一、简介

EMG，应用电子学仪器记录肌肉静止或收缩时的电活动，及应用电刺激检查神经、肌肉兴奋及传导功能的方法。英文简称EMG。通过此检查可以确定周围神经、神经元、神经肌肉接头及肌肉本身的功能状态。\ 通过测定运动单位电位的时限、波幅，安静情况下有无自发的电活动，以及肌肉大力收缩的波型及波幅，可区别神经原性损害和肌原性损害，诊断脊髓前角急、慢性损害(如脊髓前灰质炎、运动神经元疾病)，神经根及周围神经病变(例如肌电图检查可以协助确定神经损伤的部位、程度、范围和预后)。另外对神经嵌压性病变、神经炎、遗传代谢障碍神经病、各种肌肉病也有诊断价值。此外，肌电图还用于在各种疾病的治疗过程中追踪疾病的恢复过程及疗效。\ 利用计算机技术，可作肌电图的自动分析，如解析肌电图、单纤维肌电图以及巨肌电图等，提高诊断的阳性率。\ 肌电图检查多用针电极及应用电刺激技术，检查过程中有一定的痛苦及损伤 ，因此除非必要 ，不可滥用此项检查。另外，检查时要求肌肉能完全放松或作不同程度的用力，因而要求受检者充分合作。对于某些检查，检查前要停药，如新斯地明类药物应于检查前16小时停用\ 记录肌肉动作电位的曲线(电描记图)称为肌电图。缩写为EMG。实际使用的描记方法有两种：一种是表面导出法，即把电极贴附在皮肤上导出电位的方法；另一种是针电极法，即把针电极刺入肌肉导出局部电位的方法。用后一种方法能分别记录肌肉每次的动作电位，而根据从每秒数次到二、三十次的肌肉动作电位情况，发现频率的异常。应用肌电图还可以诊断运动机能失常的原因。平常所用的针电极称为同心电极，它是把细针状电极穿过注射针的中心，两者绝缘固定制成的。

二、源代码

``` %% Program Start %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%　名称：信号处理课程设计 %%　功能：脉搏检测系统GUI主界面 %%　 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%

function varargout = mainjiemian(varargin) % MAINJIEMIAN MATLAB code for mainjiemian.fig % MAINJIEMIAN, by itself, creates a new MAINJIEMIAN or raises the existing % singleton. % % H = MAINJIEMIAN returns the handle to a new MAINJIEMIAN or the handle to % the existing singleton. % % MAINJIEMIAN('CALLBACK',hObject,eventData,handles,...) calls the local % function named CALLBACK in MAINJIEMIAN.M with the given input arguments. % % MAINJIEMIAN('Property','Value',...) creates a new MAINJIEMIAN or raises the % existing singleton*. Starting from the left, property value pairs are % applied to the GUI before mainjiemianOpeningFcn gets called. An % unrecognized property name or invalid value makes property application % stop. All inputs are passed to mainjiemianOpeningFcn via varargin. % % *See GUI Options on GUIDE's Tools menu. Choose "GUI allows only one % instance to run (singleton)". % % See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help mainjiemian

% Last Modified by GUIDE v2.5 29-Apr-2021 12:18:07

% Begin initialization code - DO NOT EDIT guiSingleton = 1; guiState = struct('guiName', mfilename, ... 'guiSingleton', guiSingleton, ... 'guiOpeningFcn', @mainjiemianOpeningFcn, ... 'guiOutputFcn', @mainjiemianOutputFcn, ... 'guiLayoutFcn', [] , ... 'guiCallback', []); if nargin && ischar(varargin{1}) guiState.gui_Callback = str2func(varargin{1}); end

if nargout [varargout{1:nargout}] = guimainfcn(guiState, varargin{:}); else guimainfcn(guiState, varargin{:}); end % End initialization code - DO NOT EDIT

% --- Executes just before mainjiemian is made visible. function mainjiemian_OpeningFcn(hObject, eventdata, handles, varargin) % This function has no output args, see OutputFcn. % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % varargin command line arguments to mainjiemian (see VARARGIN)

% Choose default command line output for mainjiemian handles.output = hObject; ha=axes('units','normalized','position',[0 0 1 1]); uistack(ha,'down') II=imread('1.jpg'); image(II) colormap gray set(ha,'handlevisibility','off','visible','off'); % Update handles structure

% Update handles structure guidata(hObject, handles);

% UIWAIT makes mainjiemian wait for user response (see UIRESUME) % uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line. function varargout = mainjiemian_OutputFcn(hObject, eventdata, handles) % varargout cell array for returning output args (see VARARGOUT); % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure varargout{1} = handles.output;

% --- Executes on button press in togglebutton1. function togglebutton1_Callback(hObject, eventdata, handles) untitled; % hObject handle to togglebutton1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of togglebutton1

