Monopolar needle, isometric contraction. McGill KC, VA RR&D Ctr, Palo Alto, US.

Single-channel EMG signals from low and moderate isometric contractions of the brachial biceps muscle of a normal subject. R00108 is from a low-level contraction and contains 8 MUAP trains. It is the demo signal included with the EMGlab software. R00112 is from a stronger contraction and contains 16+ MUAP trains.