Electromyographic analysis of transversus abdominis and lumbar multifidus using wire electrodes during lumbar stabilization exercises.
METHODS
Experimental laboratory study.


OBJECTIVE
To measure trunk muscle activity using wire electrodes during lumbar stabilization exercises and to examine if more effective exercises to activate the deep trunk muscles (local muscles) exist.


BACKGROUND
Lumbar stabilization exercises are performed to improve motor control of trunk muscles. However, the magnitude of activation of local muscles during lumbar stabilization exercises is not clear.


METHODS
Nine healthy men with no history of lumbar spine disorders participated in the study. Fine-wire electrodes were inserted into the transversus abdominis (TrA) and lumbar multifidus, bilaterally. In addition, surface electrodes were attached to the rectus abdominis, external obliques, and erector spinae, bilaterally. Electromyographic signal amplitude was measured during the following exercises: elbow-toe, hand-knee, back bridge, side bridge, and curl-up. Two-way analyses of variance were used to compare muscle activity level among exercises and between sides for each muscle.


RESULTS
The exercise showing the greatest activity level for the TrA was elbow-toe exercise with contralateral arm and leg lift. In addition, for the TrA, a significant side-to-side difference in activation level was demonstrated for 7 of the 11 exercises that were performed. The activity level of the multifidus was greatest during the back bridge exercises. The curl-up exercise generated the highest activity level for the rectus abdominis and the back bridge, with single-leg lift exercises generating the highest erector spinae activity.


CONCLUSIONS
The exercises investigated in this study resulted in a wide range of effort level for all 5 muscles monitored. Many of the exercises also resulted in an asymmetrical (right versus left side) activation level for a muscle, including the TrA.
Department of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Ibaraki, Japan.
Yu
Y
Okubo
Koji
K
Kaneoka
Atsushi
A
Imai
Itsuo
I
Shiina
Masaki
M
Tatsumura
Shigeki
S
Izumi
Shumpei
S
Miyakawa
D000009:Abdominal Muscles / Q000294:innervation* / Q000502:physiology*; D000704:Analysis of Variance; D004566:Electrodes; D004576:Electromyography; D015444:Exercise / Q000502:physiology*; D005081:Exercise Therapy / Q000379:methods*; D006801:Humans; D008161:Lumbosacral Region / Q000294:innervation* / Q000502:physiology*; D008297:Male; D009119:Muscle Contraction / Q000502:physiology; D055815:Young Adult