基于小波变换的中医推拿法作用力信号能量分析

Energy analysis of rolling manipulation force signal based on wavelet transform

目的分析中医推拿法作用力各频率段的能量分布,揭示法的动力学特点。方法测量6位推拿专家及6位初学者的法推拿作用力信号,利用小波变换进行频带划分,计算各频率段的能量并进行统计分析。对垂直作用力和水平作用力构造18个特征量,提出了总体评价系数R。结果专家的法推拿作用力信号在0～0.406 25 Hz的低频段集中了近70%的能量,另有约20%的能量集中在1.625～3.25 Hz频率段。6位推拿专家总体评价系数R均大于0.70,6位初学者的总体评价系数R均小于0.70,两者具有较显著的差异。结论 法作用力各频率段的能量分布体现了法"柔和"性及周期性特点。当测试者法推拿技术动作规范且总体评价系数R大于0.70时,可认为已较好地掌握了法推拿技术。

Objective To analyze the energy of rolling manipulation in different frequency bands and find the fea-tures of rolling manipulation dynamics.Method The force signals of rolling manipulation of six experts and six beginners were measured and divided into different frequency bands by wavelet transform to calculate the energy.Through statistical analysis,18 characteristic quantities of horizontal force or vertical force were created and the overall evaluation coefficient R was proposed.Results About 70% of experts’rolling manipulation energy was found in 0 ～0.406 25 Hz and about 20% energy in 1.625 ～3.25 Hz.The overall evaluation coefficient-R of 6 ex-perts was over 0.70,while R of beginners was below 0.70,which showed the difference was significant.Conclu-sions The energy distribution of rolling manipulation reflects the characteristics of softness and periodicity.If the rolling manipulation is in accordance with the manipulative requirement and the overall evaluation coefficients R is over 0.70,it could be said that the operator masters the rolling manipulation well.