“…142 With increasing time of sustained isometric contraction, either maximal or submaximal, median and mean power of the power spectrum analysis decreases (Fig. 2), probably due to a decrease in conduction velocity along the fatigued muscle fibers and possibly due to synchronization, 2,3,10,13,16,21,28,30,42,118,122,133,134,137,151,155,156,158,171 although the latter statement is controversial. 42 The decrease in conduction velocity along the fatigued muscle fiber is not fully understood but may be due to low intracellular pH and increased extracellular potassium concentration.…”