The WH article was based from a book by Dr. Stephen Peters and Martin Black.
Whether Dr. Peters has published an actual study, I can not say. Perhaps I should see if there is, because you have a good point.
Unfortunately, some folks think of this method as the "miracle cure" and it simply is not. Laying a horse down is no different than anything else done with a horse, there is a chance of injury to either horse or rider and if not done correctly does more harm than good.
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