Analysis of Changes in the Muscle Activity and Fatigue of the Erector Spinae using IT Convergent Type Medical Equipment
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The purpose of this study was to observe how changes in the upper body angle in a sitting posture on a chair affect the muscle activity and fatigue of the erector spinae to provide basic data on a correct sitting posture. This study involved 24 healthy males and females in their 20s. The average body angle of the subjects in each posture was 94 degrees in posture 1, 79 degrees in posture 2, and 109 degrees in posture 3. To examine the signal amount of the erector spinae, the erector spinae in the left and right cervical spine, thoracic spine, and lumber spine was selected, and each muscle's maximal voluntary isometric contraction (MVIC) was measured before the experiment. In the experiment using IT convergent type medical equipment, the three angles measured with a motion analyzer in a sitting posture on a chair were directed, and the electromyography signals for each posture were measured and recorded. Each electromyography signal was compared and analyzed, thereby extracting information on the characteristics of the electromyography signals according to each posture. The muscle activity of the longissimus thoracis increased in postures 1 and 2 compared with that in posture 3, and the muscle activity of the longissimus lumborum increased in posture 3 compared with that in postures 1 and 2(p<0.05). The muscle fatigue of the left longissimus thoracis (LLT) in posture 1 and the right longissimus thoracis (RLT) in posture 3 was significantly high(p<0.05). Therefore, as shown in the present experiment, to take a sitting posture while maintaining the upper body angle like in the posture 1 and the posture 2 is considered to be helpful for preventing low back pain or other spinal column diseases.
Abstract
The purpose of this study was to observe how changes in the upper body angle in a sitting posture on a chair affect the muscle activity and fatigue of the erector spinae to provide basic data on a correct sitting posture. This study involved 24 healthy males and females in their 20s. The average body angle of the subjects in each posture was 94 degrees in posture 1, 79 degrees in posture 2, and 109 degrees in posture 3. To examine the signal amount of the erector spinae, the erector spinae in the left and right cervical spine, thoracic spine, and lumber spine was selected, and each muscle's maximal voluntary isometric contraction (MVIC) was measured before the experiment. In the experiment using IT convergent type medical equipment, the three angles measured with a motion analyzer in a sitting posture on a chair were directed, and the electromyography signals for each posture were measured and recorded. Each electromyography signal was compared and analyzed, thereby extracting information on the characteristics of the electromyography signals according to each posture. The muscle activity of the longissimus thoracis increased in postures 1 and 2 compared with that in posture 3, and the muscle activity of the longissimus lumborum increased in posture 3 compared with that in postures 1 and 2(p<0.05). The muscle fatigue of the left longissimus thoracis (LLT) in posture 1 and the right longissimus thoracis (RLT) in posture 3 was significantly high(p<0.05). Therefore, as shown in the present experiment, to take a sitting posture while maintaining the upper body angle like in the posture 1 and the posture 2 is considered to be helpful for preventing low back pain or other spinal column diseases.
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