| Effects of Backpack Load on Spatiotemporal Parameters, Trunk and Shoulder Muscles Activity and Fatigue |
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Suh-Jung Kang |
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Sangmyung University |
Correspondence:
Suh-Jung Kang,
Email: suhjkang@smu.ac.kr
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Received: 26 November 2012 • Accepted: 19 January 2013 |
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| Abstract |
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. |
| Keywords:
Backpack load, Spatiotemporal parameter, Trunk muscle, Shoulder muscle, EMG |
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