Electromyography ( EMG ) is an electrodiagnostic medicine technique for evaluating and recording the electrical activity produced by skeletal muscles . EMG is performed using an instrument called an electromyograph to produce a record called an electromyogram . An electromyograph detects the electric potential generated by muscle cells when these cells are electrically or neurologically activated . The signals can be analyzed to detect medical abnormalities , activation level , or recruitment order , or to analyze the biomechanics of human or animal movement .

Question: what features of muscle contraction can be determined from an emg (electromyogram)
Answer: electric potential generated