Nancy Loving wrote that book and advocates long slow workouts..whereas the studies I mentioned advocate more intense, shorter workouts...both say they do the same thing...
here is a copy, for anyone who cares to read it..about Dr. Nunamaker's study..it is actually quite interesting.
towards the end, One of the trainers comments on how he hasnt had an increase in knee or ankle injuries (both joints) when implementing the short, intense works Dr. Nunamaker advocates...(knee and ankle being the joints most stressed in racehorse training)
As I said, Im not trying to change anyone's minds on this..but there is no "right" and "wrong" answer regarding this..until there is a study that concludes 100%, beyond a doubt that one train of thought is right and the other is wrong, the debate will continue...and everyone will have to make their own INFORMED choice in the matter.
Another article about a new study which is touching on joints and exercise..granted they dont say exactly how much exercise was imposed on said horses in the study..
and one more
from this article
"Hocks are another young horse problem area. Baker says most hock problems tend to become chronic. "It's often a degenerative joint disease in the lower hock joints," Baker explains. "Even as early as yearlings, we see some degenerative arthritis in the bottom hock joints in some young horses. These (problems) should be searched out before the horse even goes into training so the trainer can be aware there's a potential problem. In stifles it's the same thing-- especially in reiners and cutters. There's a high probability of having an injury there. If you start out with subchondral (beneath the cartilage) bone cysts in the joint, or OCD (osteochondritis dissecans), you can expect to have lameness issues before the horse gets very far along in training." "
"Conformation plays a big role in determining whether a horse will develop problems, and which problems he will develop. Splints, for instance, are most common in young horses that have offset cannon bones (bench knees), putting more stress on the inside splint bone. "A horse that's toed out may also get a splints if he interferes, with the foot hitting the splint bone on the opposite leg," says Baker.
"One thing we see in cutters and reiners are back problems such as lumbar muscle strains," Baker continues. "I think this is seen most often in young horses that have the ability to stop hard and back up and turn around. To treat those, you have to break the cycle of pain and tension by relieving the pressure and giving the horse a little rest. There are various ways, such as using anti-inflammatories, muscle injections, acupuncture, muscle relaxants, etc., to relieve the acute nature of this pain." "
These are significant quotes, as I feel they address some aspects to consider when you do start a young horse...
I know I looked at a yearling once..phenomenal lines..she ended up being diagnosed with OCD..could I have maintained her through competition? who knows, but I didnt want to..that is why I feel its important to have young animals throughly checked out if you are putting out the big bucks for them or are planning to invest alot of time and money into their training...or you will end in heartbreak due to their pre-exisiting condition.
bottomline is, you do whats best for you and your horse..:)