Table 2.

Investigated muscles and respective electrode locations according to Hermens (47)

Muscle	Electrode location/orientation
M. longissimus thoracis (lo)	At L1 level over the palpable bulge of the muscle/vertical
M. multifidus (mf)	At L5 level, medial the line between L1 and PSIS/along line
M. gluteus medius (gd)	50% on the line from iliac crest to the great trochanter/vertical
M. gluteus maximus (gx)	At greatest prominence of muscle/45° to outside
M. biceps femoris (bf)	50% on the line between ischial tuberosity and lateral epicondyle of the tibia/along line
M. semitendinosus (st)	50% on the line between ischial tuberosity and medial epicondyle of the tibia/along line
M. tensor fasciae latae (tf)	On the line from the ASIS to the lateral femoral condyle in the proximal 1/6/along line
M. rectus femoris (rf)	50% on the line between ASIS and upper end of patella/along line
M. vastus lateralis (vl)	At 2/3 on the line from the ASIS to the lateral side of the patella/along line
M. vastus medialis (vm)	At 8/10 on the line from the ASIS to the medial knee joint space/perpendicular to line
M. gastrocnemius (medialis, gc)	At most prominent bulge of muscle/20° to the inside
M. soleus (so)	At 2/3 of the line between the medial femoral condyle to the medial malleolus (distal the lower end of the medial gastrocnemius)/vertical
M. tibialis anterior (ta)	At 1/3 on the line between the tip of the fibula and the tip of the medial malleolus/along line

PSIS, posterior superior iliac spine; ASIS, anterior superior iliac spine.