noisy ecg signal generated in matlab workspace to export to simulink

i have generated a signal in matlab workspace and want to add that signal to a low pass filter in simulink The low pass filter removes the corrupting high frequency noises in ECG. The cut off frequency used here is 100Hz while the sampling frequency is 1000Hz. Matlab is used for the design. and i have A raw noisy ECG signal containing corrupting high frequency, low frequency and 50 Hz powerline noises