Core Muscle Activity, Exercise Preference, and Perceived Exertion during Core Exercise with Elastic Resistance versus Machine

Table 2

Normalized EMG (nEMG) values of the 5 selected muscles during torso-twist in machine and using elastic resistance, respectively. Values are presented as least square means (LSM) and 95% confidence interval (95% CI).

Muscle	Elastic	Machine	Mean diff. (95% CI)	value
	Mean (95% CI)	Mean (95% CI)
Rectus abdominis	10 (−3 to 24)	16 (3 to 29)	−5.6 (−20 to 9)	0.45
External obliques (left)	54 (40 to 67)	77 (64 to 90)	−23 (−38 to −9)	0.0018
External obliques (right)	47 (34 to 60)	41 (28 to 54)	6.2 (−8 to 20)	0.39
Erector spinae (left)	24 (10 to 37)	18 (4 to 32)	5.9 (−10 to 22)	0.47
Erector spinae (right)	50 (36 to 64)	32 (18 to 46)	17.7 (1.6 to 34)	0.03