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The Effect of Visual Biofeedback on EMG Activity of Trunk Muscles and Endurance Holding Time for Correct Position During Whole-Body Tilt Exercise  

Kang, Min-Hyeok (Dept. of Physical Therapy, The Graduate School, Inje University)
Yoon, Ji-Yeon (Motion Analysis Laboratory, Haeundae Paik Hospital, Inje University)
Yang, Jae-Lak (HANMED Co., Ltd.)
Jang, Jun-Hyeok (Dept. of Physical Therapy, Haeundae Jaseng Hospital of Oriental Medicine)
Jung, Doh-Heon (Dept. of Rehabilitation Therapy, The Graduate School, Yonsei University)
Oh, Jae-Seop (Dept. of Physical Therapy, College of Biomedical Science and Engineering, Inje University)
Publication Information
Physical Therapy Korea / v.18, no.1, 2011 , pp. 9-17 More about this Journal
The purpose of this study was to assess visual biofeedback's influence on trunk muscles' (EMG) activity and endurance holding time for correct position during whole-body tilt exercise. For the study, we recruited 14 volunteers who showed no symptom of lumbar disease during medical tests. We measured the EMG activity of their rectus abdominis, external abdominal oblique, internal abdominal oblique and erector spinae muscles, and their endurance holding time for correct position during $40^{\circ}$ anterior and posterior whole-body tilt under two conditions: whole-body tilt with and without visual biofeedback. Resistance with gravitational force on the trunk during whole-body tilt was applied by using a device that had a monitor on which the subjects could check their alignment and that sounded an alarm if a subject's alignment collapsed. The study showed an increase in the EMG activity of external abdominal oblique, internal abdominal oblique/rectus abdominis ratio and endurance holding time for correct position during both $40^{\circ}$ anterior and posterior whole-body tilt with visual biofeedback compared with without visual biofeedback (p<.05). We suggest that the whole-body tilt exercise with visual biofeedback could be a beneficial strategy for selectively strengthening the internal abdominal oblique muscle and minimizing the rectus abdominis muscle's activity while maintaining correct alignment during whole-body tilt exercise.
Electromyography; Endurance holding time; Trunk muscles; Visual biofeedback; Whole-body tilt;
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Times Cited By KSCI : 1  (Citation Analysis)
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