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ThoroEdge Blog
Here you can find daily updates on what ThoroEdge is doing in the field. Specific case studies, our take on current events in the thoroughbred world, and exciting new products/findings are all in here. Please feel free to add your comments as well!-
 Yearling selection based on physiological parameters 
Five yearling heart rates on a mechanical exercise wheel

Five yearings, all born in the same month, exercising at a slow pace for 20 minutes on a mechanical walker at the farm.

The YELLOW line indicates the inferior athlete of the bunch, doing the same level of work as the others, but at a much higher relative intensity. On the other hand, the RED line shows the leader of this group, his internal systems (heart, lungs, blood, muscles, ligaments, etc.) interrelate during exercise more efficiently than the rest.

I am in the process of collecting this data on 100+ yearlings targeted towards the Saratoga Select Yearling sale this fall. Most work will be done behind the scenes at various Lexington area farms.

I will have them ranked from 1 to 100+ based on actual exercise performance during the pre-sales conditioning process over the next few months. This is very valuable information to contribute to your selection process, only available at ThoroEdge.

V200 and racing performance

V200 is the speed achieved with a heart rate of 200bpm, or roughly 85% intensity. This number can be obtained, as seen by the graph to the left, with submaximal exercise intensities between 50-70% in the yearling.

V200 has shown to be remarkably consistent around the world:

age = V200

6 months = 8.51 to 11.93mph

12 months = 9.94 to 13.24mph

18 months = 11.93 to 14.91mph


HRV, or heart rate variability, is a measure of nervous system control over the heart beat, the more influence - the better.
Japanese great T.M. Opera O exhibited tremendous numbers, measured at rest. How do your yearlings compare?

HRV in a top earning Japanese thoroughbred


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    HR/GPS use at private training center:
    "It is not just visual monitoring, there is also the scientific approach. Heart monitors are fitted to every horse and a GPS armband is on every rider. Data is logged, ready for examination."
    JW Race Stables, Louisville, KY
    "My rider feels things I can't see, I see things he can't feel, and we both miss much of what is going on inside the horse."
    Top trainer who wishes to remain anonymous
    "Knowing that I am giving each horse what he/she needs to improve, with a minimal risk of injury, sure helps my piece of mind, as well as my win percentage."