Comparison of exercise variables measured during intensity of simulated training to variables at maximal effort in standardbreds.

This study investigates how heart rate and other physical measurements change during simulated routine training on a treadmill, relative to maximal effort, in a group of active Standardbred race horses. The research indicates that most horses were working at intensities within the accepted guidelines, though some had work intensities that were potentially too low or too high.

Research Goals

• The purpose of this study was to examine the exercise variables during simulated training (ST) and compare these with the variables at maximal effort (MAX) in actively racing Standardbred horses.
• Measuring the heart rate and other parameters during ST would offer insight into the intensity and physiological demands of routine training, and allow for the comparison of these factors with the conditions of maximal effort.

Methods

• The study used a treadmill to simulate routine training conditions for the horses. They also tested the horses at maximal effort on the treadmill.
• The heart rate, running velocity, oxygen consumption, respiratory and stride frequency, and stride length were all recorded during the treadmill work.
• Blood lactate concentrations, a measure of physical exertion and possible muscle fatigue, were also analyzed before and after each workout.

Results

• On average, the horses’ heart rate during ST was about 88% of their maximum heart rate. Only one horse worked below the 80% threshold and two worked above the 90% threshold.
• The mean oxygen consumption during ST was 75.1% of the maximal level. However, there was a weak correlation between oxygen consumption and heart rate for individual horses.
• At similar speeds for both ST and MAX sessions, the only significant difference was the respiratory frequency, which was higher during the ST.

Conclusion

• Most of the horses worked at intensities that were consistent with the recommended guidelines of 80-90% of maximal heart rate. However, for 3 out of 8 horses, the intensity may have been too low or too high, indicating potential issues with the training regimen.
• The findings suggest that while heart rate and oxygen consumption are generally proportional to exercise intensity in horses, individual variations may exist. Further research may be needed to optimize training plans for individual horses according to their physiological assessments.