How can I find the heart rate and R-R time interval for ECG Signal?

I extracted this ECG Signal as xls file and i need to find heart rate and R-R Time interval. Help me out!

[MICHELE CASTRIOTTA]

I have a similar task. I need to calculate R-R from ECG signals. How can I do this?

Answer 1

[Star Strider]

Getting the information from the file was something of an adventure! I likely could have done this with detectImportOptions, however this was easier for me.

T1 = readtable('https://www.mathworks.com/matlabcentral/answers/uploaded_files/617833/samples%20(4).xls', 'VariableNamingRule','preserve')

T1 = 3600×3 table
    'Elapsed time'    'MLII'     'V5' 
    ______________    ______    ______

    {''0:00.000''}    -0.145    -0.065
    {''0:00.003''}    -0.145    -0.065
    {''0:00.006''}    -0.145    -0.065
    {''0:00.008''}    -0.145    -0.065
    {''0:00.011''}    -0.145    -0.065
    {''0:00.014''}    -0.145    -0.065
    {''0:00.017''}    -0.145    -0.065
    {''0:00.019''}    -0.145    -0.065
    {''0:00.022''}     -0.12     -0.08
    {''0:00.025''}    -0.135     -0.08
    {''0:00.028''}    -0.145    -0.085
    {''0:00.031''}     -0.15    -0.085
    {''0:00.033''}     -0.16    -0.075
    {''0:00.036''}    -0.155     -0.07
    {''0:00.039''}     -0.16     -0.07
    {''0:00.042''}    -0.175    -0.065

VN = T1.Properties.VariableNames

VN = 1×3 cell array
    {''Elapsed time''}    {''MLII''}    {''V5''}

Time = datetime(T1.('''Elapsed time'''),'InputFormat','''''mm:ss.SSS''''', 'Format','mm:ss.SSS')

Time = 3600×1 datetime array
   00:00.000
   00:00.003
   00:00.006
   00:00.008
   00:00.011
   00:00.014
   00:00.017
   00:00.019
   00:00.022
   00:00.025
   00:00.028
   00:00.031
   00:00.033
   00:00.036
   00:00.039
   00:00.042
   00:00.044
   00:00.047
   00:00.050
   00:00.053
   00:00.056
   00:00.058
   00:00.061
   00:00.064
   00:00.067
   00:00.069
   00:00.072
   00:00.075
   00:00.078
   00:00.081

RR1 = islocalmax(T1.('''MLII'''), 'MinProminence',1);

figure
plot(Time, T1.('''MLII'''))
hold on
plot(Time(RR1), T1{RR1,2}, '^r')
hold off
grid

RR2 = islocalmax(T1.('''V5'''), 'MinProminence',0.5);

figure
plot(Time, T1.('''V5'''))
hold on
plot(Time(RR2), T1{RR2,3}, '^r')
hold off

This will give you the indices of the R-deflections with respect to time. I am certain that you can take it frrom here, however it will first be necessary for you to understand what islocalmax does and what it returns.

[Sagarika R]

Thanks a lot!

[Star Strider]

As always, my pleasure!

Answer 2

[Nuwan]

How to find the R-R interval ?

[Nuwan]

This link

[Nuwan]

ok

[Star Strider]

Post this ss a new question. I will not respond to it here.