Cardiac monitoring during exercise tests in the horse. 3. Changes in the electrocardiogram during and after exercise.

The research study focuses on changes that occur in the equine electrocardiogram (ECG) during and after intense exercise. It found horses with abnormal resting ECGs displayed significantly higher heart rates than normal ones during intense exercise, which could potentially hint towards impaired performance, underlining the importance and potential of exercise ECG.

Cardio Monitoring During Exercise

• The study meticulously examines the alterations in the horse’s electrocardiogram during and after exercise as compared to its resting state. The focus of the study lies in intensive forms of exercise where the pace of motion matches or exceeds the ‘three-quarter pace’ which translates to 200 meters covered in 15 seconds.
• In these instances, it was noted that the high heart rates reached by the horses resulted in a loss of ECG waveforms that were easily discernible at rest.

Comparing Normal and Abnormal ECGs

• On comparing the ECG waveforms of horses with normal resting ECGs and those with abnormal ones, differences were noticed.
• However, the more definitive and significant finding lay in the fact that horses with abnormal resting ECGs displayed significantly higher heart rates during the stated intense exercise than their normal counterparts.

Implications for Racing Performance

• The abnormal resting ECG, in combination with an exercise ECG that showcased low amplitude, broad rounded T waves or transient bursts of sine-waves suggestive of ventricular flutter, predicts a likely impairment in the horse’s racing performance.
• This relationship potentially provides valuable insight for horse trainers and veterinarians in diagnosing and addressing cardiac abnormalities in performance horses.

Future research and Technology

• While the exercise ECG shows significant promise in augmenting our understanding of physical fitness and resting cardiac abnormalities, the technology needs improvement and further research is needed to validate and expand upon these findings.