Gemini 4 Experiment Debriefing, 1967

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6.
M-4, In-Flight Phonocardiogram
The purpose of this experiment is
to measure the fatigue-stage of an
astronaut's heart muscle during a
long-duration flight. A microphone
wi ll be applied to an astronaut's
chest wal I at the cardiac apex.
Heart sounds detected during the
flight will be recorded on an on­
board biomedical recorder. The
sound trace wi 11 be compared to
the waveform obtained from a
simultaneous infl ight electro­
cardiogram to determine the time
interval between electrical
activation of the heart muscle
and the onset of ventricular
systrole.
Figure 8 illustrates the
method of installation of the phono­
cardiogram transducer.
7.
M-6, Bone Demineralization
The purpose of this experiment
is to establish the occurrence
and degree of bone demi nera Ii­
zati on resulting from prolonged
weightlessness during spaceflight.
Spec ia I X-rays wi 11 be ta ken of
an astronaut's heel bone and the
terminal bone of the fifth digit
of the right hand.
Three pre­
flight and three postflight
exposures wi 11 be taken of these
two bones and compared to
determine if any bone deminerali­
zation has occurred due to the
space flight. Figure 9 i 11 ustrates
the laboratory procedure which will
be used for this experiment.
M-913-65-04
M-4 IN-FLIGHT
PHONOCARDIOGRAM
PROTOTYPE PHONOCARDIOGRAM
TRANSDUCER AND
SIGNAL CONDITIONER
FIG . 8
GEMINI EXPERIMENT NO. M·&
BONE DEMINERALIZATION
ESTABLISH DEGREE
PURPOSE
OF BONE
DETERIORATION
EQUIPMENT STANDARD X-RAY
WEIGHT
N/ A VOLUME N/ A
PRE AND POST
PROCEDURE
FLIGHT x-RAY
LOCATION
N/ A
i
"
'
MG4-1886
FIG. 9
5/24/65
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