Demo File: ECG 60 Hz Noise.zip
This short file contains an ECG channel affected by 60Hz noise, which is typically caused by electrical interference. 60Hz power is common in the United States and a few other countries. In much of the rest of the world, electrical interference is characterized by 50 Hz noise. Both frequencies are filtered in the same manner.
Use the 60Hz Notch filter in BioLab or analysis to minimize/remove the interference:
Once the notch filter is applied, the noise should be significantly reduced.
See this blog post for techniques used to avoid this sort of noise during data acquisition, as well as other types of noise seen in ECG data.