% --- Executes on button press in togglebutton2. function togglebutton2_Callback(hObject, eventdata, handles) yuchuli; % hObject handle to togglebutton2 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of togglebutton2

% --- Executes on button press in togglebutton3. function togglebutton3_Callback(hObject, eventdata, handles) tezheng; % hObject handle to togglebutton3 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Hint: get(hObject,'Value') returns toggle state of togglebutton3

% --- Executes when figure1 is resized. function figure1SizeChangedFcn(hObject, eventdata, handles) % hObject handle to figure1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) if nargout [varargout{1:nargout}] = guimainfcn(guiState, varargin{:}); else guimainfcn(gui_State, varargin{:}); end % End initialization code - DO NOT EDIT

% --- Executes just before jidian is made visible. function jidian_OpeningFcn(hObject, eventdata, handles, varargin) % This function has no output args, see OutputFcn. % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA) % varargin command line arguments to jidian (see VARARGIN)

% Choose default command line output for jidian handles.output = hObject; ha=axes('units','normalized','position',[0 0 1 1]); uistack(ha,'down') II=imread('666.jpg'); image(II) colormap gray set(ha,'handlevisibility','off','visible','off');

axes(handles.axes1); axes(handles.axes2); axes(handles.axes3); axes(handles.axes4); axes(handles.axes5); axes(handles.axes6); % Update handles structure guidata(hObject, handles);

% UIWAIT makes jidian wait for user response (see UIRESUME) % uiwait(handles.figure1);

% --- Outputs from this function are returned to the command line. function varargout = jidian_OutputFcn(hObject, eventdata, handles) % varargout cell array for returning output args (see VARARGOUT); % hObject handle to figure % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure varargout{1} = handles.output;

% --- Executes when figure1 is resized. function figure1_SizeChangedFcn(hObject, eventdata, handles) % hObject handle to figure1 (see GCBO) % eventdata reserved - to be defined in a future version of MATLAB % handles structure with handles and user data (see GUIDATA)

% --- Executes on button press in pushbutton1. function pushbutton1Callback(hObject, eventdata, handles) %%%%%把代码放到这，运行时自动加载 [filename,filepath]=uigetfile('C:\Users\dell\Desktop\信号处理课设-----杨硕\初始脉搏数据\MaiBobefore.txt'); filename=[filepath,filename]; [t,Plusepre]=textread(filename,'%f%f','headerlines',1);%读入2个浮点值，并跳过文档的第1行 [m,n]=size(Plusepre); n=3; s3=Plusepre;

%%%%%%%%%%%%—————提取2000个点进行数据处理——————%%%%%%%%%%%%%%%%%%%% fs=360;%采样率 x0=s3(1:2000);%取1到2000共2000个点 t=1:length(x0);%length(x0)指x0数组元素的个数 axes(handles.axes1); plot(t,x0) xlabel('采样点'); ylabel('magtitude'); title('标准脉搏信号') box1=msgbox('正在加载请稍候','提示'); %%%%%%%%%%%%%%%%%%%%%%%%%%%%初步去除基线漂移%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%% %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%中值滤波%%%%%%%%%%%%%%%%%%%%%%%%%%%% L1=medfilt1(x0,330); %一维中值滤波，x0为数组，即要处理原始波形，n是中值滤波器的参数，L1是滤波以后的结果(数组) L2=x0-L1; %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%频谱%%%%%%%%%%%%%%%%%%%%%%%% N=length(x0);%样点个数 df=fs/(N-1);%分辨率 f=(0:N-1)df;%其中每点的频率 Y=fft(L2(1:N))/N2;%真实的幅值 axes(handles.axes2); plot(f(1:N/2),abs(Y(1:N/2)));%傅里叶变换后的频谱图是对称的，这里需要一半就可以了 xlabel('频率/Hz'); ylabel('振幅'); axis ( [0 100 0 0.4] ); title('中值滤波后脉搏信号频率谱') drawnow; ```

三、运行结果

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四、备注

版本：2014a