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KMID : 0383119660140020029
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Journal of Aerospace Medicine
1966 Volume.14 No. 2 p.29 ~ p.36
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Experimental Studies on the Tolerance of Living Body to G-force
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Abstract
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Nowadays the velocity of air craft increased unlimitedly, and accompanying to this great achievement physiological problems of visual disturbance, dyspnea and even unconsciousness became important things that should be solved.
The purpose of this study is to clarify the factors which may contribute the specific difference of G tolerance. The difference of G tolerance in ´homeothermal animals including mammals and birds was compared. The tolerance of animals to G. forces, including positive G, negative G and transverse G. was examined using animals centrifuge. Magnitude of G and exposure time was within 130 G and 20 minutes.. The changes of tolerance according to the direction of G-force were compared. And the tolerance of each animals to each direction was expressed as a mathematical formula.
In the tolerance curves, the relationship of the two principle action factors between strength (G) and duration (t) was expressed as G= t +a, where a, and -c, are constants for each species of animals.
The tolerance of each species of animals was compared with F, the area under tolerance curve, within aforementioned G and t values.
In. the comparison of the tolerance of animals to each direction of G-forces, transverse G (-Gx) tolerance is 2.12 times and negative G (-Gz) _ is 0.58 time greater than . that of positive G (+ Gz).
In the above relationship it was observed that the uniform changes of tolerance was present according . to., the changes of direction of - G-force in each species of animals.
A predicting nomogram of G-tolerance to prolonged acceleration on each species of animals was established, from -a. given body weight. Body weight is found to have a significant ´relationship to -G tolerance.
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