Intermuscular Coherence is a measure to quantify correlations between the activity of two muscles, which is often assessed using electromyography.
The correlations in muscle activity are quantified in frequency domain,[1] and therefore referred to as intermuscular coherence.
The early studies that investigated the relationship of EMG activity used time-domain cross-correlation to quantify common input.
[3][4] The explicit notion of presence of synchrony between motor units of two different muscles was reported at a later time.
[5] In the 1990s, coherence analysis was introduced to examine in frequency content of common input.