Post Race/Breeze Remodeling IX: More Review
The new 2008 Ford F350 on a 500 mile trip over the weekend averaged a very decent 15.6 mpg with help of the manual transmission and a lot of coasting. So, we're back, and now to tedious but necessary horse grunt work. Here is a review Post Race/Breeze Remodeling I-VIII with warning this is quickly typed and technical. I'll attempt a simple, more understandable wrap up next post. This is a shortened summary of how the thought process developed:
I: Nunamaker (Maryland Shin Study): Fracture Resistance (FR) depends on exercise load. Small increases in bone quality,size,density provide geometric additions to strength. "Appropriate" speed exercise "stimulates"(engages) bone remodeling that is "quick" and "immediate".
Speculate that in horses (as compared to humans) this remodeling involves more than osteo/blast/clast remodel.
During the event the mineral lattice compacts/ girds against force. Post event the lattice will rebound from this compaction.
The event also squeezes bone glue proteins against the lattice creating empty micro spaces around the existing glue. (speculation.).
II: Hansma: "Non-collagenous (bone glue) proteins exist as substantial contributors to the overall fracture toughness of bone."
Bone glue possibly is the muck left over from the chemical processes of (bone) collagen formation.
Post event, the micro spacing created by bone glue compaction is filled with more bone glue. This results both due to dilation of capillaries causing material to leak into the spaces, and because the empty spaces create a pressure equilibrium that sucks in the material.
Thus, the empty micro spaces created by event compaction refill. This is estimated to occur by 12-24 hrs. post event.
Estimate the event caused 5% micro spacing which fills in completely with new, additional material within 48 hours!
At 48 hours post event bone glue has returned to pre-event consistency BUT THERE IS MORE OF IT!
III: The event has caused heat build up and compaction. Post event several differing processes engage: inflammatory process, slight molecular and atomic reshaping and rearrangement, dilation of collagen, circulatory system speed up delivery of repair materials and engage repair of micro scarring and cell damage. Fill in of micro spacing with new bone glue, and commencement of osteo cast/blast reconstructive/new construction activity.
PLUS: Rebounding of compacted mineral lattice at cellular level!
IV: Want to conjure a model to provide an idea of post event condition of bone structure.
Inert solids (minerals included) gird and tighten at the atomic level in response to concussive force. Ditto in the mineralized lattice of bone structure.
This compaction works by the branches of the single cell lattice shortening(smashing into) slightly into their calcified connection points. (see illustration in 4/3/09 post.)
Thus, post event, millions of mineralized bone cells are in compacted, tightened, girded condition which creates a "push back" energy from the same millions of cells which subsequently (over time) "rebound" to their original positions.
V: Estimate: 5% mineral lattice contraction during the event and then gradual rebounding post event back to original size and shape over a period of time.
There is also an "inertia" in the opposite direction preventing (or retarding the rate of) bounce back.
Query how long (how much time) it takes for Effect #1 (bone glue) and Effect #2 (mineral lattice compaction) to return to pre-event states. This post estimates 3-5 days for the mineral bounce back and 2-3 weeks for bone glue.
VI: Thus, the "effects" or changes resulting from the event create a temporary increase in bone tissue strength (density).
Now the question of what occurs (what is the effect) of a subsequent speed event e.g. with a 3-5 day period or longer!
Answer: the subsequent event, depending on its timing, will serve to reinforce Effects #1 and 2, bone glue and mineral compaction. i.e. if we send our horse back out in 5 days and do appropriate speed work, the next speed work will serve to keep our lattice compacted, and bone glue pressure high!
Estimate the subsequent speed work needs to be faster than :15s and at least 3f.
The faster and longer the horse goes in this subsequent work, the greater the reinforcing effect.
VII This post surmises that while the greatest mineral lattice rebounding effect is within 3-5 days of the event, there is some rebounding all the way to 8 days out. Thus, if the horse breezes within 7 days of the event there will still be some reinforcing, saving effect.
What is an ideal post event time period for the next speed event--I believe Ivers got it right--4 days out.
