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Motor unit recordings. a Schematic showing surface and indwelling needle electrodes at the muscle motor point. A typical concentric needle electrode may capture MUPs from up to around 2000 muscle fibres. b Raw data recorded from the vastus lateralis of a healthy older man showing force, intramuscular and surface EMG traces. c A single motor unit potential showing amplitude, duration and complexity in terms of phases (P) and turns (T)
