Backpackers light weight when walking

After inventing an energy-backed backpack that can power a machine, a US researcher is now finding ways to help those who wear heavy bags on their backs.

Biologist Larry Rome of the University of Pennsylvania and two associates introduced in the journal Nature a device that allows for 80% reduction in shoulder weights at every step.

The principle is to use the elastic cord to hang the backpack on the back, to reduce the vertical movement . Measurements of volunteers walking on a walker demonstrate that one can carry a 27kg bag hung so it consumes the equivalent of wearing a 21.7kg classic bag. Elastic straps mitigate movements and prevent the backpack from moving up and down at every step that causes wearer fatigue. These vertical movements are caused by the pendulum action to raise the hips 5 to 7 cm at each step.

Larry Rome (Photo: Techno-science.net)

For efficient operation, tensioning of the elastic belts should be adjusted by weight. 'When adding 3 or 4kg in a bag, just stretch the strings set by simple pegs,' explained the biologist.

This principle can be applied to pedestrians or soldiers who wear heavy backpacks, as well as for students who wear too much. Reducing the attachment of the carrier helps to reduce the problem of orthopedics.

Impact mitigation is more impressive when running. The pressure of a 20kg bag carrying on the shoulder equals a force of over 60kg at each step, quickly causing fatigue. With a hanging bag, the additional force is reduced by 86%, making the runner feel lighter. This may cause concern for emergency services as well as firefighters who need to intervene quickly.

The principle is to use the elastic cord to hang the backpack on the back, to reduce the vertical movement. (Photo: Techno-science.net)