Be aware that this covers reasons to breeze again in 4 days. There are significant reasons to avoid this that were omitted from this review post.
Training:
My horses have been working 2.25 miles per day. Will report as this work develops into race prep.
I: Nunamaker (Maryland Shin Study): Fracture Resistance (FR) depends on exercise load. Small increases in bone quality,size,density provide geometric additions to strength. "Appropriate" speed exercise "stimulates"(engages) bone remodeling that is "quick" and "immediate".
Speculate that in horses (as compared to humans) this remodeling involves more than osteo/blast/clast remodel.
During the event the mineral lattice compacts/ girds against force. Post event the lattice will rebound from this compaction.
The event also squeezes bone glue proteins against the lattice creating empty micro spaces around the existing glue. (speculation.).
II: Hansma: "Non-collagenous (bone glue) proteins exist as substantial contributors to the overall fracture toughness of bone."
Bone glue possibly is the muck left over from the chemical processes of (bone) collagen formation.
Post event, the micro spacing created by bone glue compaction is filled with more bone glue. This results both due to dilation of capillaries causing material to leak into the spaces, and because the empty spaces create a pressure equilibrium that sucks in the material.
Thus, the empty micro spaces created by event compaction refill. This is estimated to occur by 12-24 hrs. post event.
Estimate the event caused 5% micro spacing which fills in completely with new, additional material within 48 hours!
At 48 hours post event bone glue has returned to pre-event consistency BUT THERE IS MORE OF IT!
III: The event has caused heat build up and compaction. Post event several differing processes engage: inflammatory process, slight molecular and atomic reshaping and rearrangement, dilation of collagen, circulatory system speed up delivery of repair materials and engage repair of micro scarring and cell damage. Fill in of micro spacing with new bone glue, and commencement of osteo cast/blast reconstructive/new construction activity.
PLUS: Rebounding of compacted mineral lattice at cellular level!
IV: Want to conjure a model to provide an idea of post event condition of bone structure.
Inert solids (minerals included) gird and tighten at the atomic level in response to concussive force. Ditto in the mineralized lattice of bone structure.
This compaction works by the branches of the single cell lattice shortening(smashing into) slightly into their calcified connection points. (see illustration in 4/3/09 post.)
Thus, post event, millions of mineralized bone cells are in compacted, tightened, girded condition which creates a "push back" energy from the same millions of cells which subsequently (over time) "rebound" to their original positions.
V: Estimate: 5% mineral lattice contraction during the event and then gradual rebounding post event back to original size and shape over a period of time.
There is also an "inertia" in the opposite direction preventing (or retarding the rate of) bounce back.
Query how long (how much time) it takes for Effect #1 (bone glue) and Effect #2 (mineral lattice compaction) to return to pre-event states. This post estimates 3-5 days for the mineral bounce back and 2-3 weeks for bone glue.
VI: Thus, the "effects" or changes resulting from the event create a temporary increase in bone tissue strength (density).
Now the question of what occurs (what is the effect) of a subsequent speed event e.g. with a 3-5 day period or longer!
Answer: the subsequent event, depending on its timing, will serve to reinforce Effects #1 and 2, bone glue and mineral compaction. i.e. if we send our horse back out in 5 days and do appropriate speed work, the next speed work will serve to keep our lattice compacted, and bone glue pressure high!
Estimate the subsequent speed work needs to be faster than :15s and at least 3f.
The faster and longer the horse goes in this subsequent work, the greater the reinforcing effect.
VII This post surmises that while the greatest mineral lattice rebounding effect is within 3-5 days of the event, there is some rebounding all the way to 8 days out. Thus, if the horse breezes within 7 days of the event there will still be some reinforcing, saving effect.
What is an ideal post event time period for the next speed event--I believe Ivers got it right--4 days out.
Be aware that this covers reasons to breeze again in 4 days. There are significant reasons to avoid this that were omitted from this review post.
Training:
My horses have been working 2.25 miles per day. Will report as this work develops into race prep.
posted by rather rapid at
8:57 AM
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