MATLAB Answers

Processing EMG data in MATLAB?

467 ビュー (過去 30 日間)
Tom Nickolay
Tom Nickolay 2020 年 2 月 25 日
コメント済み: Meghna Kalra 2021 年 5 月 29 日
Hi all,
I am VERY new to MATLAB, so please excuse my ignorance if this is a very novice problem. I am analysing EMG signals, I have imported from my data from xlsx as time (X) and voltage (y).
After extracting data;
set(0, 'defaultFigureToolbar', 'none')
% RAW_DATA_EXTRACTION
%% BACK_SQUAT
%%% VISIT_ONE
T1_10rm_BS_1 = xlsread('T1_70%_10rm_BS_1.xlsx','Sheet3','A5:E77494');
time = T1_10rm_BS_1(:,1);
BS_RF_1 = T1_10rm_BS_1(:,4);
BS_BF_1 = T1_10rm_BS_1(:,5);
T1_10rm_BS_2 = xlsread('T1_70%_10rm_BS_2.xlsx', 'Sheet4','A5:E78394');
time = T1_10rm_BS_2(:,1);
BS_RF_2 = T1_10rm_BS_2(:,4);
BS_BF_2 = T1_10rm_BS_2(:,5);
running filters;
%FILTER
% Lowpass filter 500Hz
Freq = 1500;
NyqFreq = Freq/2;
Lowpass = 500;
Wn = Lowpass/NyqFreq;
[B,A] = butter (4,Wn,'low');
% run filter
BS_RF_1_low_filtered = filtfilt(B,A,BS_RF_1);
BS_BF_1_low_filtered = filtfilt(B,A,BS_BF_1);
BS_RF_2_low_filtered = filtfilt(B,A,BS_RF_2);
BS_BF_2_low_filtered = filtfilt(B,A,BS_BF_2);
% Highpass filter 10Hz
Highpass = 10;
Wo = Highpass/NyqFreq;
[D,C] = butter (4,Wo,'high');
% run filter
high_pass_BS_RF_1_filtdata = filtfilt(D,C,BS_RF_1_low_filtered);
high_pass_BS_BF_1_filtdata = filtfilt(D,C,BS_BF_1_low_filtered);
high_pass_BS_RF_2_filtdata = filtfilt(D,C,BS_RF_2_low_filtered);
high_pass_BS_BF_2_filtdata = filtfilt(D,C,BS_BF_2_low_filtered);
% Full wave rectification of EMG
filtered_BS_RF_1 = abs(high_pass_BS_RF_1_filtdata);
filtered_BS_BF_1 = abs(high_pass_BS_BF_1_filtdata);
filtered_BS_RF_2 = abs(high_pass_BS_RF_2_filtdata);
filtered_BS_BF_2 = abs(high_pass_BS_BF_2_filtdata);
% Linear envelope (2Hz lowpass)
LP = 2;
Wp = LP/NyqFreq;
[F,E] = butter (4,Wp,'low');
linear_BS_RF_1 = filtfilt(F,E,filtered_BS_RF_1);
linear_BS_BF_1 = filtfilt(F,E,filtered_BS_BF_1);
linear_BS_RF_2 = filtfilt(F,E,filtered_BS_RF_2);
linear_BS_BF_2 = filtfilt(F,E,filtered_BS_BF_2);
and generating my plot (for BS_RF_1);
I am now struggling to try and find the area under the curve for my set of 10 repetitions.
I am looking to define mean activation and peak activation.
All constructive help welcome,
Cheers.
  1 件のコメント
Meghna Kalra
Meghna Kalra 2021 年 5 月 29 日
Hello Tom, can you please tell where you got this EMG signal data from?

サインインしてコメントする。

採用された回答

Aquatris
Aquatris 2020 年 2 月 25 日
編集済み: Aquatris 2020 年 2 月 25 日
I think you are looking for the function cumtrapz, here is the link.

その他の回答 (0 件)

製品


リリース

R2019b

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by