How does exercise intensity and type affect equine distal tarsal subchondral bone thickness?

The research article presents an investigation into how the intensity and type of exercise affect the thickness of the subchondral bone in horse’s distal tarsal joints. Results indicated that different high-intensity exercise were associated with different patterns of subchondral bone thickness across the joints, demonstrating that both exercise intensity and type influence the bone’s response.

Research Hypotheses and Methodology

• The study proposed that the thickness patterns of equine distal tarsal subchondral bone (SCB) are related to the type and intensity of exercise.
• Additionally, the research hypothesized high-intensity exercise leads to location-specific increases in thickness.
• SCB thickness was evaluated using magnetic resonance images of cadaver tarsi obtained from horses with different exercise intensities – low [general purpose (n=20) and horse walker (n=6)] or high [elite competition (n=12), race training (n=15), and treadmill training (n=4)].
• SCB thickness was compared within each exercise group and between different exercise groups.

Findings

• Elite competition and race training groups displayed greater SCB thickness compared to low-intensity exercise groups, but no such difference was observed for the treadmill training group.
• In general-purpose horses, the lateral SCB thickness was uniformly greater than medial.
• Horses exposed to walker exercise had thicker lateral and medial SCB compared to the midline.
• Elite competition exercises resulted in increased SCB thickness of the proximal small tarsal bones medially and the distal bones laterally.
• For race training and treadmill training, negligible differences were noted between sites, though some difference existed between lateral, medial, and the midline for race training.

Conclusion

• The research concludes that various types of high-intensity exercise are correlated with different SCB thickness patterns across joints from medial to lateral and proximal to distal. This indicates that both the intensity and type of exercise can impact the SCB response within the equine distal tarsal joints.