Nany Loving had a very good article in TB sometime back on the time table
for various parts of the horse to reach top condition.
The way I use the HRM to bring on a new horse is as an upper alarm. I set a
heart rate range say 100 to 120 and condition within that range for a
period of time. There is little reason to have have a high octane engine
when the tires will blow out. One good way to conditon the heart while not
over stressing the legs and joints is up hill and sand. I know there are a
lot of horror stores concerning sand, but sand properly used can be a very
good and safe conditioning tool.
Truman
Truman Prevatt
Sarasota, FL