Abstract：Objective To study the changes of blood flow signals and spectral characteristics of the electrical impedance of human
lower limbs before and after high-intensity exercise, and to lay the foundation for evaluating the motor function and fatigue degree of
human body using electrical impedance parameters. Methods Using the electrical impedance rapid measurement system developed
by the research group, the impedance blood flow signals of the lower limbs of 10 volunteers before and after high-intensity exercise
and the amplitude of the electrical impedance of 1 kHz to 1 MHz band were measured. Results The impedance blood flow signal
characteristics showed that the amplitude of the impedance blood flow signal of the lower limbs of the human body increased by
22%±13% after exercise. The analysis of the impedance spectrum showed that the influence of motion on impedance amplitude
of lower limb was not significant in frequency band below 100 kHz. In the above frequency band above 100 kHz, the amplitude of
electrical impedance of lower limbs after exercise decreased significantly after exercise. The higher the measurement frequency, the
more obvious the degree of decline. The rate of change at 1 MHz could reach 53%±14%. Conclusion The electrical impedance of
human body has a close relationship with the state of motor function. Therefore, the electrical impedance parameter is expected to be
an important indicator for qualitatively and quantitatively distinguishing tissue fatigue state.
冯跃飞a
，张程龙b
，杨佳轩b
，季振宇a
，史学涛a. 高强度运动前后的人体下肢电阻抗特性变化分析[J]. 中国医疗设备, 2020, 35(5): 48-51.
FENG Yuefeia
, ZHANG Chenglongb
, YANG Jiaxuanb
, JI Zhenyua
, SHI Xuetaoa. Analysis of Changes in Electrical Impedance Characteristics of Human Lower Limbs
Before and After High-Intensity Exercise. China Medical Devices, 2020, 35(5): 48-51.
