fredly wrote:
Quote:
Can you see how seat angle is not a proxy and pelvic rotation would not affect this measurement?
Your hypothesis isn't confined to positional changes that are bound or described by that measurement, so while yes, also no.
I think what you're suggesting is that saddle angle, pedal velocity, rider pad stack/y, and other possibly confounding factors should be included in any analysis.
They get tested as interaction terms. I’d hypothesize that those interaction terms will have no significant effect.
In everyday words: as you change distance x, the difference in % quad vs glute muscle engagement will be roughly the same despite the rider sitting more upright or more leaned over, at different saddle angles, and at different pedal velocities when cadence is maintained across different crank lengths.
It seems you are also making the point that the interaction terms need to also be included as independent variables re: your chicken/egg and proxy comments. I don’t expect a change in pad stack/y, saddle angle or pedal velocity will effect quad vs glute engagement even remotely as much as changes in the distance x.
note: If a rider is sliding forward on a saddle with a slick cover material, that can definitely overuse quads. The Wove V8 saddle has a grippy cover for that reason, to hold the rider in place.
Identifying and testing the effects of confounding factors is important, and also a given.
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Last edited by:
milesthedog: Oct 15, 23 6:07