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Slowtwitch Forums: Triathlon Forum: Re: cadence [gciriani]: Edit Log



Frank Day

Oct 29, 09 8:00


Views: 3361
Re: cadence [gciriani]
In Reply To:
Quote:
Frank Day:
The data from unloaded pedaling, however, suggests the losses are too great to ever be ignored and, probably, not much can be done about it because a lot of the loss is probably coming from the hysterisis in the soft tissue of the leg, tissue that is constantly being accelerated, has a lot of mass and doesn't have a lot of springiness.


I think we are getting somewhere. By unloaded pedaling, you mean passive muscles in which shortening and lengthening muscle fibers cause the sliding myo-filaments to generate friction against each other. Am I interpreting you correctly?
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.
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Frank,
An original Ironman and the Inventor of PowerCranks


(This post was edited by Frank Day on Oct 29, 09 8:04)


Edit Log:
Post edited by Frank Day (Dawson Saddle) on Oct 29, 09 8:04