Mechanical impedance of supine humans under sustained acceleration.

作者：L. Vogt, H E Krause, H. Hohlweck, E May · 发表于：PubMed · 年份：1973 · 被引用次数：14 · 研究领域：Non-Invasive Vital Sign Monitoring

Measurements of the mechanical impedance of the supine human body were conducted to investigate the nonlinearities of the body system. A hydraulically driven shake table was installed on a centrifuge. Transmitted force and the acceleration of the platform, on which the subjects were lying, were recorded in the frequency range of 2Hz-20Hz. Sinusodial acceleration amplitude was held constant at 0.5g. The impedance and phase results show that sustained acceleration up to +5Gx stiffens the human body with increasing Gx and shifts the resonance frequency from6Hz under normal gravity to 8Hz under +2Gx and further up to 11Hz, 13Hz and 15 Hz under +3Gx, +4Gx and +5Gx respectively. The modulus of impedance grows with centrifuge acceleration. These results show that the human body behaves nonlinearly in an extreme dynamic environment.