huh? It seems you're misunderstanding. You're not on your horse demanding higher performance from them during those 23 hrs so you would naturally not need them. I'm not sure how you came to that conclusion. When you are training your horse to jump, you are putting them under more stress. Using the boot 100% of the time you jump means your horse's legs are relying on them -wait for it- 100% of the time. When you go to the show & expect the horse to jump without the support boots, he no longer has that support.
So, for us, we use only use the boots if we are having a long practice. Our horse is developing all of his leg, including tendons, naturally.
Nope, I am not misunderstanding anything as a matter of fact. Horses develop their tendons and muscles naturally while out in pasture, while doing dressage, while out hacking, so when it comes to higher strenuous sports like Jumping, Barrel Racing and etc, etc - our horses muscles and tendons are built up properly, through proper conditioning on a daily basis.
So when we jump, Studdies through Universities and Equine Lameness Veterinarians show, that jumping breaks down our horse joints due to the impaction that occurs when our horses front feet land on the ground. As the saying goes "A horse only has so much jump in them" and that is why Upper Level Riders in North America limit their jumping and focus mainly on proper conditioning on the flat.
So, when using these supposed "supportive" boots when jumping, helps to absorb the shock that our horses front legs absorb naturally when on landing off of a fence, which -wait for it - aids in preserving, preveting and protecting our horses most valuable parts of their bodies...their legs. Not because they are "supportive" but because of how they are designed and the materials that are used.
Studdies show that many boots that are out on the market, do not offer that much in "support", so if that's the case - then how would a horse become dependant on a boot, if studdies show otherwise? Curious.
And in North America - we can use boots when in Jumping Competitions - regardless if it is Jumpers or Eventing.