Jessica C. Selinger, Shawn M. O’Connor, Jeremy D. Wong, J. Maxwell Donelan, ‘Humans Can Continuously Optimize Energetic Cost during Walking’, http://www.cell.com/current-biology/abstract/S0960-9822%2815%2900958-6?_returnURL=http%3A%2F%2Flinkinghub.elsevier.com%2Fretrieve%2Fpii%2FS0960982215009586%3Fshowall%3Dtrue, http://dx.doi.org/10.1016/j.cub.2015.08.016, Current Biology, Elsevier (September 10, 2015).

Cost

Energetic cost is not just an outcome of movement, but also continuously shapes it.