Korean J Sports Med.  2014 Jun;32(1):44-54. 10.5763/kjsm.2014.32.1.44.

The Effect of Visual Information Provision on the Changes of Electromyogram Activity in Trunk and Lower Leg Muscles during Dynamic Balance Control

Affiliations
  • 1Research Center for Exercise Sciences, Daegu University, Gyeongsan, Korea. jlee@daegu.ac.kr
  • 2Department of Physical Therapy, Eulji University, Daejeon, Korea.

Abstract

The purpose of this study was to investigate the changes of electromyogram activity of trunk and lower leg muscles during dynamic balance control in 20 healthy adult subjects when various experimental visual conditions were applied. Surface electromyography system was used for recording of any signals produced by muscles. Muscle activity was recorded from muscles, of which left and right sides of rectus abdominis, external obliques, longissimus thoracis, multifidus, vastus medialis, biceps femoris, gastrocnemius medialis, and tibialis anterior, and then normalized as percentage of maximum voluntary isometric contraction. All data obtained from experiment were analyzed using SPSS ver. 20.0, and two-way analysis of variance were used to determine statistical significance between two factors (3x2 factorial analysis, visual conditions vs. leg conditions). Statistical significance levels were set at alpha=0.05. There were significant different in biceps femoris and external obliques muscle's activities between right and left leg, showing more prominent reduction in left leg when blind vision condition was given. Significantly higher muscle activities were shown in both sides of multifidus (p<0.05), vastus medialis (p<0.001), tibialis anterior (p<0.001) and gastrocnemius medialis (p<0.001) with sighted vision and blanking vision compared to the condition of blind vision. These results confirmed that muscle activity is prominently stimulated by visual information provision, and this implies that visual input may be a major factor for maintaining of the body's balance control.

Keyword

Dynamic balance; Surface electromyogram; Trunk muscle; Lower leg muscle

MeSH Terms

Adult
Electromyography
Humans
Isometric Contraction
Leg*
Muscles*
Paraspinal Muscles
Quadriceps Muscle
Rectus Abdominis

Figure

  • Fig. 1. Location of attached surface electromyogram (EMG) electrodes. (A) Rectus abdominis, External obliques. (B) Longissimus thoracis, Multifidus. (C) Vastus medialis. (D) Biceps femoris. (E) Tibialis anterior. (F) Gastrocnemius medialis.

  • Fig. 2. Measurement of dynamic balance using SpaceBalance three-dimensional posturography. Picture is shown the experimental condition with sighted vision used.

  • Fig. 3. Measurement of maximum voluntary isometric contraction.


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Jinryeong Kim, Sunghoon Hur, Kyungjun An, Songjune Kim, Jongsam Lee
Korean J Sports Med. 2018;36(4):197-206.    doi: 10.5763/kjsm.2018.36.4.197.

The Changes of Contraction Patterns in Trunk Muscles with Multidirectional Tilting Motion on the Dynamic Posturography
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Korean J Sports Med. 2019;37(3):84-93.    doi: 10.5763/kjsm.2019.37.3.84.


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