Power Spectral Analysis of Acupoint Bioelectricity

Most of the researches on acupoint electric characteristics focus on acupoint impedence. However, acupoint bioelectricity measurements which have better reproducibility are more valuable. In this paper, we aimed to characterize the PSD (Power Spectral Density) of acupoint bioelectricity. Ten acupoints and control groups (four adjacent non-acupoints around each acupoint as a control group) were chosen in 30 trials on 10 volunteers aged 23-30 years. To denoise the bioelectricity signals, the db5 wavelet was used. We acquired the spectral characteristics of acupoint bioelectricity by PSE (Power Spectrum Estimation). The results show that acupoint bioelectricity signals have higher PSD and power (integral of entire bandwidth) than nearby non-acupoint area, and the most significant difference mainly distributes from 0 Hz to 10 Hz. The power of acupoint bioelectricity is about 21% higher than nearby non-acupoint bioelectricity, which shows the specificity of acupoint differ from non-acupoint. This research provides a quantitative analysis method to Traditional Chinese Medicine Science, which may be used to reveal the specificity of the acupoint.