Microfracture

And so, in "appropriately conditioned bone" (an important distinction) during the breeze while there may be microscopic movement and rearrangement, the end result is bone material primarily unchanged due to its nature and composition.

I questioned this hypothesis, particularly in terms of movement of bone material. Bone seems like really hard stuff. Press in on your own tibia to get my meaning. It's other than rock but its a lot harder than what we'd describe as a semi-solid such as slightly heated plastic. In describing the feel of our tibia, if we use the range between semi-solid in various stages of hardening to a solid like perhaps a diamond, certainly the "hardness" of the bone is somewhere just short of being rock like solid i.e. hard enough that you'd question the concepts of microscopic movement and rearrangement.

And, in this regard it seems the obvious hardness and strength of the near rock hard tibia would withstand the normal forces of a "stride" without microscopic movement of material. HOWEVER when we take our thinking to what happens during the breeze, i.e. 240 strides--as you feel your tibia imagine what happens to the material if you hit it against a brick wall 240 times!. With the idea of repetition of pressure the concept of microscopic movement of material seems fairly easy to visualize even in material as hard as our tibias.

The next question would then be whether during the breeze 100% of this material "reforms" to its original composition, or whether in certain places the material breaks down.
During multiple strides while most of the material would rearrange to the original, would any portions of the lattice, collagen or bone glue be crushed or broken? E.g. at microscopic level would maybe just one supporting section of lattice fracture?

Follow this process in the illustration above from A to F. "A" shows a connected lattic that is gradually undone as you proceed to "B","C" and on. In our bone cell we may think of the possiblity of rupture at any of these stages post breeze.

A microscopic enlargement of an actual bone micro fracture sequence appears below:

We know we're heading for trouble with a "Micro crack" (center illustration), and notice the change in color! But I'm thinking much more relevant is the illustration on the right showing "Diffuse Damage". Continue next post.

Training:
Sat. 8/30: An evening of firsts: Rod for the first time trot-walks all the way around the course. Mostly walk as Rod was balking and inexplicable still throwing his head from the bit, which is one of those expensive Herm Sprenger $125.00 mouth friendly jobs. Rod then galloped riderless slow for 2 miles. Art for the first time went around the course twice 1.75 miles. About a mile of this gallop. Never changed a lead and Nob kept having to bring him to a trot and back track to get the correct lead. Discouraging night--no leads from Art and Rod still throwing his head all over the place even after wolf tooth extraction, but, good news ahead, read on.
Sun. 8/31: Art goes to lead change school. Got to get this down before we develop into an Alydar. Art was galloped over a 2.5f section with a sharp 1/2f curve in an effort to get lead changes. He went 4 times back and forth for about a 1 mile gallop total and was brought to trot-walk with each turn around. Voila, the horse changed leads every time, left to right, and right to left. It was hardly on cue, and he has yet to associate the rein work with the lead change, but, this is coming. With Rod we tried a different bit, and the head throwing largely disappeared. Rod trotted one mile under tack. So, we go from a $125 mouth friendly bit to a cheap $23 jointed very mouth unfriendly snaffle D racing bit and he likes it. This one I've yet to figure.