Test-retest reliability of wavelet - and Fourier based EMG (instantaneous) median frequencies in the evaluation of back and hip muscle fatigue during isometric back extensions. - Coorevits P; Danneels L; Cambier D; Ramon H; Druyts H; Karlsson JS; De Moor G; Vanderstraeten G (Journal of Electromyography & Kinesiology, 2008)