Analysis of the Energetic Feature of the Loaded Gait with Variation of the Trunk Flexion Angle
The purpose of the research is to investigate the energetic feature of the backpack load on soldier’s gait with variation of the trunk flexion angle. It is believed that the trunk flexion variation of the loaded gait may cause a significant difference in the energy cost which is often in practice in daily life. To this end, seven healthy Korea military personnel participated in the experiment and are tested under three different walking postures comprised of the small, natural and large trunk flexion. There are around 5 degree differences of waist angle between each trunk flexion. The ground reaction forces were collected from the force plates and motion kinematic data are measured by the motion capture system. Based on these data, the impulses, momentums and mechanical works done on the center of body mass (COM) during the double support phase were computed. The result shows that the push-off and heel strike impulse are not relevant to the trunk flexion change, however the mechanical work by the push-off and heel strike were changed by the trunk flexion variation. It is because the vertical velocity of the COM during the double support phase is increased significantly with an increase in the trunk flexion. Therefore, we can know that the gait efficiency of the loaded gait depends on the trunk flexion angle. Also, even though the gravitational impulse and pre-collision momentum are changed by the trunk flexion variation, the after-collision momentum is almost constant regardless of the trunk flexion variation.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1089046Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 1498
 Jeffrey M. Schiffman, Carolyn K. Bensel, Leif Hasselquist, Karen Norton, and Louis Piscitelle, "The Effects of Soldiers’ Loads on Postural Sway” U.S. Army Natick Soldier Center, Natick, MA, 01760, USA.
 Stewart A Birrell, Robin H Hooper and Roger A Haslam, "The Effect of Military Load Carriage on Ground Reaction Forces” Department of Human Sciences, Loughborough University, Leicestershire, UK.
 Albert A. Adams III, "Effects Of Extremity Armor On Metabolic Cost And Gait Biomechanics”, M.S. Thesis, Worcester Polytechnic Institute, Worcester, MA 01609, USA.
 Joseph Knapik, and Katy Reynolds, "Load Carriage in Military Operations: A review of historical, physiological biomechanical, and medical aspects”, Borden Institute, Washington, DC., USA.
 Marcelo Castro, Sofia Abreu, Helena Sousa, Cristina Figueiredo, Leandro Machado, Rubim Santos and João Paulo Vilas-Boas, "The Influence Of Different Speeds On Backpacker´S Gait Kinetics”, Portuguese Journal of Sport Sciences 11 (Suppl. 2), pp. 459-462, 2011.
 A. D. Kuo, "Energetics of actively powered locomotion using the simplest walking model," Journal of Biomechanical Engineering, vol. 124, pp. 113, 2002. .