hello
you can use smoothdata to smooth / average your curve then you do the interpolation to resample at dt = 1 second
nota that your original sample rate (0.8985 second) and the target one (1 second) are very close, so there are not many samples of data in a 1 second long buffer. I supposed that it was rather a matter of smoothing (but maybe I'm wrong)
t = TimeHR.Time;
y = TimeHR.HR;
dt = mean(diff(t)); % original rate
% smoothing using 'samples' length window
samples = 5;
ys = smoothdata(y,'gaussian',samples);
% interpolate to get 1 s time increment data
new_t = t(1):1:t(end);
new_ys = interp1(t,ys,new_t,'linear');
figure
plot(t,y,new_t,new_ys)
