Momentary And Repeating Force

This photo accurately shows the right front lead leg at the height of the downward arc that will end with the hoof striking the track. Notice the left leg perpendicular to the track carrying most of the weight of the horse at this point.

Again, the height of the front right at this point seems insufficient to me to generate that 12,000 lbs/sq. inch of supposed force on the cannon bone regardless of the muscular strength that slams the hoof to the track surface, but possibly you get that amount of pressure in the short moment when the entire weight of the horse will shift to the front right leg during the follow through of the stride as in the image of the front right (outside horse) below.

I'm thinking the photo catches the black horse above just after the point of maximum pressure on the right front. Notice the right front is the only leg touching the ground. For a short moment that right front carries the entire weight of the horse, and significantly this moment occurs almost simultaneously (just after) the hoof thuds into the track. And so you have the concussive effect of the hoof strike hitting onto the track radiating back up the cannon bone at the exact (or almost exact) moment the entire weight of the horse is coming down from above. It's probably for that 1/2 second when these two forces coming in opposite directions coalesce that the 12,000 lbs./sq. inch. of concussive force on the cannon bone comes into play as supposed .

This process repeats over and over then about 230♦ times in a mile run, and thus on our bone cells and molecules we have a half second of maximum force that is "momentary and repeating".

What effect on the cannon bone? I tried to simulate by striking my arm, palm open, on an air mattress repeating strike after strike. What I noticed is that this striking results in "pressure" on the arm bones, and in particularly pressure on the surface of the bone. So that for our horse and the bone cells we have this interesting sequence:

Momentary + Repeating + Pressure

This understanding might allow us then to conceptualize what happens in this process within the cannon bone in my next post.

Training:
Tues 7/22: riderless fast 3 x 2f all out. Skipped tack work.
Wed. 7/23: Off.
Thurs. 7/24 As I hit the farm the Hurricane Dolly rain was almost upon us. We hustled them out of the pasture hoping to get in some riderless stuff before the skies opened and we accomplished 2 x 6f at a 2 min. clip with some faster spurts. The total volume was over 2 miles but we allowed a rest after the 6f. The rain held off and we got in some tack work: Rod trotted 1/2 mile, Art trotted 1 mile. I like to trot due to rider weight when it's been three days since the last tack work.