Energy cost of load carriage

The relative contributions of rate of progression (1.5–4.0 mph), grade (3–9%), and load (10–30 kg) to total energy cost were determined. The data obtained were integrated graphically with some of the available energy cost data in the literature to provide a useful graph for estimating energy expenditure. It was tentatively concluded that for grade walking over the ranges studied, the energy cost per unit weight is essentially the same whether the weight is of the body or the load.