Before the Space Shuttle program, Apollo astronauts reported difficulty in donning their space suits inflight and on the moon.

The first documented changes in height during weightlessness were on Skylab 4 and ASTP.

RESULTS: There were many obvious changes in limbs, spine, and peripheral tissue.

As to the locations of internal organs, auscultation was not only possible under the noise conditions in the Shuttle, but also very useful.

Preflight and postflight measurements were made in a similar fashion. Measurements were made preflight during physical exam, inflight daily, and on landing day R 0.

On STS-51D, height measurements were made using the precision gauge ( 1mm) designed by Whitmore.

LET spectra was measured using CR-39 PNTDs that were placed on the APDs.

The CR-39 plates were etched with a Na OH solution and read out on an image digitizer system and analyzed.The differences in the high and low values were most likely caused by shielding differences due to the individual APD placements on Mir.Also, secondary target fragments, generated by inelastic scattering of protons and alpha particles within the detector medium, contributed to the spread of values.The crewmember performed the usual manual physical examination procedures to define and outline locations of major organ systems preflight and on orbit.It was desired that each crewmember be examined before and during flight.RESULTS: By using identical APDs in the exact locations on Mir, changes in radiation levels over time were recorded and analyzed.