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Background  Training of Standardbred race horses aims to improve cardiovascular and metabolic functions but studies on the effects of different training strategies from breaking till racing are lacking. Sixteen horses with the goal to race as 3-year-olds were studied from breaking (1-year-olds) to December as 3-year-olds. Horses were allocated to either a control (C) or reduced (R) training program from 2 years of age. The aim was to evaluate the effect of reducing the distance of high intensity exercise by 30% with respect to velocity at lactate concentration 4 mmol/l (V La4 ), blood lactate and cardiovascular response. All training sessions were documented and heart rate (HR) was recorded. A standardized exercise test of 1,600 m was performed 10 times and a V La4  test was performed five times.    Results  C horses initially exercised for a longer time with a HR >180 beats per minute compared to R horses ( P  < 0.05) but after 6–9 months, time with HR >180 bpm decreased in C and were similar in the two groups ( P  > 0.05). Over the 2-year period, recovery HR after the 1,600 m-test decreased in both groups but was within 2 months lower in C than in R ( P  < 0.05). C horses also had lower resting HR as 3-year-olds ( P  < 0.01) than R horses. In C, post exercise hematocrit was higher than in R ( P  < 0.05). There was a tendency ( P  < 0.1) towards a larger aortic diameter in C as 3-year-olds (C: 1.75 ± 0.05, R: 1.70 ± 0.05 cm/100 kg BW). Left ventricle diameter and blood volume (in December as 2-year-olds) did not differ between groups. There were no differences between groups in post exercise blood lactate concentration or in V La4 . Both groups were equally successful in reaching the goal of participation in races.    Conclusions  Horses subjected to a reduced distance of high intensity training from the age of 2 showed an attenuated heart rate response, but were able to maintain the same V La4  and race participation as horses subjected to longer training distances.

Reduced high intensity training distance had no effect on VLa4 but attenuated heart rate response in 2-3-year-old Standardbred horses