The potential of corticomuscular and intermuscular coherence for research on human motor control

In an experimental study on the changes in descending drive during muscle fatigue, Semmler et al. (2013) investigated inter-muscular (EMG–EMG) coherence in elbow muscles after eccentric exercise. They reported a broadband increase in coherence with fatigue in all elbow flexor muscle pairs and suggested that these changes reflect increased common oscillatory input to the elbow flexors. This interpretation was questioned in the Editorial by Heroux and Gandevia (2013), who noted that the mechanisms gener-ating the reported increase in coherence are unclear and that peripheral factors