Summary:The effect of training is the continual improvement of a horse's performance and heart rate is one of the most important indicators in that process. The study proves the hypothesis that a heart rate (HR) analysis during the most important moments of an exercise unit can be useful in everyday training with horses taking part in eventing competitions which require a particularly high training workload from the rider/horse pair. The aim of this paper was to develop a preliminary version of a simple indicator to evaluate the training status of horses prepared for eventing competitions. The research included 16 horses competing in this discipline. It was carried out during a standard exercise unit, at a continuous canter at 450 m/min combined with jumps over cross-country obstacles as the main elements. The HR of horses was measured using telemetry devices. An exercise unit was divided into 25 elements. HR readings were taken during subsequent exercise elements. For the design of the training level indicator, exercise elements demonstrating the highest HR progress during the warm-up, canter and jump phases and the greatest HR decrease during recovery in the trot and the walk phases were selected. To design the indicator the following elements were selected: warm-up: 11-15 minutes of trotting and 16 -20 minutes of trotting; canter: 4 -5 minutes of cantering and jumps 2 and 3; recovery: 2 -3 minutes of trotting and 2 -3 minutes of walking. Research in this area should be continued and at the moment, this can be considered as a pilot study.Keywords: horse, training, eventing, heart rate, status, indicator Citation: Wilk I., Janczarek I., Brzozowska K. (2017) Preliminary study on the design of a training status indicator for eventing horses. Pferdeheilkunde 33, 466-471;