For EMG recording, which bandwidth setting best preserves muscle activity frequencies?

For EMG recording, which bandwidth setting best preserves muscle activity frequencies?

• A. LFF = 10Hz HFF=100Hz
• B. LFF=0.3Hz, HFF=30Hz
• C. LFF=1Hz, HFF=30Hz
• D. LFF=0.1Hz, HFF=0.5Hz

Answer: (A)

Bandpass settings determine which frequency components of the EMG signal are kept. Muscle activity contains rapid fluctuations that sit from roughly the low tens of Hz up into several hundred Hz, so you want a passband wide enough to include those frequencies while still filtering out drift and noise. The setting with a low cutoff of 10 Hz and a high cutoff of 100 Hz offers the broadest practical EMG passband among the options, preserving most of the muscle activity energy from about 10 to 100 Hz. The other options restrict the upper end (30 Hz) or use an overly narrow window (very low upper limit or very low low-end), which would lose important high-frequency content of the EMG signal. Therefore, this bandwidth best preserves muscle activity frequencies.

Bandpass settings determine which frequency components of the EMG signal are kept. Muscle activity contains rapid fluctuations that sit from roughly the low tens of Hz up into several hundred Hz, so you want a passband wide enough to include those frequencies while still filtering out drift and noise. The setting with a low cutoff of 10 Hz and a high cutoff of 100 Hz offers the broadest practical EMG passband among the options, preserving most of the muscle activity energy from about 10 to 100 Hz. The other options restrict the upper end (30 Hz) or use an overly narrow window (very low upper limit or very low low-end), which would lose important high-frequency content of the EMG signal. Therefore, this bandwidth best preserves muscle activity frequencies.