Oct 29, 09 8:00
An original Ironman and the Inventor of PowerCranks
(This post was edited by Frank Day on Oct 29, 09 8:04)
Unloaded pedaling is simply pedaling that is doing no external work so no net force/work done by the pedals. This means the muscle are not passive but contracting but only to the degree necessary to replace that losses from the motion. Internal friction in the joints and muscles would be one source of loss but this cannot explain all the loss because the shape of the loss curves are curvilinear and a friction only based loss would be expected to follow a straight line. Therefore, material deformation losses must be present also and these woudld be expected to vary with the square of the cadence, causing the losses to follow a curvilinear path.