rrheisler wrote:
No, actually, it doesn't. The shoe itself might have an actual ground contact point difference of somewhere between 3-5 mm, even when you have a 10-12 mm "drop" in midsole stack heights. This also fails to account for the difference in lasting techniques, whereby shoes with higher "drops" may in fact have lower angles of attack in them due to the way the foot actually sits inside the shoe. Think - sitting on top of the midsole versus sitting in it....
Which if any of these is heel-toe "drop"?
- A measure of the difference in thicknesses of the sole beneath the heel versus the toe
- A measure of the difference in distance from bottom of the heel to the ground versus the toes to the ground
- A measure of some arbitrary component of the shoe
- Something else
rrheisler wrote:
Furthermore, the runner chooses the stride. The shoe does not. The runner will more often than not select their preferred motion path that is most effective for them. It is then a matter of finding footwear that best allows the body to succeed on that preferred motion path.
This is oversimplification. The two are coupled. You cannot realistically say that the runner decides how his foot lands regardless of the shoe when a major component of the geometry involved in defining the situation IS the shoe.
rrheisler wrote:
The shoe simply does not cause someone to land somewhere. A runner is going to wind up changing their stride to land in the same place regardless of the footwear because it is their preferred motion path.
Again, as above, an oversimplification. Of course the runner will change their stride based on the shoe, that incidentally, supports my argument, it doesn't rebutt it, but what causes you to assume that this change is in order to land in the same place? Is there evidence of this? Regardless, if you land in the same place it is due to a change in foot angle as I said in my previous post. And that supports my suggestion that the calf is effected, which you rejected. I may be wrong but your position appears inconsistent to me. The implications of one assertion contradict the other.
rrheisler wrote:
You're thinking that the shoe is an input into this system. It's not. The inputs into footwear selection are motion path of the body, physiological limiters, and personal preferences. Drop is but one of those personal preferences that is influenced by a number of factors, most of which surround everyday footwear selection.
This is just a re-statement of the point at issue.
I don't see what you're getting at. Drop is not an input? If you want to state it that way, you're goingto have to clearly define the problem you're trying to solve.
rrheisler wrote:
You're also ignoring that "heel striking" is not inherently bad. There are multiple ways to heel strike. Some are efficient. Others are not.
No I'm not. I'm saying that shoe drop can effect it due to it's implications for the relative positions of the foot and underside of the shoe. I have not said this is good, bad or otherwise. If the bio-mechanics are unchanged, point of contact changes, if bio-mechanics are changed, the shoe geometry effects muscle usage among other things and thus calves etc can require some adaptation, which you have rejected.
So, does heel-toe drop effect bio-mechanics or not?