The red line is heart rate response, the blue line is velocity of gallop, and the baseline is elapsed time of the workout.
Note the relationship of the red and blue lines, the closer they are together – the better the ability/performance of the horse.
The peak of the blue line is the actual fast half mile portion of this bout. He gets faster as the half mile effort proceeds, what we call ‘finishing strong’.
This 4 year old gelding went on to win 4 of his next 6 races.