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KMID : 1023920130150010069
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Journal of the Korean Academy of Kinesiology
2013 Volume.15 No. 1 p.69 ~ p.77
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Effects of Backpack Load on Spatiotemporal Parameters, Trunk and Shoulder Muscles Activity and Fatigue
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Kang Suh-Jung
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Abstract
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Introduction: The purpose of the study was to investigate how different load weights(0, 10, 20, & 30% BodyWeight(BW)) affect spatiotemporal parameters in gait, trunk and shoulder muscles activity and fatigue.
Method: Ten healthy male subjects(Age: 26.9±2.2yrs, Height: 179±5.73cm, Weight: 76.2±5.8kg) were participated in the study. In order to get the spatiotemporal parameters, cameras, markers and Visual 3D program were used. The activity and fatigue in four muscles(Upper Trapezius, Lower Trapezius, Rectus Abdominis, & Erector Spinae) were analyzed with using Wireless EMG System. One-way repeated measures ANOVA and LSD(Post-Hoc) were used to analyze the effects of different load weights on spatiotemporal parameters, trunk and shoulder muscles activity and fatigue.
Result: Spatiotemporal parameters(velocity, step length, & stride length) did not show any significant difference. Lower Trapezius muscle showed significant differences on different load weights. The fatigues in Rectus Abdominis and Erector Spinae showed significant differences at over 20%BW load weights.
Conclusion: The backpack load in over 20%BW caused more fatigues of trunk muscles than shoulder muscles. Therefore, it might be considered in backpack design.
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KEYWORD
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Backpack load, Spatiotemporal parameter, Trunk muscle, Shoulder muscle, EMG
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