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KMID : 0376219830200030513
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Chonnam Medical Journal
1983 Volume.20 No. 3 p.513 ~ p.520
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Tolerance to Positive Acceleration Forces in Korean Young Adults
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Abstract
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The present study was undertaken to determine the tolerance of Korean male adults to positive acceleration forces and to evaluate the effects on the physiological responses during rapid or slow-onset runs.
One hundred and sixteen young male healthy adults were exposed to positive acceleration. Among 116 subjects, 54 were exposed to the rapid-onset run(ROR) of which acceleration rate was 0. 8G/sec, and 62 to the slow-onset run(SOR) of which acceleration rate was 0. 1G/sec. The positive acceleration force of human centrifuge was step wisely increased from 3 Gz to the tolerably high +Gz(7+Gz). The human centrifuge running was stopped at the sign of black out phenomenon of the subject. The changes of heart rates, electrocardiogram, and respiratory rates were checked to evaluate the cardiovascular effects of positive acceleration. The results obtained were as follows.
1. In the ROR group(54), 14.8% tolerated to 7+Gz acceleration, whereas 56.5% in the SOP, group(62).
2. Tolerance to positive acceleration of the subjects was 5.2 ±1.0+Gz in ROR group, SOR group, respectively.
3. In both groups, the changes of heart rate in high tolerance subjects were less than those in lower tolerance subjects at the same +Gz level.
4. In both groups, the electrocardiogram frequently showed peaked P-wave and flattening or inversion of T-wave, and other abnormal findings such as premature atrial beat, premature ventricular beat and sinus arrhythmia.
5. In both groThese results indicate that positive acceleration tolerance of the SOR grout is higher than that of the ROR group, and the changes of heart rate in high tolerance subjects were less than those in lower tolerance subjects at the same +G2 level in both groups.ups, respiratory rates increased up on high positive acceleration.
These results indicate that positive acceleration tolerance of the SOR group is higher than that of the ROR group, and the changes of heart rate in high tolerance subiects were less than those in lower tolerance subjects at the same +Gz level in both groups.
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