Be2

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The noise effect annoyed them, especially at res •. Beginning with the third to fourth days of the experiment the physician reported ear blockage and hearing loss which he observed during auscultation and arterial blood pressure measurements. By the second month of the experiment, the test subjects developed a kind of adjustment; however, they failed to adapt completely to the noise effects until the very end of the experiment. It is interesting to note that an insignificant increase of the sound level to which the test subjects had adapted was perceived as a sharp elevation of the loudness level.

Representative changes of blood pressure during lower body negative pressure (LBNP) testing, preflight and postflight (2 hr after recovery). 140 130 120 SYSTOLIC lIO 100 BLOOD PRESSURE, mm Hg 90 BO DIASTOLIC 70 ---PREFLIGHT MEAN -POSTFLIGHT. 5 HOURS 60 50 0 10 TIME, MINUTES Fig. 16. - hr after recovery). SUMMARY OF MEDICAL EXPERIENCE IN THE APOLLO 7-11 27 MANNED SPACEFLIGHTS Program. Calf circumference changes were measured during LBNP testing in the 9 crewmembers from the Apollo 7 through 9 missions.

Hearing variations changed distinctly from individual to individual. The masking thresholds, air conduction, were about 35 to 40 dB in the most stable test subject and about 50 to 65 dB in the least stable one. The three subjects displayed a positive recruitment phenomenon. According to the audiometry data, the year-long experiment can be conditionally divided into three periods: First period (2 months) - characterized by an increase of the masking thresholds and differential thresholds of sound intensity and frequency.

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