[Dynamic responses of human body and human surrogate to different impacts under 30 degrees supine position].
OBJECTIVE
To study the difference between the dynamic responses of human body and human surrogate under 30 degrees supine position, and to discuss impact probability of substituting human body with human surrogate in impact tests.


METHODS
Five volunteers experienced half-sine impact pulses, averaged 4.76, 8.96, 11.33 G, lasting for 40-60 ms on an impact tower. The human surrogate was exposed to half-sine impact pulses, averaged 6.77, 10.39, 16.93, 21.11, 24.98, 31.11 G, lasting for 40-60 ms, two times for each G level. ECG changes of the volunteers were continuously monitored before, during and after each impact.


RESULTS
Output responses at forehead and chest of human body and human surrogate increased with input increments. But there was obvious difference of the dynamic responses between human body and the surrogate to impact of low G levels. Heart rate of each volunteer had temporary increase during the process of impact, and returned to normal level soon after the impact.


CONCLUSIONS
There is difference in a certain extend between the dynamic responses of human body and human surrogate. The ECG changes are induced mainly by mental stress during process of impact.
Institute of Space Medico-Engineering, Beijing, China. tancheng73623@sina.com
Cheng
C
Tan
Yao-yu
YY
Guo
Hong-hui
HH
Yang
Shi-zhong
SZ
Jiang
D000054:Acceleration; D000328:Adult; D001696:Biomechanical Phenomena; D004562:Electrocardiography; D005069:Evaluation Studies as Topic; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D018471:Hypergravity; D008348:Manikins; D016683:Supine Position / Q000502:physiology*