeared to be due to changes in temperature, to irregular accumulation of carbon dioxide within the chamber, and to difficulty in setting the current to the thermal conductivity cell at precisely the same level. The major sources of error in the air-displacement method seemed to be due to changes in temperature, changes in relative humidity, and lack of precision in making pressure readings on the manometer.

body composition; body volume by air displacement; body volume by helium dilution; specific gravity measurements

Submitted on October 28, 1963




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