AI Article Synopsis
- The study investigated how adding lateral stiffness rods to a rucksack affects load distribution between the shoulders and hips.
- A mannequin with 3D load cells was used to measure the amount of load on the upper body versus the hip area while carrying a fixed weight of 25 kg.
- The findings indicated that the rods transferred 14% of the vertical load to the hips, helping to reduce stress on the upper body, while also increasing back support by 12% at the L3-L4 spinal level.
Article Abstract
The purpose of this study was to examine the change in load distribution characteristics associated with adding lateral stiffness elements (rods) to a rucksack (backpack). A load distribution mannequin was instrumented with two 3D load cells to allow determination of the load applied to the shoulders and upper torso independent of the load applied to the hips and lower trunk. Position and mass of the payload (25 kg) were fixed at the centre of the volume of the rucksack and held constant during all testing. It was hypothesized that lateral rods would provide a force bridge that transfers part of the vertical load of the pack from the upper back and shoulders to the hip belt thereby reducing the vertical load on the torso, and possibly reducing the horizontal reaction force that produces a shear load on the spine. Results showed that these active stiffness elements shifted 14% of the vertical load from the upper torso to the pelvic region with lumbar shear load remaining relatively unchanged for all combinations of shoulder strap and waist belt tension. The lateral rods also provided a mean increase of 12% in the extensor moment at the L3-L4 level, thus reducing some demand on the erector spinae muscles.
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| http://dx.doi.org/10.1080/00140130410001699137 | DOI Listing |
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