“…For concentric needle electrode investigations, normative values have repeatedly been published in few muscles such as biceps brachii (BB), or lateral vastus (LV) muscles (Barkhaus, Periquet, & Nandedkar, 1997; Bischoff, Stålberg, Falck, & Eeg‐Olofsson, 1994; Doherty & Stashuk, 2003; Finsterer & Fuglsang‐Frederiksen, 2000; McGill & Dorfman, 1985; Mische, 2014; Nandedkar, Barkhaus, & Charles, 1995; Podnar, 2009). Few EMG data are available about motor unit potentials (MUPs) in the truncal muscles (Barkhaus et al., 1997; Mische, 2014; Tomasella, Crielaard, & Wang, 2002; Travlos, Trueman, & Eisen, 1995). In fact, only one study has previously been done with concentric needle electrodes in 11 healthy subjects (Barkhaus et al., 1997).…”