Development of a Dynamic Biomechanical Model for Load Carriage: Phase V: Development of the Biomechanical Model by Means of the Portable Measurement System


  1. Morin, E.L.
  2. Stevenson, J.M.
  3. Reid, S.A.
  4. Bryant, J.T.
Corporate Authors
Defence R&D Canada - Toronto, Toronto ONT (CAN);Queen's Univ, Kingston ONT (CAN) Ergonomics Research Group
Soldier operational performance is impacted by a number of factors including physiological workload, the biomechanical effects of equipment used in the field, demographics and soldier readiness. The specific objectives of the work reported here are to identify components of a load carriage limit (LCL) equation specifically related to the physiological workload and biomechanical effects, and to further the development of a dynamic biomechanical model (DBM) for load carriage. The ultimate goal of this research program is to develop and fully validate an LCL equation, which includes all relevant factors and which can be used to predict the operational effectiveness of soldiers in the field. Data were collected in a previous contract (W7711-03-7632-08) on 10 physically fit male subjects. A maximal oxygen consumption test was performed. This was followed by four experimental sessions during which oxygen consumption, accelerations at the sternum and on the framesheet of a loaded backpack, and contact pressures under the backpack were measured during a treadmill test for the conditions of: different backpack loads (0kg, 15 kg, 25 kg, 38 kg); different walking speeds (3.22, 4.83 and 6.44 km/h); and different inclines (0º, 5º, 10º). For the zero load condition, the second accelerometer was mounted on the lumbar spine of the subject, in order to compare the sternum and lumbar locations for predicting energy consumption. It was found that metabolic energy cost increased with increasi

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Load carriage;Dynamic Biomechanical Model;Portable measurement system;load carriage limit;LCL;metabolic energy;pack-person interface;contact pressure
Report Number
DRDC-TORONTO-CR-2005-128 — Contractor Report
Date of publication
01 May 2005
Number of Pages
Electronic Document(PDF)

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