Heart and respiratory rates in three horses before and during exercise and recovery. Horses exercised one after the other on a 6450 m long track during five consecutive days according to a pre-determined schedule which included four exercise sessions interrupted by pauses. Treatments were: unclipped (circles), unclipped with blanket during recovery (square), half-clipped (romb), clipped (triangle pointing upwards), and clipped with riding blanket and blanket during recovery (triangle pointing downwards). Hatched lines show onset and end of exercise. A) Heart rate increased at each run (P < 0.001 vs.baseline), and decreased at each pause, but remained elevated (p < 0.01 - 0.001). B) Respiratory rate increased in all treatments (p < 0.05 - 0.001). RR remained elevated in unclipped horses with blanket upon return to the stable and it was higher than in clipped horses (p < 0.001) at that time.