I have no idea what you mean by ‘normalize’. When I looked it up, it seemed relatively noise-free, and the baseline was smooth and not offset. The sampling frequency is128 Hz, so the easiest way to resample it is to use the Signal Processing Toolboxresample function:
y = resample(x, 200, 128);
Theresample function incorporates filtering of the resampled signal, so I prefer it for signal processing.