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Physiological Mass Measurements in Skylab (M172)
Principal Investigator
Research Area:
Metabolism and nutrition
Species Studied
Scientific Name: Homo sapiens Species: Human

The Body Mass Measurement experiment consisted of preflight and inflight calibrations, Special Tests, and Routine Mass Measurements of the crew. The BMMD was calibrated a number of times during the preflight period with calibration weights that were later used for inflight calibrations. The preflight and inflight calibration data were compared and then used to calculate a correction factor for the gravitational force that influenced the preflight measurements. The Special Tests were designed to verify the operation of the BMMD and the accuracy of the measurements. The tests included BMMD Repeatability, BMMD Mass Stability, BMMD Subject Repeatability, and the BMMD Subject Stability Test. The repeatability tests examined the accuracy of the BMMD by focusing on its ability to produce consecutive and equal measurements for the same object. The stability tests investigated how measurement accuracy was affected by excessive movement of the subject. The Routine Mass Measurements were the daily mass measurements of the crewmembers and these were recorded each morning immediately after urination. The same type of clothing of known mass was worn each day and any extra items were removed from the pockets.

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Thornton WE, Ord J. Physiologic Mass Measurements in Skylab. In: Johnson RS, Dietlein L, eds. Biomedical Results from Skylab. Washington, DC: NASA Headquarters; 1977:175-81. NASA SP-377. [NTRS]

Thornton WE, Ord J. Physiologic Mass Measurements in Skylab. In: JohnstonRS, Dietlein LF, editors. Proceedings of the Skylab Life Sciences Symposium; 1974 Aug 27-29; National Aeronautics and Space Administraion, Johnson Space Center; 1974373-86. Report No: JSC-09275, Report No: TM X-58154. [NTRS]

Body weight

Data Information
Data Availability
Archive is complete. No data sets are available for this experiment. Please Contact LSDA if you know of available data for this investigation.

Weight, body

Mission/Study Information
Mission Launch/Start Date Landing/End Date Duration
Skylab 2 05/25/1973 06/22/1973 28 days
Skylab 3 07/28/1973 09/25/1973 59.5 days
Skylab 4 11/16/1973 02/08/1974 84 days

Additional Information
Managing NASA Center
Johnson Space Center (JSC)
Responsible NASA Representative
Institutional Support
National Aeronautics and Space Administration (NASA)