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KMID : 1137820210420050225
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의공학회지
2021 Volume.42 No. 5 p.225 ~ p.231
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Effect of Back Strap Length Differences on Upper Extremity Muscle Activity, Center of Pressure, and Weight Distribution
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Lee Hyun-Ju
Kim Min-Su
Kim Ah-Yeon
Kang Hyun-Gu
Tae Ki-Sik
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Abstract
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The purpose of this study was to investigate the effect on the activity of the upper trapezius and erector spinae according to the length difference of the backpack using electromyogram (EMG). We also conducted a study comparing the center of pressure (COP) and weight distribution before and after using Wii® balance board. Thirty individuals were randomly assigned to the experimental group (n=14) wearing a backpack with a short right strap length and a control group (n=16) wearing a backpack with the same strap length. Data were collected by dividing into groups, carring a 15% weight backpack and walking for 20 minutes on a treadmill. As a result of analyzing the EMG data, there was no significant change in the upper extremity muscle activity of the control group, but it was significantly decreased in the right upper trapezius activity of the experimental group (p<0.05). In addition, there was a significant change of COP in the experimental group (p<0.05), but there was no significant difference of the weight distribution in both groups. Recognizing mechanical changes in the body that may occur due to the asymmetry of the strap length is thought to be helpful for systematic ergonomic intervention according to changes in the external environment in the future.
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KEYWORD
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Backpack, COP, EMG, Strap length difference, Weight distribution
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