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. 2012 Aug;7(4):372–380.

Table 2.

Between-exercise difference in nEMG (% of MVIC) of 13 selected muscles. Values are presented as mean ± SE and significant between-exercise differences are marked with *

Crunch (elastic) Crunch (machine)
Rectus Abdominis 104(3.8)* 84 (3.8)
External Obi. (left) 86 (3.7) 79 (3.8)
External Obi. (right) 79 (3.8) 71 (3.8)
Erector spin, (left) 12(4.8) 20 (4.8)
Erector spin, (right) 11 (4.5) 14 (4.7)
 Gluteus Med 19(3.7) 15(3.8)
 Gluteus Max 10(3.8) 5 (3.8)
Rectus Femoris 27 (3.7) 65 (3.8) *
Vastus Medialis 22 (3.7) 25 (3.8)
Vastus Lateralis 16(3.7) 23 (3.8)
Biceps Femoris 10(3.7) 5 (3.8)
Semitendinosus 11(3.7) 4 (3.8)
 Adductor 19(3.8) 14(3.8)